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dds help
anyone please help . tell me the step to come out with dds 120 mhz 8 bit please help...
PLD, SPLD, GAL, CPLD, FPGA Design :: 12 Nov 2009 21:25 :: senior :: Replies: 30 :: Views: 1894
digitally programmable audio tone generator chip
colleagues,are there programmable tone generator ics out there? it would have a digital interface to a microcontroller (e.g. i2c). through this interface the controller could set a tone and volume. the output would go to a fixed-gain audio amp and...
Microcontrollers :: 30 Aug 2009 10:29 :: FvM :: Replies: 4 :: Views: 375
rf oscillator 4-120mhz
hello,in the context of a project i need a schematic for a 4-120mhz oscillator, being vco or l/c, pll or whatever. i need 4-120mhz but also something like 10-120mhz would be fine.any ideas please?...
RF, Microwave, Antennas and Optics :: 28 Aug 2009 12:08 :: FvM :: Replies: 10 :: Views: 613
how to i generate a digital controlled 0-5v analog signal.
hello, i am trying to build a circuit that can output a 0-5v analog signal.this analog signal will be controlled by a mcu.what i have in mind is to have a mcu communicate to some sort of 12bit dac.i am familiar with the mcu portion of things, but i a...
Hobby Circuits and Small Projects Problems :: 27 Aug 2009 10:30 :: Petre Petrov :: Replies: 8 :: Views: 846
i need help for pic 16f877 about sine generator
i have a projecti have to produce 3 sin wave with phase 120 difference bu using 16f877.the frequency of this sin wave must be adjustable between 2-110 hzi used a potentiometer to adjust the frequency and 3 adc to acquire output voltageand finally i ...
Microcontrollers :: 10 May 2009 20:27 :: chatwitdebo :: Replies: 5 :: Views: 1011
need to write a program in c that outputs a sin wave
i need to write a program in c that outputs a sin wave, were i can change the frequency. any suggestions??...
Microcontrollers :: 02 May 2009 11:58 :: trekkytekky :: Replies: 4 :: Views: 405
digital communication
i need matlab programs of ask,bpsk,fsk,dpsk,qpsk etc. of digital communications....
Digital communication :: 15 Mar 2009 15:26 :: Communications_Engineer :: Replies: 14 :: Views: 1137
req: antenna pattern synthesis: orchard method
hi friends,some days ago i placed a request in the “eda e-book, articles & specification requests” forum and there wasn’t any reply. now i think this forum is a better place for my request.im looking for information on the orchard technique for patte...
RF, Microwave, Antennas and Optics :: 18 Jan 2009 12:48 :: juppydu :: Replies: 48 :: Views: 7341
fixed clock generator using phase accumulator
ritten for calculating parameters of phase accumulator in order to create a clock with given frequency. the idea of using phase accumulator for this task is taken from an analog devices article about direct digital synthesis - the article can be foun...
PLD, SPLD, GAL, CPLD, FPGA Design :: 01 Nov 2008 9:59 :: firefoxPL :: Replies: 3 :: Views: 570
variable sinewave generator using 12 bit dac
hi, i want to generate the a varaible sinewave from 10hz to 50khz using 8 bit microcontroller and and 12 bit dac.i have read from the articles that from a look up table you can generate thefixed frewuency sinewave,but if i want to change the f...
Microcontrollers :: 15 Aug 2008 6:22 :: FvM :: Replies: 5 :: Views: 936
waveform generation using pwm technique
i wud b glad if anyboby cud help me in providin a solution 2 dis querry of mine..m using atmega 8l for making a function generator..dere m usin pwm technique for generatin sin(4m luk up table),square and a ramp wave..i hv managed to develop all d 3,b...
Microcontrollers :: 26 May 2008 16:36 :: SWETA :: Replies: 15 :: Views: 831
regarding nco (numerically controlled oscillator)
hi all , i need to design nco( numerically controlled oscillator) by using look up tables. i dont have any idea how to store the data in lut and access the same. currently i am working with dsp processor, i need to develope this using c. can any one ...
Digital Signal Processing :: 28 Apr 2008 19:45 :: mowgli :: Replies: 7 :: Views: 690
avr archive
atmel application archivehttp://rapidshare.com/files/13831436/avr.zippass: groovysample photoshttp://img100.imageshack.us/img100/5118/00br9.th.jpghttp://img100.imageshack.us/img100/3594/01mz7.th.jpghttp://img142.imageshack.us/img142/7141/02fl3.th.jpg...
Microcontrollers :: 21 Mar 2008 19:00 :: blueroomelectronics :: Replies: 21 :: Views: 5685
not able to generate sine wave using dds in simulink
the diagram below shows my design to generate a sine wave ... but its not generating it .... help needed http://i51.photobucket.com/albums/f400/its_me_the_great3/dds.jpgis there any need to create a lookup table inside the dds block .. or its there b...
PLD, SPLD, GAL, CPLD, FPGA Design :: 15 Mar 2008 12:27 :: r_a_c_a_4_u :: Replies: 1 :: Views: 327
frequency divider
how to buid a divide by 15.6 frequency divider ?...
Analog Circuit Design :: 18 Jan 2008 10:10 :: master_picengineer :: Replies: 5 :: Views: 311
who have implement digital sin waveform generator ?
give me some advice...
Microcontrollers :: 14 Nov 2007 13:53 :: mohamed fawzy :: Replies: 10 :: Views: 2459
anyone know how dac work
anyone got the pic of how dac work i know is digital-to-analog converter but how is it work inside ??...
PLD, SPLD, GAL, CPLD, FPGA Design :: 12 Nov 2007 16:26 :: angu :: Replies: 4 :: Views: 405
fyp help...dual port block memory~~
i need to pump in a sine wave using a dds.....so i can juz put sine = din right??but how can i store the values in the address??can some1 explain to mi?...
PLD, SPLD, GAL, CPLD, FPGA Design :: 10 Oct 2007 4:42 :: cloudz88 :: Replies: 22 :: Views: 494
spi on avr to generate a square signal
hello,i want to use spi as master on atmega8 clocked at 16mhz to generate a fast square signal on mosi - not for data transmission, but for signal generation. to do this i configure spi as master at 2mb/s and write the 8 signal samples in spdr regist...
Microcontrollers :: 15 Aug 2007 18:25 :: Eugen_E :: Replies: 1 :: Views: 210
req... design of direct digital synthesizer
hi friends!!!can anyone help me out in design of direct digitalsynthesis. here i need to implement phase accumulator and rominside the cpld. the output of the cpld is given to the dac.the input to the phase accumulator is 1. the frequency word ...
PLD, SPLD, GAL, CPLD, FPGA Design :: 07 Aug 2007 8:32 :: raju_tawade :: Replies: 3 :: Views: 612
sige
hello why sige process is always used in rf technologya+...
Analog IC Design & Layout :: 26 Jul 2007 3:43 :: psmon :: Replies: 5 :: Views: 228
please help me to answer the three questions correctly.
hi, i have the three questions about ic design? 1.what are the different for pre- and post- synthesis? 2.what is sdf file? 3what is tcl file? i will appreciate you,thank you!...
Electronic Elementary Questions :: 08 May 2007 10:54 :: vicky :: Replies: 1 :: Views: 201
digital frequency synthesizer
hi, can anyone send me a link of book or tutorial on digital frequency synthesizer.mail id is rmansal@gmail.comthanks in advance...
ASIC Design Methodologies & Tools (Digital) :: 19 Mar 2007 23:14 :: tlihu :: Replies: 6 :: Views: 1380
pwm
hi,can any one tell what is pwm? and its application...
Electronic Elementary Questions :: 03 Mar 2007 8:17 :: sonal :: Replies: 9 :: Views: 810
analog pll vs digital pll
hi, what is the differnce between analog pll and a digital pll.is this only regarding the use of xor gate as phase/frequecy detector in digital pll and we use charge pumped pfd in analog pllthanksshaikh sarfraz...
Analog Circuit Design :: 17 Dec 2006 21:38 :: willywalker :: Replies: 8 :: Views: 786
sinewave generator!
how can i produce sinewave using integrator???frequency range: 0.1hz -> 200 hzthank you beforehand!...
Analog Circuit Design :: 25 Oct 2006 6:48 :: echo47 :: Replies: 27 :: Views: 3606
kit for dsp on fpga
hi,im trying to find kit for reaserch in subject: dsp on fpga. i have some expierience with signal processors, but fpga is new for me. ive looked on xilinx and altera sites and kits which are interesting for me are:dsp development kit, stratix editio...
PLD, SPLD, GAL, CPLD, FPGA Design :: 11 Oct 2006 8:00 :: kawish :: Replies: 8 :: Views: 764
docs...
* adcs * antennas * cad/cae * cdma * cellular * clock generator ics * dds: direct digital synthesis * design topics * digital signal processing * fcc stuff * frequency allocation * ieee 802.11 * indoor propagation ...
Other Design :: 10 Oct 2006 12:08 :: i_am_here :: Replies: 1 :: Views: 471
how to make a dds model using matlab or system view?
hello,everyone! im studying about direct digital synthesizer,i want to simulate a dds using matlab or system view. but i feel its not easy to make model, so id like to know how to make a dds model. thank you !...
Software Problems, Hints and Reviews :: 25 Aug 2006 13:21 :: okguy :: Replies: 8 :: Views: 1185
ADS
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variable frequency
hii am interested to develop algorithm to generate sine wave at different range of frequency for my microcontroller. does anyone know how to do it or know the link for me to look up?please let me know asap kind regardsmaverick max...
Microcontrollers :: 17 Jul 2006 9:36 :: Alan69 :: Replies: 16 :: Views: 792
pic-based signal generator --- help! ^__^
we are a group trying to create a pic-based signal generator ranging from 1hz-1mhz that outputs both sine wave and square wave.we need help in producing a clean sine wave output.how can we produce a clean sine wave from a pic?need your help...thanks...
Microcontrollers :: 07 Mar 2006 12:27 :: naj.cuizon :: Replies: 26 :: Views: 4503
ad9850 interfaced with pic16f877a
hey, anybody here who can help me build a schematic design in interfacing an analog ic ad9850 to a pic16f877a.. i really am having difficulties on the biasing/connecting the ad9850 as well as other components that the ad9850 might need to function p...
Hobby Circuits and Small Projects Problems :: 21 Feb 2006 19:54 :: rfmw :: Replies: 7 :: Views: 1170
i need a tv encoder code & simulation environment
dear sir: i am searching for a tv encoder for self study usage.please help me.b.r...
ASIC Design Methodologies & Tools (Digital) :: 28 Nov 2005 2:33 :: the_penetrator :: Replies: 13 :: Views: 3103
fm modulator
hi, i have a doubt on fm modulator, i would like to know how the circuit for fm modulator works.basically, one generates a carrier frequency and how do they change the phase of the carrier frequency. could anyone explain from the circuit point of vie...
RF, Microwave, Antennas and Optics :: 16 Nov 2005 19:21 :: seadolphine2000 :: Replies: 3 :: Views: 441
dds filter design
i will be designing a clock generator that will operate from 0 up to 200mhz, the dds from analog has a low pass filter of 120mhz cut off. this filter was to eliminate the jitter on the output before beeing fed to internal comparator. if i will design...
RF, Microwave, Antennas and Optics :: 23 Aug 2005 17:31 :: blastronics :: Replies: 10 :: Views: 900
sine wave generation
is it possible to generate some sort of sine wave generation on fpga.using cordic algo is it possible.what shud we do if we want to generate analog signal on fpga.is there any alternative.usman hai...
PLD, SPLD, GAL, CPLD, FPGA Design :: 23 Jun 2005 3:44 :: freeinthewind :: Replies: 20 :: Views: 3078
help - design a network analyzer
rf people,i am trying to design a network analyzer.questions :what detectors?analog devices log amps ?what signal source?use dds (direct digital synthesis) ?use oscilloscope for display?or computer display?or provision for both?software ?thank you fo...
RF, Microwave, Antennas and Optics :: 18 Jun 2005 18:38 :: eltonjohn :: Replies: 11 :: Views: 1812
sine generator module
hii am looking for a sine generator module with frequency range of 30mhz to 100mhz with phase noise better than -135dbc/hz @ 1khz offset.also i like that this module can work stand alone.are there someone know some manufacturers?regards...
Professional Hardware and Electronics Design :: 10 Jun 2005 14:40 :: power-twq :: Replies: 13 :: Views: 714
pll and direct digital synthesieser
hi . id ask you to point me to good books on the subjects:1. pll designs2. advanced frequency systhesiers (digital part is less important)thank you, dan...
RF, Microwave, Antennas and Optics :: 10 Jan 2005 17:57 :: qqyak :: Replies: 3 :: Views: 330
best way to design a sine wave generator with 3 sync outputs
actually i got a problem in designing a good sine wave generator!i got the folllowing needs:3 syncronized outputs!output-frequency 1 - 10 mhzchangeabe in amplitude and phaselow noise outputsmy task is to build an fast digital configurable sine source...
Hobby Circuits and Small Projects Problems :: 07 Jan 2005 13:08 :: Kuehnsen :: Replies: 8 :: Views: 678
fpga vendors
hi friends,i am looking for articles, sites or anything else which describes different fpga products (including evaluation/development boards) from different vendors based on prices and features. could anybody know how i can get these information? th...
PLD, SPLD, GAL, CPLD, FPGA Design :: 15 Dec 2004 0:41 :: SAV :: Replies: 7 :: Views: 948
how to configurate dds (direct digital synthesis)
hi all,i use dds ad9852 it is configurated in parallele programming mode.refclk is 13mhz and i want to generate 100mhz (pin36 vout) this dds is connected at spartan for configuration.thanks for your responsebest regards voho :o...
PLD, SPLD, GAL, CPLD, FPGA Design :: 13 Nov 2004 5:27 :: freeinthewind :: Replies: 1 :: Views: 399
polyphonic ring tone generator
hi can anyone suggest how to produce a pulse width modulated single sine wave using direct digital synthesis technique which is to be used to produce the ring tone generator in a mobile phone in matlab???the behaviour software is as follows:reset: ...
Digital Signal Processing :: 10 Nov 2004 21:31 :: socrates :: Replies: 0 :: Views: 588
direct analog synthesis das
anyone have full references about das?...
RF, Microwave, Antennas and Optics :: 29 Jun 2004 10:18 :: divan :: Replies: 3 :: Views: 492
frequency synthesis
frequencys synthesis...
RF, Microwave, Antennas and Optics :: 16 Jun 2004 22:02 :: papyaki :: Replies: 1 :: Views: 1065
sinus pwm (sigma-delta) generation questions
how make sinus pwm without separate sinus generatorand separate pwm modulator?...
PLD, SPLD, GAL, CPLD, FPGA Design :: 22 Apr 2004 8:32 :: svicent :: Replies: 3 :: Views: 1023
ddfs
whats the difference bw ddfs and nco.usman haipakistan...
Digital Signal Processing :: 21 Apr 2004 9:33 :: Btrend :: Replies: 2 :: Views: 1050
question on dac
hi all....i am designing a dac for wlan application...i am not able to understand one thing about dacs....the speed is qouted as msps...and also a clock for the dac is specified as fclk in data-sheets....which is termed sampling frequencyquestion: wh...
Analog Circuit Design :: 16 Mar 2004 6:17 :: harkonnen :: Replies: 10 :: Views: 1358
about dds
who can tell me how can get the sfdr of direct digital synthesis (dds), :p...
Professional Hardware and Electronics Design :: 22 Sep 2003 16:40 :: steshenko :: Replies: 2 :: Views: 1082
a about principle problem (pwm)
who can answer me the following problem?i will implement a variable frequency pwm output,if i apply the direct digital frequency synthesis(ddfs) technology,is it feasible?...
Professional Hardware and Electronics Design :: 25 Jul 2003 4:39 :: junchaoguo51888 :: Replies: 3 :: Views: 328
accurate & fast signal generation ???
hi all.i would like to generate a digital signal (with only a rising edge then a falling edge), but i would to have an accurate control on the time betwenn to 2 edges.for the moment, i think i can generate a signal with a 6.25ns resolutiondoes anyone...
Professional Hardware and Electronics Design :: 02 Feb 2003 23:58 :: flatulent :: Replies: 5 :: Views: 469
voice changer-distorter needed (pic based)
helloi want to build voice changer for my doughter (you know funny voice coming from hers mouth)? anybody?...
Hobby Circuits and Small Projects Problems :: 26 Jan 2003 3:31 :: runner100 :: Replies: 24 :: Views: 8327
15625hz oscilator
hi!how can i make a 15625hz oscilator?i want to put a ne565 or a 4046 oscilating at that precise frequency, with very small deviation +-10hzthanks!...
Professional Hardware and Electronics Design :: 14 Jan 2003 23:19 :: alterego :: Replies: 14 :: Views: 1854
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