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## Gilbert Cell Multiplier |

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19 Threads found on edaboard.com: **Gilbert Cell Multiplier**

I am a first time analogue designer and need help with my **gilbert** **cell** **multiplier**(CMOS 0.18um technology). The problem is that my circuit doesn't bias correctly.I work in low frequency. the output that I need, the plot of four quadrant of **multiplier**.
***gilbert** **cell** analog 5
.options (...)

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 08-27-2014 00:22 :: m.afzal :: Replies: **1** :: Views: **252**

Are you using the differential output? I did a quick simulation of a bipolar **gilbert** **cell** mixer IC I designed a while ago and you get massive clock feedthrough if you don't look at the difference between the two outputs.
Keith

Analog Circuit Design :: 11-22-2013 12:42 :: keith1200rs :: Replies: **9** :: Views: **968**

A common way to do analog multiplication is with a **gilbert** **cell**.

Analog Circuit Design :: 02-07-2013 13:33 :: crutschow :: Replies: **1** :: Views: **338**

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, :)

Elementary Electronic Questions :: 11-10-2012 20:28 :: mansibhargava :: Replies: **0** :: Views: **630**

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 :: 12-19-2011 15:34 :: SherpaDoug :: Replies: **6** :: Views: **1338**

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 Integrated Circuit (IC) Design, Layout and Fabrication :: 10-11-2011 10:46 :: rahulloveselectronics :: Replies: **2** :: Views: **789**

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 :: 08-22-2011 03:41 :: FvM :: Replies: **4** :: Views: **1563**

Analog Circuit Design :: 08-02-2010 01:45 :: nnayak82 :: Replies: **1** :: Views: **930**

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 :: 02-06-2010 07:19 :: FvM :: Replies: **11** :: Views: **5323**

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 Integrated Circuit (IC) Design, Layout and Fabrication :: 03-21-2009 12:18 :: sam244 :: Replies: **1** :: Views: **1961**

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 :: 03-24-2007 09:52 :: unkarc :: Replies: **19** :: Views: **22558**

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 :: 12-17-2006 22:21 :: zhangseong :: Replies: **1** :: Views: **910**

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 :: 12-04-2006 12:21 :: VVV :: Replies: **6** :: Views: **3279**

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 :: 03-23-2006 02:04 :: Vamsi Mocherla :: Replies: **3** :: Views: **1087**

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: **6555**

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 :: 07-18-2005 23:41 :: crystal :: Replies: **5** :: Views: **1852**

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 :: 05-04-2005 01:13 :: hanm :: Replies: **1** :: Views: **812**

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 :: 03-02-2005 17:32 :: bouchy :: Replies: **1** :: Views: **943**

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 :: 10-27-2004 10:51 :: riz_aj :: Replies: **2** :: Views: **1445**

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clock and recovery | data communication solutions | filter opamp loop | clock driver | start circuit stability | matlab wav | architecture interview | rake receiver code | gain error | frequency calculator