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## Gilbert Cell Multiplier |

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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:
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)

Analog Circuit Design :: 04.12.2006 12:21 :: VVV :: Replies: **6** :: Views: **2601**

Hi,
do pls only "**gilbert** **cell**" simple into google :-):
You will have lot of other good answers too..
K.

Electronic Elementary Questions :: 04.06.2010 17:43 :: karesz :: Replies: **11** :: Views: **1101**

Analog Circuit Design :: 02.08.2010 01:45 :: nnayak82 :: Replies: **1** :: Views: **733**

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 (...)

Analog IC Design and Layout :: 11.10.2011 10:46 :: rahulloveselectronics :: Replies: **2** :: Views: **608**

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, :)

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
inexpensive.
Tornado

Analog Circuit Design :: 26.04.2004 14:54 :: Tornado :: Replies: **7** :: Views: **2095**

Hi Faisal,
1- frequency **multiplier**s 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**

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.

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**

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

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**

Hello,
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**

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

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 **multiplier**s (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 **multiplier**s

Electronic Elementary Questions :: 27.07.2012 05:39 :: FvM :: Replies: **7** :: Views: **1229**

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