28 Threads found on edaboard.com: Gilbert Cell Multiplier
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 more...search in IEEE website helps or if you can find, get the classic paper by Barry gilbert, the inventor of gilbert (...)
Analog Circuit Design :: 29.10.2004 13:18 :: riz_aj :: Replies: 6 :: Views: 2126
Search for paper by Razavi or Abidi online or at their UCLA website. They wrote quite a considerable amount on gilbert multiplier.
Analog Circuit Design :: 27.10.2004 10:51 :: riz_aj :: Replies: 2 :: Views: 1301
Please specify your questions. there are lots of application of gilbert cell in Analog IC design, especially in RF part.
Analog Circuit Design :: 09.09.2005 17:56 :: nxing :: Replies: 11 :: Views: 6044
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:
The term cos(ωt-ωt)=cos(0)=1 represents just a DC component.
But the term cos(ωt+ωt)=cos(2ωt)
Analog Circuit Design :: 04.12.2006 12:21 :: VVV :: Replies: 6 :: Views: 2601
do pls only "gilbert cell" simple into google :-):
You will have lot of other good answers too..
Electronic Elementary Questions :: 04.06.2010 17:43 :: karesz :: Replies: 11 :: Views: 1101
gilbert cell is a frequency multiplier i.e. If my LO signal is at frequency f1 and my RF signal is at fr
Analog Circuit Design :: 02.08.2010 01:45 :: nnayak82 :: Replies: 1 :: Views: 733
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 (...)
Analog IC Design and Layout :: 11.10.2011 10:46 :: rahulloveselectronics :: Replies: 2 :: Views: 608
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?
Electronic Elementary Questions :: 10.11.2012 20:28 :: mansibhargava :: Replies: 0 :: Views: 456
The NE602 and NE612 are mixers containing a gilbert cell and they are
Analog Circuit Design :: 26.04.2004 14:54 :: Tornado :: Replies: 7 :: Views: 2095
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 (...)
RF, Microwave, Antennas and Optics :: 02.03.2005 17:32 :: bouchy :: Replies: 1 :: Views: 845
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.
Analog Circuit Design :: 04.05.2005 01:13 :: hanm :: Replies: 1 :: Views: 710
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.
Analog Circuit Design :: 18.07.2005 23:41 :: crystal :: Replies: 5 :: Views: 1723
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.
Analog Circuit Design :: 23.03.2006 02:04 :: Vamsi Mocherla :: Replies: 3 :: Views: 900
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 (...)
Analog Circuit Design :: 05.12.2008 01:58 :: FvM :: Replies: 4 :: Views: 3355
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...
Analog IC Design and Layout :: 21.03.2009 12:18 :: sam244 :: Replies: 1 :: Views: 1779
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
Analog Circuit Design :: 13.12.2010 03:10 :: steinar96 :: Replies: 5 :: Views: 402
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 (...)
Analog Circuit Design :: 28.12.2010 13:37 :: FvM :: Replies: 4 :: Views: 616
A common way to do analog multiplication is with a gilbert cell.
Analog Circuit Design :: 07.02.2013 13:33 :: crutschow :: Replies: 1 :: Views: 227
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.
RF, Microwave, Antennas and Optics :: 19.05.2004 02:18 :: sunwiss :: Replies: 5 :: Views: 1052
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
Analog Circuit Design :: 17.12.2006 22:21 :: zhangseong :: Replies: 1 :: Views: 801
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
Analog Circuit Design :: 24.03.2007 09:52 :: unkarc :: Replies: 19 :: Views: 21032
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 (...)
RF, Microwave, Antennas and Optics :: 01.11.2007 04:40 :: khouly :: Replies: 1 :: Views: 1087
You can use the mixer structure to multiplier a square wave and a sinusoid, i attacched the gilbert cell mixer structure. You have to put the square wave on LO imput and the analog sinusoid on rf input
Analog IC Design and Layout :: 22.03.2009 04:57 :: macg84 :: Replies: 5 :: Views: 1166
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
RF, Microwave, Antennas and Optics :: 24.06.2009 05:53 :: amr87 :: Replies: 0 :: Views: 570
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 (...)
Analog Circuit Design :: 06.02.2010 07:19 :: FvM :: Replies: 11 :: Views: 4571
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 (...)
Analog Circuit Design :: 22.08.2011 03:41 :: FvM :: Replies: 4 :: Views: 1244
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.
Analog Circuit Design :: 19.12.2011 15:34 :: SherpaDoug :: Replies: 6 :: Views: 1084
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
Electronic Elementary Questions :: 27.07.2012 05:39 :: FvM :: Replies: 7 :: Views: 1229