Search Engine

Gilbert Multiplier

Add Question

42 Threads found on Gilbert Multiplier
hello friends i have to design gilbert multiplier ckt using mos and cmos structure. plz tell me hw will we design cascading of this ckt in spice code mixedmode simulation.and dc simulation i am doing work on silvaco plz tell me solution of this problem.
hello friends i have to design a gilbert multiplier using cmos.but i have a problem in atlas code. i am designing this ckt in mixedmode using atlas simulator.plz tell me hw to write a code in mixedmode.give me a example of this type of ckt.
The NE602 and NE612 are mixers containing a gilbert cell and they are inexpensive. Tornado
Many analog electronics book has a chapter on analog multiplier. Razavi CMOS design book has a small section on this under differentail amplifier section. Gray/Meyer book should have it too. And many in IEEE website helps or if you can find, get the classic paper by Barry gilbert, the inventor of gilbert (...)
Search for paper by Razavi or Abidi online or at their UCLA website. They wrote quite a considerable amount on gilbert multiplier.
can anyone show me the gilbert multiplier circuit? thanks!
I assume that you are posting in the analog forum you want an analog multiplier. Do you want to multiply two analog signals or produce a higher harmonic of a sine wave. For the first there is the original gilbert multiplier from his 1968 paper. He took the four quadrant switching mixer which dates back to valve/tube days and put (...)
the last section is the CMOS Based gilbert multiplier. I apparantly came across the same paper and found this nov 2005 link of urs. hope it helps.
Hello, I am trying to plot the ac response of a gilbert cell multiplier. I have set the differential pair inputs as V1 + v1 and V1 - v1. For the quad transistors, I have given V2 + v2 and V2 - v2 as inputs. To perform ac analysis, I have set the quad pairs ac magnitude as 0 and the diff pairs ac magnitude as 1, now after performing the simulati
i would suggest a gilbert multiplier or even a bandgap reference. both of these are quite interesting topics, that give a good foundation into more complex projects. i had a post on here somewhere about building a bandgap with 2n3904 and 2n3906 and resistors. i bet you could build one for less than $1 US, and you get a temperature and voltage
well.... a pll is never really pure analog - somewhere in the system you need to compare the phase, which gives a discrete-time voltage. this voltage may be a sine wave, but it is "chopped" in a digital fashion. sum all these chopped chunks of sinewave into a cap, and you creates a voltage proportional to your phase difference between the signal
Hi, razavi's classical analog IC book talks about it, the common used one is gilbert cell, you can also search in google to find papers.
Search for current mode blocks like current conveyor and gilbert cell. Should give you a better idea on what's current mode as well as multiplier.
Please specify your questions. there are lots of application of gilbert cell in Analog IC design, especially in RF part.
Well, a mixer and multiplier are of same type of architecture. The function realized by a multiplier and the mixer are the same. So, you must be using Spectre for simulation which is fine. Usually people use single quadrant gilbert cell type.
If you fed the same signal u(t)=U*sinωt to both inputs of the gilbert cell, it will multiply the two signals. Therefore, you will get: Uo=U^2*sinωt*sinωt=0.5*U^2*(cos(ωt-ωt)-cos(ωt+ωt) The term cos(ωt-ωt)=cos(0)=1 represents just a DC component. But the term cos(ωt+ωt)=cos(2ωt)
The six transistor circuit was around for years before gilbert. gilbert described it in his first paper on multipliers which used FETs.
Try with gilbert mixer. It's one of the classics
Hi! I intend to find the peaks ant troughs of the output of a gilbert multiplier in a pll though a differentiator and then sample these points. The difference between minima and maxima is simply the DC voltage. Is that feasible?
Translinear principle. Non-linear arithmetic operations are achieved with ease with TLP circuits. Second chapter in Toumozou's book on Current mode circuits is the material to start with which is written by gilbert, the inventor of these class of circuits. en.wikipedia
How can I find basic information about gilbert cell, mixer and phase shifter? thanks
gilbert Cell is a frequency multiplier i.e. If my LO signal is at frequency f1 and my RF signal is at fr
i've used gilbert topology.........
Signals can be added with a summing amplifier Op Amp Summing Amplifier Multiplication can be done with a gilbert cell but these are rather complex when built discretely. There are IC circuits which can perform this for you. gilbert cell - Wi
A multiplier is basically a nonlinear circuit, needing non-linear elements other than OPs. Depending on the intended operation (1/2/4-quadrant), dynamic and frequency range, different multiplier circuits or ICs are available. Some of them are log/antilog mutiplier (1-Q, high dynamic, limited bandwidth) basic gm-multiplier, also OTA-IC (...)
A PLL like a 4046 would do the job, except the 4046 doesn't go quite that high in frequency. A PLL like TLC2934 has a sufficient VCO frequency range, but not the specified lock range. Generally, the dynamic PLL behaviour for wide frequency range is rather poor due to the bad matched loop filter. It depends on how pure you
Hi, Can you please tell me - the difference between gilbert cell and four quadrant multiplier? - what will affect the output frequency in four quadrant multiplier. i.e. the output frequency will be a multiple of both input or division of them? Thanks, :)
A common way to do analog multiplication is with a gilbert Cell.
Hi Chopping method should be one type of multiplication. The classical chopping mixer is gilbert cell, which topology is simple. Performance trade-off is good. Multipling mixer often consists of many devices, which topology is complex. They often realize frequency conversion through current multiplicaion.
To expand on Flatulent's response, you can build a four quadrant multiplier out of gilbert cells (they can be constructed out of <10 discrete transistors). Refer to the following link:
Hi Faisal, 1- frequency multipliers are used as signal generation technique, permeting one to abtain and utilize the harmonics of a fundamental frequency technique, meaning if your input frquency is "f" you can get 2xf or 3xf ... 2- one of the approches that is been used for analog divider and multiplier is gilbert cell (...)
my design is to replace PLL to get a 50% duty design include a gilbert cell as a frequency multiplier follow by a frequency divider(divide by 2 -D flip-flop) jitter problem for input is input is just a pulse wave(~48Mhz) so phase lock i ignore my question is .. is this simple design will be succcesfull? is this comb
Hi All, Let me mention another method for a frequency doubler circuit, apparently neglected by many people, which is a four quadrant multiplier or known as gilbert cell. If you connect the two inputs together and apply a sinusoidal input, you will get a DC term + a double frequency sinusiodal voltage at the output. It is nearly as wid
mm , this topic is soo long , and very interesting the DPLL : digital PLL is the where some blocks are digital and some are analog " the PFD , the divider " digital and the CP and the VCO and the loop filter are analog , the most commonly the LPLL is all analog one , even the phase detctor is a multiplier "something like gilbert cell" ,
Reviewing this classical document, I was aware that Vahab actually didnt't mention if the application is kHz or MHz domain. For low frequency (e. g. audio) range, a log/antilog circuit, either as an IC or built from individual parts, is offering superior dynamic, for high frequency, only gilbert-cell multiplier circuits or thermal detectors are usa
Does anybody have some papers about gilbert cell mixer structure for this particular case of mine ? _Squ!D_ Added after 1 hours 5 minutes: Hello, You can use the mixer structure to multiplier a square wave and a sinusoid, i attacched the gilbert cell mixer structure.
This paper is implemented using a W/L of 10/30 and now we are trying to implement it using 0.5 um AMI technology. What least value we can assign to W/L..? Please help...
Hi We all know that the mixer is just a multiplier that can be modeled mathematically as V_out = m(t) * cos(wc*t) where: m(t) is the input modulating signal wc is the carrier frequency if we are upconverting from an IF-frequency then V_out = cos(w_IF*t) * cos(wc*t) = 0.5*(cos((wc+w_IF)t)+cos((wc-w_IF)t))) And we are interested
an arithmetic divider that operates ideally at any frequency Keep on dreaming. From the existing analog multiplier/divider variants, only "gilbert cell" (gm multiplier) is wideband. Log/antilog offers higher dynamic range but is restricted to MHz bandwidth at best, hall sensor multipliers (rather unusual) possibly (...)
I fear, the term voltage controlled amplifier isn't very clear. I presume, you are referring to a variable gain amplifier (VGA). It comes in different flavours with rather different specifications regarding bandwidth, linearity and dynamic range. The classical building block for VGAs is a gm multiplier respectively a gilbert cell, comprised of BJT.
Changing the current through R2 should change the BE impedance of Q1 & Q2, which changes the gain. That is the principle behind a gilbert cell mixer. You only have half a gilbert cell so you are unbalanced and will see some DC bias shift as well. It is possible the BE impedance change is swamped by R3 diminishing the effect.
Some basic considerations about FET as variable resistors can be found in this thread To use it right in a VCA structure, you should understand the basic limitations regarding voltage range, linearity, matching of multiple transistors. All high performance VCA ICs are essentially analog multipliers