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switch sim/test: why higher rf pwr gets better ip3
ip3 is supposed to be a weak function versus power level as long as we have enough backup from the compression. but i see in both simulation and test that actually the ip3 gets better with higher two tone power.ive tried simulation on sige and gaas p...
RF, Microwave, Antennas and Optics :: 23 Sep 2009 14:58 :: kspalla :: Replies: 1 :: Views: 159
how to generate a high-precision sine source for ad test?
i need to test a 16bits adc, but i dont have the proper sine source?is there any idea?...
Analog Circuit Design :: 07 Sep 2009 9:17 :: dmilosd :: Replies: 15 :: Views: 1056
fm transmission help needed
hello alli have a modelship wich i want to keep in the range of 5-10meters from an fake island in a pond/pool. i think i need to build an fm transmitter to place on the island and a receiver to place on my boat. the boat has a constant speed, wich i ...
Hobby Circuits and Small Projects Problems :: 10 Jul 2009 2:13 :: Audioguru :: Replies: 9 :: Views: 737
help with designing wireless switch
hey everyone,ive searched around the internet for what im trying to do and im hoping someone here can help me. what im trying to design is a wireless switch. close a switch at point a and that causes a switch at point b to close - this being used a...
RF, Microwave, Antennas and Optics :: 08 Jul 2009 10:32 :: kevin360 :: Replies: 2 :: Views: 222
rf switch in 13.56mhz
hi,all.i used a power switch at the front of 13.56m transmitter,but the effect is very bad,the switch module is macom masw-007813 and some voltage control circuit,datasheet claims operating range is dc-3g,i previously used it very well in 915m rfid r...
RF, Microwave, Antennas and Optics :: 13 Jun 2009 10:19 :: FvM :: Replies: 9 :: Views: 534
need help, check my circuit
hi every one,i am designing a stepper motor controller using 8051 microcontroller, my ckt is not working (stepper motor is not running), i am using unipolar 6 wire stepper motor. i don know where the problem is.this is my code: name stepper_motor ...
Microcontrollers :: 28 May 2009 7:25 :: pranam77 :: Replies: 6 :: Views: 447
433 mhz rec and transmit problem
dear friends.i m doing a project on transmitting a temperature data ( in the form of voltage)through readily available tx and rx. modules of 433mhz. pair.my question is -- is the encoder and decoder chips are must at both the ends of rx and tx ..?w...
RF, Microwave, Antennas and Optics :: 12 May 2009 12:46 :: vfone :: Replies: 2 :: Views: 387
simple fm transmitter
hi ! lately iv made a very simple fm transmitter.http://www.aaroncake.net/circuits/fmtrans2.gifmore info:http://www.aaroncake.net/circuits/fmtrans.aspso the reson i made this post is that its working badly. as u see there are 2 inductors and i made t...
Hobby Circuits and Small Projects Problems :: 23 Apr 2009 18:25 :: zlatkoMM :: Replies: 9 :: Views: 2319
help in fdtd(gaussian pulse)
how to select t0 and spread for gaussian pulse when calculating fields using fdtd for an antenna.................
RF, Microwave, Antennas and Optics :: 23 Apr 2009 8:27 :: demian1977 :: Replies: 1 :: Views: 258
having problem combining lna, mixer & vco
im doing a design of front end of rf receiver. i have designed the lna, mixer and vco according to my own value by referring to the tutorial from rfic.co.uk. the tutorials are cmos gilbert cell mixer, cmos common source lna and lc oscillator tutorial...
RF, Microwave, Antennas and Optics :: 12 Apr 2009 1:04 :: adeel1314 :: Replies: 22 :: Views: 1569
microstrip line & envelope simulation
hii would like to get your opinion about the result and accuracy of envelope simulation of microstrip lines. is it allowed or not?hb is ok regards to simulation with microstrip lines but envelope...?thanks in advance for your helphttp://images.elektr...
RF, Microwave, Antennas and Optics :: 09 Apr 2009 19:01 :: VSWR :: Replies: 5 :: Views: 597
380mhz~400mhz/25w(at)p-1db pa? which rf transistor?
i have designed a narrowband pa of 380mhz~400mhz/25w using the transistor mrf15035 from freescale. but the testing result show that the imd3 is only -13dbc ,(the tesing condition is : 41dbm each tone and the spacing is 100khz). so the linearity is to...
RF, Microwave, Antennas and Optics :: 17 Feb 2009 19:59 :: vfone :: Replies: 7 :: Views: 192
how to estimate the linearity of rf transformer??
if adding a rf transformer as tc1.5-1(mini-circuits) at the output of a amplifier,how to estimate the linearity of it? supose the output is 12channel +2dbm/channel specs of tc1.5-1 maximum rf power 0.25w ...
RF, Microwave, Antennas and Optics :: 05 Jan 2009 2:55 :: fnx7 :: Replies: 9 :: Views: 354
imd problem with a rf amplifier and very linear supposed trt
hello to all,im trying to desing a vhf amplifier for ose ofdm modulation, before apliyying predistortion techniques i have to improve the linearity the best possible. i was tried these 2 transistor from freescale (with well knowledge of efficiency vs...
RF, Microwave, Antennas and Optics :: 06 Dec 2008 4:20 :: fjstuden :: Replies: 8 :: Views: 1137
rf & modulation
one thing still confuse me. how different audio frequency at a same time modulate single carrier frequency. i mean a 100mhz fm transmitter is broadcasting music, music contains audio frequency from 1khz to 18khz, so my question is how a multiple audi...
RF, Microwave, Antennas and Optics :: 13 Sep 2008 3:51 :: Code Warrior :: Replies: 7 :: Views: 384
testing the receiver of transceiver chip.
hi! everybody!!i have to test the receiver chin of zigbee based transceiver.the input being lna inputs and output the form adc.i also have a output pin in the chip form the filter which is placed after the down conversion mixer.please let me know wah...
RF, Microwave, Antennas and Optics :: 08 May 2008 5:38 :: Mazz :: Replies: 12 :: Views: 516
300 points for good idea
hi friends, i am doing a project wireless text messaging using mobile/landline phonesoftware:the msg.asm program is written in assembly language and compiled using metalink asm51 cross-compiler.hardware:1. there are 2 mobiles used one at the transmit...
Microcontrollers :: 03 May 2008 8:38 :: zuisti :: Replies: 4 :: Views: 1065
mixer iip2 simulation
how to simulate for iip2 for my mixer (zero if receiver architecture)??thanks....
RF, Microwave, Antennas and Optics :: 03 Apr 2008 8:56 :: imar :: Replies: 3 :: Views: 297
cmos down conversion mixer
i want to know the design procedure for cmos mixer ,if anyone has any idea please help me..........
Analog Circuit Design :: 02 Apr 2008 20:59 :: chintalaudaykumar :: Replies: 13 :: Views: 453
vco+divider chain simulation
i am using spectre rf to simulate a vco followed by a divide chain but it is painstakingly slow.initially, i had two separate designs:1. 40ghz vco followed by divide-by-2 ilfd (generating 20 ghz output)2. divide by 16 based on dffsboth of these desig...
RF, Microwave, Antennas and Optics :: 01 Apr 2008 16:12 :: pancho_hideboo :: Replies: 4 :: Views: 330
mixer hb noise simulation problem?
hi guys i am doing a noise simulation of mixer in hb simulator, it reports following warning and the report nfssb is zero which is obvious wrong, here is my noise simulation setting, i enable nonliear noise ,choose noise voltage/or noise figure, si...
RF, Microwave, Antennas and Optics :: 26 Mar 2008 8:19 :: khouly :: Replies: 2 :: Views: 258
iip3 measurement_two tone analysis
hello friens,i am working on bluetooth front end design. i want to measure iip3 by two tone method. bluetooth frequency range is 2.40ghz to 2.48ghz.which two tone i should take for linearity(iip3) analysis....
RF, Microwave, Antennas and Optics :: 21 Feb 2008 11:36 :: vfone :: Replies: 6 :: Views: 180
budget analysis in ads for i-q path in rf receiver
hi all,how to get budget analysis in ads when there are two path in receiver(i & q).thanksvivek...
RF, Microwave, Antennas and Optics :: 09 Feb 2008 17:11 :: vivek1214 :: Replies: 13 :: Views: 463
precoded ofdm....
dear alli need the thesis of, “spectrally precoded ofdm”. author – char-dir chungplease help me ………...
Digital communication :: 18 Jan 2008 12:37 :: vkekk :: Replies: 2 :: Views: 296
how to define iip3 of this system?
hi all, i am designing a direct-conversion receiver for uhf rfid reader but with some confused question about how to define iip3 of such a system. this application defines 250khz for each channel while a large blocksignal(say -15dbm) centered a...
RF, Microwave, Antennas and Optics :: 28 Dec 2007 11:07 :: fanshuo :: Replies: 5 :: Views: 311
rms detector and log detector
what is the difference between rms detector and log detector?when we use them(each of them)?...
RF, Microwave, Antennas and Optics :: 08 Nov 2007 15:06 :: madengr :: Replies: 1 :: Views: 393
mixer iip2
can any one suggest me how to simulate for mixer iip2 using spectrerf??it is very confusing me in choosing the second harmonic.thank you....
RF, Microwave, Antennas and Optics :: 28 Oct 2007 10:23 :: hilpp :: Replies: 9 :: Views: 1008
help needed to design a class f power amplifier for linc tx
hello to all,i am very new to rf designing and i am a student... i am designing a class f pa for linc tx(outphasing transmitter), i am using cadence spectra tool to design pa and i have couple of questions...1. how to simulate the envelope simulation...
RF, Microwave, Antennas and Optics :: 21 Oct 2007 17:04 :: akrathi :: Replies: 0 :: Views: 258
what value for order and maxorder in hb simulation?
ads2004a => designguide => mixer => single-end mixer characterization => 2nd- and 3rd-order imd and conv. gain example,hb simulation controller is set up as following:maxorder=6freqorderordersampleth tone in the circuit.can k1 be not integer? or why ...
RF, Microwave, Antennas and Optics :: 04 Oct 2007 3:22 :: asb1211 :: Replies: 1 :: Views: 201
multi-tone signal sources
i have design a logamp simulated with single tone source as input signal (ads software).logamp is originally a peak detector used for continuous wave rf power measurement.i wonder, in case input signal is multi cariers or others (cdma, wcdma, edge, g...
RF, Microwave, Antennas and Optics :: 16 Aug 2007 7:56 :: asb1211 :: Replies: 7 :: Views: 306
anybody know about the mod$$t simulation of e1do rf?
hi,im studying the mod$$t simulaiton of e1do rf, theres a question,is it possible to run co-sim with eldo and eldo rf? that is to co-sim some rf block(in spice) running in sst simulaiton and some analog block(spice) running in tran?...
Software Problems, Hints and Reviews :: 18 Jun 2007 21:17 :: cqmyg5 :: Replies: 6 :: Views: 255
how to simulate the noise in time domain
i noticed some designers say they simulate the receiver noise, e.g. 400uv, how do they get that num, i mean, with lna, mixer, pll, and even the adc? i guess they use the transcient to simulate that noise, but how to get the noise in transcient?...
RF, Microwave, Antennas and Optics :: 09 Feb 2007 19:39 :: Mazz :: Replies: 11 :: Views: 513
sound detection using rf receiver?
final year year project.i was assigned to detect a sound origin in a closed room. i have to develop a device, which is able to detect the sound origin outside that closed room. the sound source (mono-tone) is from a normal sound generator, with a kno...
RF, Microwave, Antennas and Optics :: 13 Jan 2007 9:53 :: akedar :: Replies: 2 :: Views: 129
question about ads linearization design guide
i have some questions about ads linearization/digital predistortion (analog/rf) / step by step design :step1: csrc4 and csrc6 both have five coefficients (alpha_3rd,alpha_5th,....,beta_3rd,beta_5th,....)whats the theoritical base for it? why do this ...
RF, Microwave, Antennas and Optics :: 19 Oct 2006 15:48 :: drabos :: Replies: 0 :: Views: 105
rf receiver input matching
i am measuring the rf receiver without any input matching and see a very noisy downconverted signal instead of a single tone. is the circuit oscillating? how do i determine whether the circuit is oscillating or not?thanks...
RF, Microwave, Antennas and Optics :: 18 Oct 2006 13:21 :: vfone :: Replies: 6 :: Views: 321
modem and broadband
can anyone explain me how internet works that is how broadband services work and why does broadband connection requires a special router and wheras dial up connection uses a 52kbps modem why so and how modem factor changes plz help...
Electronic Elementary Questions :: 08 Aug 2006 10:46 :: mmike :: Replies: 8 :: Views: 1095
2 tone test ...mixer
helloi want to run 2 tone test by qpss ,where to combine the 2 nd tone by qpac or pacif qpac what to write in the sidebands field ...?maximum clock range or select from range or array of cpeffecient ...?please give a complete numbers test..exampl...
Analog IC Design & Layout :: 12 Jul 2006 21:10 :: elbadry :: Replies: 1 :: Views: 123
linearity in mixer..?
hi can any one tell me what control linearity in mixer specially the folded gilbert cellwhat parameter i have to improve iip3..?is there another thing rather than current ?if so what current should increase in transconductance stage or in switching p...
Analog IC Design & Layout :: 05 Jul 2006 14:32 :: Hooda :: Replies: 11 :: Views: 456
power amp harmonics
er amp. my understanding is that the fundamental signal applied will increase linearly (in a non-saturated amp). is this also true of the 2nd harmonic (assuming a wide band amplifier)? i know the two-tone intermods have 2/3 db increase for each db of...
RF, Microwave, Antennas and Optics :: 27 Jun 2006 6:02 :: icfarmer :: Replies: 5 :: Views: 288
mixer question
hi ;to design a mixer on spectre rf,i made 2 tone test by pss with single tone & combining the other one by pac ---> it results in a very broken curve & 3rd order curve became upper then 1st order curve is there a better way to show the famous iip...
Analog Circuit Design :: 19 Jun 2006 23:55 :: aomeen :: Replies: 2 :: Views: 222
ip3 of pa
pa tuning now and was surprised by the oip3 of this device. the lower side ip3 (899mhz) and higher side one(902mhz) could be as much as 10db different, as the output power level changes. here i use 2 tone input with 1mhz spacing as the input to the p...
RF, Microwave, Antennas and Optics :: 10 Jun 2006 10:58 :: vfone :: Replies: 8 :: Views: 411
doppler ultrasound blood flow detector???????
well i build a blood flow detector and i really like know about more about this like circuit rf amplifier, mixer, demodulator detector, audio amplifier etc?? i really appreciate any information that u have!!! but more about the mixer if i can use a ...
Other Design :: 19 May 2006 11:14 :: Mike zhang :: Replies: 62 :: Views: 18851
project help in rf range finder
hello friendsi am doing my final year project i.e rf range finder based on fm bandthis device tells us direction,location and approx range of fm radio station that is tuned on our fm tunernow i want to interface it on my laptop.for this i have to use...
RF, Microwave, Antennas and Optics :: 29 Apr 2006 1:37 :: throwaway18 :: Replies: 3 :: Views: 168
about the mixer conversion gain with sinwave lo drive
in this paper:http://smirc.stanford.edu/papers/jssc97dec-arvin.pdfin the middle of page 2066, they said:for a sinusoidal drive, |m(flo)|=1/2, .... the gain a is pi/2. the the conversion gain for sin lo drive is pi/4(-21.db). can sb. explain more deta...
Analog Circuit Design :: 14 Apr 2006 18:09 :: lijulia :: Replies: 1 :: Views: 132
rf system architechture???
question 1:showing the block diagram (as detailed as possible) of a am-usb receiver, working frequency of 1050khz.question 2:showing the block diagram of a fm los station with baseband frequency at input and output for fsk voice communication. the fi...
RF, Microwave, Antennas and Optics :: 14 Feb 2006 1:30 :: zhangjavier :: Replies: 2 :: Views: 408
on-wafer measurements in a mixer
i am doing a down-converter mixer as project at school, and will perform on-wafer measurements (in order to keep signal integrity) of a gilbert mixer cell, like two-tone test and output spectrum. i do not have experience with this kind of tests. the ...
RF, Microwave, Antennas and Optics :: 21 Jan 2006 2:54 :: STOIKOV :: Replies: 0 :: Views: 105
[help] mixer design
hi.. im a undergraduate student and now im working on designing a downconvert mixer for my project. for the purpose of learning, im working on single balanced mixer. i have the circuit. but i really dont no how to bias it and determine suitable w/l r...
RF, Microwave, Antennas and Optics :: 03 Jan 2006 7:49 :: evilguy :: Replies: 17 :: Views: 1239
rf bridge functionality ????
im using the rf bridge to combine 2 signal source for toi measurement. anyhow, would like to know is there any others alternative way to combine 2 signal source with a good isolate btw 2 port. need help !!!...
RF, Microwave, Antennas and Optics :: 21 Dec 2005 10:30 :: koontlim :: Replies: 3 :: Views: 435
designing a wideband receiver ?
can i design a system that can do the following job?it monitors a signal which1. has variable power (i am not sure the power level at this moment)2. has frequency from 1ghz to 6ghz (the freq is specified by the user)the signal is down convered to if ...
RF, Microwave, Antennas and Optics :: 13 Dec 2005 3:54 :: yolande_yj :: Replies: 5 :: Views: 327
theramin circuit
does anyone have a schematic for a simple theramin (musical instrument)? i want to make one for a christmas present, but all the schematics i find online are a little too complicated to throw together in one afternoon....
Analog Circuit Design :: 13 Dec 2005 0:30 :: artem :: Replies: 3 :: Views: 255
wireless headphones
most of u will know a wireless headphones has a transmitter and a receiver...any radio receiver can be used as the reciever only that it needs to tune in to the frequency of the transmitter....am trying to build a transmitter to transmit at some freq...
Electronic Elementary Questions :: 04 Dec 2005 17:03 :: ramy gad :: Replies: 15 :: Views: 622
low-cost rf power measurement using shottky diodes
id need to develop a power detector for level between -70dbm up to 0dbm and a frequency range from 5mhz to 20mhz.any idea? full-wave rectifier but which diode? how to improve sensitivity?...
RF, Microwave, Antennas and Optics :: 29 Oct 2005 10:44 :: jabidof :: Replies: 5 :: Views: 372
help! targets in designing amplifier with @ds!
i am a freshman in rf field.recently i am studying the amplifier, and i am comfused in what targets we want to get in designing with @ds. we know power gain, noise figure and output power are needed, but my question is other coefficients such as harn...
RF, Microwave, Antennas and Optics :: 27 Oct 2005 8:07 :: yelso :: Replies: 8 :: Views: 324
possible to have the iip3 point < p-1db point?
when i simulate a resistive fet mixer. the iip3 points seems to be lower than the 1 db compression point, p-1db is this possible?i do the simulations in @ds. the results also seems to be hardly dependent on the maximumorder. therefore i have increase...
RF, Microwave, Antennas and Optics :: 10 Oct 2005 21:48 :: joakim :: Replies: 4 :: Views: 246
hspice can ben used for rf circuits design?
is it good software for rf circuit?...
Analog Circuit Design :: 18 Aug 2005 5:03 :: hr_rezaee :: Replies: 9 :: Views: 954
iip3 @ 10mhz offset for wcdma
the inband iip3 for wcdma is specified @ 10mhz offset. so i ran a 2-tone test w/ following parameters, rf1=2150mhzrf2=2160mhzlo=2140mhz first of all, should i have used the 2 tones @ 10/20.5mhz so that im3(0.5mhz) falls within the bw(5mhz)? secondly,...
RF, Microwave, Antennas and Optics :: 12 Aug 2005 6:42 :: boshiouke :: Replies: 4 :: Views: 222
hbfree - freeware harmonic balance simulator download
: freewarehttp://www.edaboard.com/files-eboard/na.jpgharmonic balance simulator hbfree is intended for simulation of radio frequency (rf) and microwave (mw) analog non-autonomous circuits under multi-tone excitations. it was developed for mw mixers a...
Software Downloads/Uploads :: 13 Jun 2005 18:43 :: Fairgrounds :: Replies: 0 :: Views: 12
mixer testing
i wish to test mixer at s band how can i determine that it work satisfactorily what necessrary devices i must need to perform the test...
RF, Microwave, Antennas and Optics :: 10 Jun 2005 10:16 :: ommumm :: Replies: 2 :: Views: 186
troubling in mixer design?
i am troubling in mixer design?in fet resitance mixer design process(only vgs apply on gate):tone 1 applied to port2 defines the lo frequency and swept power(11.5ghz,14.9dbm,the power level should be optimized).tone 2 applied to port1 defines the rf ...
RF, Microwave, Antennas and Optics :: 24 May 2005 2:09 :: wjnbry :: Replies: 0 :: Views: 186
ip3 in cadence
i am using spectre rf for a mixer design. when i use a two tone test to get the ip2 (using swept qpss) i usually get a very large difference between the 1db compression point and the ip3.according to theory, ip3=p1db+9.6 dbhowever i get difference as...
Software Problems, Hints and Reviews :: 20 May 2005 0:24 :: elbadry :: Replies: 0 :: Views: 273
who has achieved hb simulation for down-converter in ads?
th a down-converter which only included a lna, a mixer and a vco, the rf input is 2450mhz, the lo frequency will be the ouput of vco in hb simulation. theres some difficults to achieved it:if i use 1 tone hb and oscport for vco oscillation, how to pe...
RF, Microwave, Antennas and Optics :: 14 May 2005 5:59 :: cqmyg5 :: Replies: 6 :: Views: 189
analog catv design
hi all;i want to know about designing an analog catv (cable television) and its important parameters....
RF, Microwave, Antennas and Optics :: 09 May 2005 12:17 :: m229 :: Replies: 9 :: Views: 468
rf logic transmitter and receiver circuit?
im looking for a rf circuit that could transmit a logic 1 to receiver that then would activate a relay. the range between the trans. and receiv. can be about 3-10ft. thanks for your help....
Hobby Circuits and Small Projects Problems :: 08 Apr 2005 14:57 :: artem :: Replies: 7 :: Views: 1935
433 mhz module
i have a 433mhz receiver module, some pins are connected to 5v and gnd, one of those pins is the output, i have connected this pin to an oscilloscope and only i can see noise. how can i eliminate this noise, i want to see the code of a garage control...
RF, Microwave, Antennas and Optics :: 06 Apr 2005 15:24 :: cmosbjt :: Replies: 2 :: Views: 237
oip3 & op1db
hi guys:i have a doubt here. when it is mentioned in the journals that the performance of the active mixer results in an oip3=18dbm and op1db=8dbm, respectively. are they referring to the modulus value of it, since i find it quite difficult in obtain...
RF, Microwave, Antennas and Optics :: 24 Mar 2005 2:17 :: cmosbjt :: Replies: 15 :: Views: 1476
self-oscillating mixer simulation
hi,how do you test for conversion gain of a self-oscillating mixer (som) in ads? harmonic balance sim is used? how?also, all som are suppose to give conversion gain right? :) i have lo = 4ghz and rf = 4mhz, if is to be 4.4ghz or 3.6ghz.thanks!...
RF, Microwave, Antennas and Optics :: 07 Mar 2005 1:48 :: gecky :: Replies: 10 :: Views: 426
matching question (..imped from load pull analysis)
hello from a new member. at first i would like to send my congratulations about the forum! (please forgive me about my english).i am trying to make a tranceiver design based on chipcon cc1020 at 868mhz ism band. due to many reasons i must not follow ...
RF, Microwave, Antennas and Optics :: 13 Jan 2005 1:14 :: mixaloybas :: Replies: 2 :: Views: 471
book! name:radio frequency circuit design
w. alan davisuniversity of texas at arlingtonkrishna agarwalraytheon systems company,contentspreface xiii1 communication channel 11.1 basic transmitter–receiver configuration 11.2 information and capacity 31.3 dependent states 6problems 8references 8...
RF, Microwave, Antennas and Optics :: 07 Jan 2005 9:47 :: vfone :: Replies: 1 :: Views: 855
simple questions about rf amplifiers (ip3 and p1db)..
hellowhat does it means the following amplifier specification ?out put p1db , output ip3 ?example :in the datasheet they sayp1db = +30 dbm , ip3 = +46 dbm ??the gain of the amp is 14 db ????im totally lost .. what i understand is when i input po...
RF, Microwave, Antennas and Optics :: 04 Jan 2005 17:40 :: qyinn :: Replies: 11 :: Views: 762
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control automations and security system by pic
im totally a fresh newbie in pic and i also never learn pic before, i hope all the forumers here can help me and let me know wat should i do 1st.... thanx!!!!!i now doing for my degree final year project. the project is need to design a telephone con...
Microcontrollers :: 16 Dec 2004 14:31 :: Mr_Programmer :: Replies: 7 :: Views: 795
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