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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 04:22 :: m.afzal :: Replies: **1** :: Views: **489**

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 17:42 :: keith1200rs :: Replies: **9** :: Views: **2294**

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

Analog Circuit Design :: 02-07-2013 18:33 :: crutschow :: Replies: **1** :: Views: **476**

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 :: 11-11-2012 01:28 :: mansibhargava :: Replies: **0** :: Views: **896**

You only have half a **gilbert** **cell** so you are unbalanced and will see some DC bias shift as well.
Assuming ideal transistors (no Early effect) and low input voltages to keep the linear range, there will be no bias, I think. The circuit is a standard gm **multiplier**, respectively single stage OTA with I/V converter.
A full balanced m

Analog Circuit Design :: 12-20-2011 18:57 :: FvM :: Replies: **6** :: Views: **1881**

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 14:46 :: rahulloveselectronics :: Replies: **2** :: Views: **1120**

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 07:41 :: FvM :: Replies: **4** :: Views: **2254**

Analog Circuit Design :: 08-02-2010 05:45 :: nnayak82 :: Replies: **1** :: Views: **1313**

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 12:19 :: FvM :: Replies: **11** :: Views: **6984**

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 16:18 :: sam244 :: Replies: **1** :: Views: **2376**

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 13:52 :: unkarc :: Replies: **19** :: Views: **25845**

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 :: 12-18-2006 03:21 :: zhangseong :: Replies: **1** :: Views: **1140**

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 17:21 :: VVV :: Replies: **6** :: Views: **4414**

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 07:04 :: Vamsi Mocherla :: Replies: **3** :: Views: **1477**

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 21:56 :: nxing :: Replies: **11** :: Views: **7622**

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 :: 07-19-2005 03:41 :: crystal :: Replies: **5** :: Views: **2063**

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 05:13 :: hanm :: Replies: **1** :: Views: **968**

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 22:32 :: bouchy :: Replies: **1** :: Views: **1152**

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 14:51 :: riz_aj :: Replies: **2** :: Views: **1623**

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