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line code...
what is line code? suppose (8,10) means what it represent in linecode? in telecommunication , what is min distance for repeaters.. define skew rate and its value in op-amp......
Digital communication :: 09 Oct 2007 12:56 :: master_picengineer :: Replies: 2 :: Views: 144
clock recovery
hi,i think about designing a clock recovery module. how should i proceed ?...
PLD, SPLD, GAL, CPLD, FPGA Design :: 25 Sep 2007 8:55 :: master_picengineer :: Replies: 7 :: Views: 228
simple question
i have a simple question. how do you convert mhz to mbps? say for example i have a lvds receiver operating at 400mbps, so is the operating frequency 400mhz or 200mhz? the reason i ask is that some company products specify the working frequency as 200...
Analog Circuit Design :: 21 Sep 2007 21:54 :: Eugen_E :: Replies: 4 :: Views: 375
wireless lan with robot
i want to design robot and control via wireless lan. who have data for thisthank....
Microcontrollers :: 25 Aug 2007 21:17 :: mohsin677 :: Replies: 17 :: Views: 1227
help u2270
hello.i have a problem with u2270b and em-4001 transporder.antena i have l=627uh. and build other shematic, work but i don`t have good card code.in em-4001 the first 9 - bits is 1, i have this bits but last bits is not good.in pin u2270 - output a ha...
Microcontrollers :: 13 Aug 2007 8:58 :: wek :: Replies: 7 :: Views: 1020
what is manchester coding?
i want to ask what is manchester coding in communication? what is the advantage of using this coding?thx:)...
Electronic Elementary Questions :: 30 Jul 2007 13:10 :: A.Anand Srinivasan :: Replies: 3 :: Views: 186
tips to communicate over one wire (power+datas/ gnd)
hello everyone !for a small project, id like to transmit some datas (at around 115200bps) on only one wire + its gnd.i think that the receiver would need around 5w to work correctly (5v 1a).i thought that simple tricks, like +5v = logical 0 and +12v ...
Analog Circuit Design :: 26 Jul 2007 15:21 :: Piwi :: Replies: 3 :: Views: 177
manchester encoding/decoding???
what exactly is this method of encoding/decoding? is there any .asm code examples for tx/rx modules from laipac??? im using tlp434a and rlp434....
RF, Microwave, Antennas and Optics :: 09 Jul 2007 23:48 :: RBB :: Replies: 1 :: Views: 207
source &channel coding
what are the difference between source coding and channel coding..plz explin it with some examples......
Electronic Elementary Questions :: 01 Jul 2007 18:22 :: nileshjoshi :: Replies: 8 :: Views: 495
modelsim error but activhdl success
hi,i tried to compile a vhdl code (from xilinx.com) which contain following line:if rst = 1 or std_logic_vector(no_bits_sent) = 1010 then by modelsim5.6 i received following error message:subprogram = is ambiguous. suitable definitions exist in packa...
PLD, SPLD, GAL, CPLD, FPGA Design :: 25 Jun 2007 14:30 :: ahmadagha23 :: Replies: 2 :: Views: 183
pic + rf modules
hi everyone,project im currently doing involves pic microcontroller and rf transmitters and receivers. i guess some of you already have some experience with this staff. distance beetwen receiver and transmitter will be approximately 40 meters. im no...
Microcontrollers :: 20 Jun 2007 15:34 :: CMOS :: Replies: 6 :: Views: 957
rf tranceiver help plz...
hi all! great forum! i need your help guys please!! im really stumped!here is my setup: im using a remote board with radiometrix rf transmitter and receiver. the datasheets for them can be found here :http://www.radiometrix.co.uk/dsheets/tx2arx2a.pdf...
RF, Microwave, Antennas and Optics :: 20 Jun 2007 5:08 :: TheRidDler :: Replies: 0 :: Views: 201
fsk modulation of 1mbps data on a pll loop
helloi want to use an analod device pll (adf4xxx) and a vco from minicircuits (in range about 2ghz, and modulate the 1mbps data on it ,my modulation type is fsk.how can i modulate this high data rate signal? what is the value of frequency seperation?...
RF, Microwave, Antennas and Optics :: 19 Jun 2007 9:33 :: 7rots51 :: Replies: 3 :: Views: 219
interface ethernet port with c++ code
how can i interface ethernet port in c++ ? can you help me please?thanks...
Microcontrollers :: 18 Jun 2007 9:20 :: are :: Replies: 8 :: Views: 837
matching em4095 rfid reader with tag
hi,i want to use em4095 ic to build rfid reader. i would like to use 125khz tags that sends manchester code. i know that em microelectronic have tags like em4100, but i was wondering if you can tell me some of the manufacturers of plastic card tags w...
RF, Microwave, Antennas and Optics :: 15 Jun 2007 8:00 :: mdusan :: Replies: 0 :: Views: 270
communication paper
hey... i need project papers about communication systems(like encoder and decoder) implementating in verilog r vhdl.. can any one pl help me.....
PLD, SPLD, GAL, CPLD, FPGA Design :: 07 Jun 2007 17:59 :: venkat3271 :: Replies: 5 :: Views: 390
long range rfid - 125 khz
hi i looking for project , ideas for long range passive rfid 125 khz - long range = about 100 cm.i want to read word tag unique with manchester encoding.any ideas ?i found some information on internet - i buy oem reader but all time range is too smal...
RF, Microwave, Antennas and Optics :: 03 Jun 2007 6:45 :: Usmanaih :: Replies: 18 :: Views: 2370
anyone use microchip rfpic12f675k chip for remote control?
hi.. has anyone there used microchip rfpic12f675k chip before in remote control design? i plan to use this chip to design a wireless sensor for my own wireless alarm system. but the problem i am having now is the battery is draining too fast for co...
Microcontrollers :: 01 Jun 2007 4:53 :: luis171 :: Replies: 14 :: Views: 1860
manchester decoding
hi i have some problem in decoding manchester codes from rfid reader . i am using avr codevision. i am searching for any good algorithm for manchester decoding?...
Hobby Circuits and Small Projects Problems :: 30 May 2007 13:52 :: nba83 :: Replies: 0 :: Views: 516
manchester decoding for rfid
hi i am having some problem in manchester decoding algorithm ,can any body help me to go on, i need it for decoding rfid signals....
Microcontrollers :: 30 May 2007 8:17 :: nba83 :: Replies: 0 :: Views: 285
fpga rfid reader!!@@
ce, my project is rfid reader i have almost done the hardware portion , but now i switched to fpga,what i have to done is that i have demodulated signal i just need to decode this demodulated signal, manchester coding is there.im using 134.2khz read ...
PLD, SPLD, GAL, CPLD, FPGA Design :: 17 May 2007 22:29 :: mmoctar :: Replies: 3 :: Views: 570
raised cosine filter
hi,i wanna design a transmission link in simulink.the data is manchester coded.then goes through raised cosine filter with oversampling ratio 32,data rate 80kbps.therefore:1)ts in machester coding block is 1/80khz=12.5*10^(-6),am i right?2)for the ra...
Digital Signal Processing :: 29 Mar 2007 18:03 :: hk :: Replies: 0 :: Views: 210
nrz and rz
hai every onewhat is the exact difference between non return to zero(nrz) and return to zero(rz) wave forms.which will be having more probabilty of error ........or bit error rate.............
Digital communication :: 18 Mar 2007 12:48 :: SKS :: Replies: 3 :: Views: 183
rfid proj
my tag uses manchester/biphase coding . can i use htrc110 (4m philips) on d base station side aith atmel mega 32? i need help in deciding which base station interface ic to use and how 2 choose a compatible microcontroller wid d same... plz replythan...
RF, Microwave, Antennas and Optics :: 12 Mar 2007 17:21 :: tanzil_dhk :: Replies: 2 :: Views: 321
serial transmission of data
hi all.. i need ur help for doing my project secure wierless communicationi did the encryption and decryption of parallel data. i want to convert this encrypted parallel data 2 serial and transmit this to the destination (decryption side). please se...
Microcontrollers :: 24 Feb 2007 5:28 :: Buriedcode :: Replies: 4 :: Views: 282
help with transmitter using resonator and pic
hello all, i have some general questions if someone can help me out. i have a supply of receivers and transmitters that i would like to use in my project using an atmel avr micro. the receiver uses a kesrx01 ic and a pic micro. i would like to disco...
RF, Microwave, Antennas and Optics :: 17 Feb 2007 6:43 :: Lupe :: Replies: 4 :: Views: 753
difference between analog and digital bandwidth..
hey guys does anybody knows difference between analog and digital bandwidth..in relation with analog and digital circuit design......
Analog Circuit Design :: 06 Feb 2007 14:56 :: abel51 :: Replies: 4 :: Views: 1140
serial communincation between two microcontroller using ir
i want to make serial communication between two microcontroller using ir.but i donot want to use ir reciever moudels (from vishay) instead i want to use simple ir led as transmitter and ir photo-diode as reciever.to decrease the cost....
Microcontrollers :: 02 Feb 2007 16:53 :: joebazoka :: Replies: 4 :: Views: 366
can u help me?
hi,i am final year student.-i am doing a final year project named dwoc(digital wireless optical communication).-inside this project, i am using a pic16f877a to do the modulation job(manchester coding).-i will transfer my data from pc via rs232 to my ...
Microcontrollers :: 18 Jan 2007 23:29 :: madmax55 :: Replies: 2 :: Views: 237
at89c52, 0-to-1 transition in t2ex
hi,at89c52 exen2 is set, a 0-to-1 transition in t2ex. is it posible? if not how can we do?i got incoming signal which is 10 and 01 for 10=zero and 01=one. how can i verify this to two signal in my code?please guide me in c program.thank you....
Microcontrollers :: 18 Jan 2007 2:31 :: Help :: Replies: 13 :: Views: 330
rf receiver output connected to uc
hi,i bought one rf receiver.my question is is it possible we direct connect the receiver output to uc(at89c52) rather than we use the decoder to decode the receiver signal?as i know the manchester coding and decoding for use with rf modules...encodin...
Electronic Elementary Questions :: 14 Jan 2007 5:35 :: Help :: Replies: 4 :: Views: 198
help with interview question #1
hi, members,ive some interview questions about digital circuit, vhdl and asic/fpga. i think its a good opportunity for us to discuss these questions. maybe its very helpful when we want to seek for jobs in the near future. the following is the first ...
ASIC Design Methodologies & Tools (Digital) :: 20 Dec 2006 11:45 :: rakesh1234 :: Replies: 11 :: Views: 540
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: 783
coding method
hi everyone,when i took digital and analog communication class, the teacher said manchester coding is the cheapest and effective way of coding compare to non return zero, return zero and other type of coding which i dont remember. my question is how ...
Digital communication :: 17 Dec 2006 12:08 :: cabone :: Replies: 2 :: Views: 234
fm hybrid tx / rx modules
has anyone tried this module from rfsolutions.co.uk? http://www.rfsolutions.co.uk/acatalog/hybrid_transmitter_receiver_modules.html i encountered a few problems and wish to discuss......
RF, Microwave, Antennas and Optics :: 07 Dec 2006 17:53 :: 7rots51 :: Replies: 1 :: Views: 105
8-bit adder
hi all,we have a project to implement an 8-bit carry lookahead adder in cmosp18 technology. do you have any suggestions on what type of logic to use? at the moment, we are thinking of implementing a logarithmic adder (kogge-stone) in static cmos, but...
ASIC Design Methodologies & Tools (Digital) :: 29 Nov 2006 9:39 :: aslijia :: Replies: 8 :: Views: 471
i need a help
hello,i need some documentations obout ferrite microstripplease help methanks a lot...
RF, Microwave, Antennas and Optics :: 28 Nov 2006 13:03 :: as-zu :: Replies: 4 :: Views: 168
vhdl explained with circuit
hello all.. can anyone suggest any book which explains vhdl code writing from given circuits, how does the code creat latch and flip flop and vice versa with lot of good examples with corresponding circuits(fir filter circuit and code ...
PLD, SPLD, GAL, CPLD, FPGA Design :: 12 Nov 2006 6:31 :: lawrence_idol :: Replies: 3 :: Views: 648
manchester encoder
im trying to design a manchester encoder circuit using a piso shift register and an xor gate. i ran into a couple problems. 1. timing: i need to synchronize the shift register output with the clock (clocking it) i.e. i need to delay the clock (runnin...
Digital communication :: 18 Oct 2006 9:52 :: Lupin :: Replies: 1 :: Views: 213
manchester encoder
im trying to design a manchester encoder circuit using a piso shift register and an xor gate. i ran into a couple problems.1. timing: i need to synchronize the shift register output with the clock (clocking it) i.e. i need to delay the clock (running...
Other Design :: 18 Oct 2006 8:31 :: Jepeto :: Replies: 8 :: Views: 708
which em simulator works best for resonant circuits?
hello and thanks in advance,im trying to simulate a open-loop resonator filter, which is a highly resonant circuit.using mwo and cst for simulation works really bad. only ensemble gives a good response in comparation with measurments, but i have no i...
Electromagnetic Design and Simulation :: 25 Sep 2006 10:12 :: akedar :: Replies: 13 :: Views: 666
what's non-reture-zero encoding?
it seem that nrz encoding result of input bit stream is just like itself.i am puzzled, how to understand the value of nrz?please explain the other kinds of digital data encoding method.thanks of millions....
Digital Signal Processing :: 20 Sep 2006 11:00 :: asnivas :: Replies: 7 :: Views: 750
rf communication use a sample circuit(example in avr)
http://images.elektroda.net/5_1156941254.gif...
Microcontrollers :: 16 Sep 2006 23:20 :: Abu Ammora :: Replies: 18 :: Views: 2559
raised cosine filter
hi,may i know is it i should modulate a manchester coded pulse by using ask,psk or fsk before the raised cosine filter?so that i can get a some sort like sinewave output?thanks for any advices....
Digital communication :: 11 Sep 2006 6:39 :: bulx :: Replies: 2 :: Views: 351
dc_balance
ec that i am reading now.ac-coupling works best with encoded data that provides an equal number of ones and zeros (a dc-balanced signal). just to name a few, 50% duty-cycle clocks, 8b/10b coding, and manchester-coded data are all examples of dc-balan...
Digital Signal Processing :: 11 Sep 2006 4:08 :: s8319 :: Replies: 3 :: Views: 201
raised cosine filter
hi,anyone knows why i couldnt get a continuous sine wave like this:http://images.elektroda.net/71_1157706676.gifafter i input manchester coded random data into raised cosine filter but ends up getting square waves in time domain? i am using digital r...
Software Problems, Hints and Reviews :: 08 Sep 2006 10:19 :: hk :: Replies: 0 :: Views: 144
fm0 line coding and manchester line coding in simulink
hi,anyone knows how to build a fm0 coded random data in simulink? or anyone has the fm0 matlab code so that i can link it to simulink model?is this method possible? -i found the way to build manchester coded random data as shown below,but i am not su...
Software Problems, Hints and Reviews :: 02 Sep 2006 5:56 :: hk :: Replies: 0 :: Views: 522
fm0 coded random data
hi,anyone knows how to build a fm0 coded random data in simulink?-i found the way to build manchester coded random data as shown below,but i am not sure whether i will get the manchester coded random data in the end as shown in the figure?can anyone ...
Digital communication :: 01 Sep 2006 6:01 :: hk :: Replies: 0 :: Views: 120
manchester coding random data in simulink
hi,i am facing problem on building manchester coded random data and fm0 coded random data in simulink.anyone can help?thanks for reply!...
Electromagnetic Design and Simulation :: 24 Aug 2006 9:03 :: hk :: Replies: 0 :: Views: 294
manchester carry chain
can anyone help me to size a 4 bit manchester carry chain adder using concept of logical effort? added after 1 minutes: if u can point to some document that helps to analyze logical effort of transmission gates in series, then it would be grt too!...
ASIC Design Methodologies & Tools (Digital) :: 18 Aug 2006 4:23 :: designtech :: Replies: 0 :: Views: 180
how to decode fm data to nrz data, without 16x clock
how to decode fm data to nrz data, without 16x clock...
PLD, SPLD, GAL, CPLD, FPGA Design :: 12 Aug 2006 20:51 :: sheik_vb :: Replies: 2 :: Views: 201
micrel's micrf505 based design
hi,has anyone here worked on micrel rf chip micrf505. please let me know i am facing some problems in my design.thanks in advance....
RF, Microwave, Antennas and Optics :: 11 Aug 2006 23:02 :: biff44 :: Replies: 4 :: Views: 207
pll
what means pll and what for is it used? someone told me that he used it for synchronisation in inverters....
Electronic Elementary Questions :: 06 Aug 2006 12:41 :: mjinux :: Replies: 15 :: Views: 1413
led array heat issue
hi,i am new to electronics and need some help with a project i am building so any advice would be greatly appreciated.i have built an array of 48 high power leds (3.5v, 125ma) running on a 12v power supply. the array was built using stripboard and is...
Hobby Circuits and Small Projects Problems :: 28 Jul 2006 15:24 :: PaulHolland :: Replies: 38 :: Views: 1731
wire less modem
hello all,i was asked to design a wireless modem for a lab experiment.. but i am not sure what exactly it is.. can a fm transceiever also be called as a wireless modem?? what exactly is wire less modem?? please,any one of you help me.. added after 4...
RF, Microwave, Antennas and Optics :: 18 Jul 2006 16:34 :: eeklac :: Replies: 3 :: Views: 576
bit streaming for comms
hi,this is a pretty basic quesiton, but i cant seem to find a satisfactory answer, and considering its used in almost all digital comms, i thought id try here.without designing custom ics, or using programmable logic (fpga/cpld) how exactly could one...
Digital communication :: 25 Jun 2006 20:18 :: Buriedcode :: Replies: 6 :: Views: 663
manchester coding
what is the advantage of manchester coding in encoding audio data .?i want the coding format for a data ....
Electronic Elementary Questions :: 23 Jun 2006 16:24 :: teteamigo :: Replies: 13 :: Views: 1332
pic + 433 mhz modules + assembler
hi:i purchase transmitter and receiver modules 433 mhz, somebody have examples with microchip pic in assembler please.thanks in advance....
Microcontrollers :: 05 Jun 2006 4:54 :: pic-novato :: Replies: 6 :: Views: 336
failure in clock recovery of manchester coding like nrz
i have a doubt:nrz-----------| 1 | 0 | 1 | 0 | 1 | 0 |manchester-|1 0|0 1|1 0 |0 1|1 0|0 1 |this sequence generate a failure in clock recovery.in this case the manchester signal have period=3/2*t.the 0|0 adjacency dont have...
Digital communication :: 23 May 2006 9:37 :: teteamigo :: Replies: 1 :: Views: 297
signalling rate and bandwidth
ling rate of r is r/2. i think this relation is meant only forpolar pam signalling. does the same relation between bandwidth and signalling rate hold for other signalling methods (unipolar, bipolar, manchester)?m...
Digital communication :: 17 May 2006 7:31 :: sidra :: Replies: 6 :: Views: 408
pls clarify concept of carrier recovery on receiver chain
hi all,my application is a satellite receiver with only one channel (not multi-channel application). bit rate of digital message is 400bps. the specification says: the data are encoded biphase-l or manchester. the carrier is phase-modulated positive...
RF, Microwave, Antennas and Optics :: 05 May 2006 7:27 :: teteamigo :: Replies: 3 :: Views: 273
can anyone help me? i want to build an fm rx with tda7000!!
hi all, i want you to help me to build a high bit rate rx using tda7000.. i could build the rx as described in its datasheet, but it allow bit rate not higher than 9kbps i want to increase its bit rate.. i think that reason of that low bit rate...
RF, Microwave, Antennas and Optics :: 20 Apr 2006 0:42 :: ahmad_abdulghany :: Replies: 5 :: Views: 279
ir or rf?
i purchased an 60 usd universal control in the hope to be able to use it with my noname catv box all it says is just explorer made in korea, it has a learning option which requiers the original remote of course which i dont have anymore so my questio...
Electronic Elementary Questions :: 29 Mar 2006 18:15 :: shadowsa :: Replies: 14 :: Views: 591
nand gate ic problem... plz help
while making manchester encoding circuit ... i am giving nrz-biphase input to the nand gate ic (74ls08) ... but when i connect my input (nrz-bi) to 7408 , my input automatically converts to nrz unipolar .... i tried removing ics vcc but the problem c...
Analog IC Design & Layout :: 27 Mar 2006 12:02 :: silvio :: Replies: 9 :: Views: 666
manchester enc0der/dec0der circuit
hii want to implement the manchester in hw by 74 and pll chips ,does anyone have a sch for it.if yes please upload it....
Professional Hardware and Electronics Design :: 23 Mar 2006 19:42 :: ak214 :: Replies: 3 :: Views: 747
trxq1 a wireless communication for rs232
i just constructed two circuit with max232 and trxq1. my purpose is wireless communication between of computer1(node a) and computer2(node b).i built it the same at sample of datasheet on page 9 with max222 is replaced max232 and tied mode pin (numbe...
Microcontrollers :: 21 Mar 2006 8:57 :: conkhicon :: Replies: 1 :: Views: 126
hdlc interface
hellois there a chip that do the hdlc protocol? it gets the packets from the serial line and place at a rx fifo ,and get data from tx fifo and packetize it and place it on serial line.please give ic part number or a circuit that can co this job.thank...
Professional Hardware and Electronics Design :: 21 Mar 2006 6:41 :: onioni :: Replies: 14 :: Views: 7757
near range ultrasonic communication
dear all,i wanna design an ultrasonic circuit for near range communication. let me refer it as tag at the moment. 2 meter tag-to-tag communication range is what i aim for.there will be a transmitter and a receiver on the tag. i have a referenced ultr...
Hobby Circuits and Small Projects Problems :: 20 Mar 2006 15:09 :: throwaway18 :: Replies: 4 :: Views: 333
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clock transmission between 2 fpga
hello everybody !i have a project to realize, i.e. the connection of many fpga (board altera apex 20ke) into a network-on-chip. the main issue i have is that the has a frequency of 33.333mhz with a precision of +- 1ppm.so, when i send informations (s...
PLD, SPLD, GAL, CPLD, FPGA Design :: 17 Mar 2006 9:41 :: sp :: Replies: 2 :: Views: 231
trxq1 wireless rs232
i just constructed two circuit with max232 and trxq1. my purpose is wireless communication between of computer1(node a) and computer2(node b). i built it the same at sample of datasheet on page 9 with max222 is replaced max232 and tied mode pin (numb...
RF, Microwave, Antennas and Optics :: 17 Mar 2006 3:33 :: conkhicon :: Replies: 0 :: Views: 813
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