1000 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
Analog IC Design and Layout :: 08-27-2014 00:22 :: m.afzal :: Replies: 1 :: Views: 179
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 :: 11-10-2012 20:28 :: mansibhargava :: Replies: 0 :: Views: 524
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: 6250
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 :: 12-04-2006 12:21 :: VVV :: Replies: 6 :: Views: 2896
do pls only "gilbert cell" simple into google :-):
You will have lot of other good answers too..
Electronic Elementary Questions :: 06-04-2010 17:43 :: karesz :: Replies: 11 :: Views: 1132
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 :: 08-02-2010 01:45 :: nnayak82 :: Replies: 1 :: Views: 804
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 :: 10-11-2011 10:46 :: rahulloveselectronics :: Replies: 2 :: Views: 678
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.
Analog Circuit Design :: 11-22-2013 12:42 :: keith1200rs :: Replies: 9 :: Views: 614
For a 0.18um MOS gilbert cell mixer, simulations show me that the drain current of the switching pair is not a sqare wave, but something like a half sinusoidal curve, the peak is not flat, no matter how i increase the LO power. Therefore it consists of not only the odd order harmonics, but also even order harmonics. i want to know how t
RF, Microwave, Antennas and Optics :: 02-11-2004 18:54 :: BigBoss :: Replies: 2 :: Views: 1360
Hi all I am currently interested in the gilbert cell mixer and wonder
how it is supposed to be driven....
The L.O. is fed to the dubble differrential. Should they be driven into saturation ?
The dubble differential is cascoded on a single differential to where the RF is fed. Saturation driven ?
Perhaps somebody has a reference to a unbala
RF, Microwave, Antennas and Optics :: 07-25-2004 05:11 :: StoppTidigare :: Replies: 1 :: Views: 1323
I'm looking to design a gilbert cell mixer with major focus on minimizing the Noise Figure while have a decent gain value. Can anyone suggest a transistor for this application which would have model paramaters in ADS. The RF will be at 12GHz.
Electromagnetic Design and Simulation :: 10-06-2004 21:02 :: mesalem :: Replies: 0 :: Views: 579
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 :: 10-29-2004 13:18 :: riz_aj :: Replies: 6 :: Views: 2202
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: 1346
There two way to implement baluns:
1. passive. Like inductors there are some coupled spirals, commonly on same metal layer, hard to design (electromagnetic simulator)
2. active. Of course in this case linearity can be a problem.
In BiCMOS the gilbert cell is really popular and the most used. In CMOS both are used. The circuits have really diff
RF, Microwave, Antennas and Optics :: 12-21-2004 10:46 :: Mazz :: Replies: 24 :: Views: 3370
how to calculate the intermodulation distortion of gilbert cell mixer?
RF, Microwave, Antennas and Optics :: 03-10-2005 19:10 :: zeshan102 :: Replies: 1 :: Views: 768
I'd like to design a differential input XOR circuit using the FOLDED gilbert cell
for phase detector, how to get starting to design the circuit? input signal is LVPECL
Vcm=2v, swing Vpp=800mv. 3.3v rail.
anyone with experience of this kind of ckt can tell me how to design this one like
(1) Bias current distribution
(2) input commo
Analog IC Design and Layout :: 04-14-2005 03:18 :: jxzhang :: Replies: 0 :: Views: 887
I want to compute IIP3 of a gilbert cell mixer very fast just with MATLAB.
I have just voltage and current of nodes.
can u help me ?
RF, Microwave, Antennas and Optics :: 07-24-2005 01:51 :: hr_rezaee :: Replies: 0 :: Views: 1019
i have done my gilbert cell mixer layout using L-edit from tanner. all i have is tspice version 11. can somebody help me in simulation. beside dc operation point analysis dan transient analysis, can somebody tell me what simulation i have to to compute my mixer gain and freq response. i really dont know at what frequency my mixer can operate. pleas
RF, Microwave, Antennas and Optics :: 03-03-2006 03:29 :: evilguy :: Replies: 12 :: Views: 2303
How can i determine the right LO power level for gilbert cell mixer?
RF, Microwave, Antennas and Optics :: 07-04-2006 11:54 :: bouchy :: Replies: 3 :: Views: 1142
I am designing a low voltage(1.8V) gilbert cell mixer, which includes(from bottom to top) tail current mos, RF input mos, LO switching mos, and resistive load. Since LO has large amplitude, there would be a large common-mode second harmonic of LO at the drain of RF input mos, which may cause the RF input mos to go into triode region, or even feed t
RF, Microwave, Antennas and Optics :: 07-26-2006 11:07 :: ezbentley :: Replies: 3 :: Views: 1400
I am designing a Phase Detector for a PLL. I use CMOS for my gilbert cell. The problem is I cannot derive the expression of Vout as a function of the product of the 2 inputs (Vout = K Vi x Vo ).
Anyone could guide me how to get the above equation?
(all the documents I found are for BJTs gilbert cell, i (...)
Analog Circuit Design :: 10-04-2006 09:26 :: ericnguyen :: Replies: 4 :: Views: 1497
How can i optimz the gilbert cell Mixer ,
in terms of power ,speed ,and area.
i am using gilbert cell Mixer from gilbert cell Mixer Design Tutorial )
Analog IC Design and Layout :: 06-06-2007 05:06 :: manish12 :: Replies: 2 :: Views: 1790
I would like to ask how we compute the power consummation in gilbert cell Mixer.
I think that we should compute the product Ibias * Vdd
For exemple if Ibias=6mA and Vdd=1.8V, then Power=10.8mW
Is it tru?
RF, Microwave, Antennas and Optics :: 07-10-2007 04:27 :: Foufou :: Replies: 2 :: Views: 497
Can I get the design steps for the gilbert cell down conversion mixer??
Thanks in advance........
Analog Circuit Design :: 02-28-2008 16:11 :: chintalaudaykumar :: Replies: 8 :: Views: 1500
I am trying to design a broadband gilbert-cell mixer based on HBT,like BW of 2-3 there any idea about such a broadband mixer?
RF, Microwave, Antennas and Optics :: 06-19-2008 04:49 :: symsnowfairy :: Replies: 0 :: Views: 523
Excuse me, for bias of gilbert-cell mixer, what is optimum Vbe of LO transistors? How could I bias them to realize switches?
Thanks in advance!
RF, Microwave, Antennas and Optics :: 07-10-2008 04:18 :: symsnowfairy :: Replies: 4 :: Views: 1635
In the mixer chapter you will find information about expected gilbert cell performance
Microwave Circuit Design Using Linear and Nonlinear Techniques, Second Edition, by George Vendelin, Anthony M. Pavio, Ulrich L. Rohde, published by John Wiley & Sons, New York, NY, May, 2005, ISBN 0-471-41479-4.
RF, Microwave, Antennas and Optics :: 03-24-2009 08:34 :: N1UL :: Replies: 3 :: Views: 1538
Read this tutorial
RF, Microwave, Antennas and Optics :: 04-21-2010 17:47 :: alperuslu :: Replies: 2 :: Views: 864
I am designing a gilbert cell mixer.But its not working output I am not getting the exact output means I am not getting the down converted frequency and output is no longer amliplified version of input.Gain is decreases.even in the output I am getting the freq of local oscillator not of the converted frequency.I am attaching my co
RF, Microwave, Antennas and Optics :: 05-04-2010 03:21 :: sapnak8 :: Replies: 0 :: Views: 736
if you expand the large signal characteristic e.g. Ic=IT*tanh(Vin/Vt) into power series, you'll find the coefficient of linear polynom of this equation.Then you can predict nth order nonlinearity of the gilbert cell..
RF, Microwave, Antennas and Optics :: 11-05-2010 23:12 :: BigBoss :: Replies: 3 :: Views: 798
I have some question about designing of gilbert cell.
1- what are RF power and LO power affect in the cirtcuit?
2- how can I choise them? ( what are the best value for them? )
RF, Microwave, Antennas and Optics :: 11-21-2010 11:02 :: laperla :: Replies: 9 :: Views: 613
can anybody post design methodology of a gilbert cell?These are specs I'm targetting at
Swing = Vdd/5
Vctrl sweep -Vdd/2 to Vdd/2
Vp > 0.2
I'm working at 90nm technology node(with vdd=1.2)
Analog IC Design and Layout :: 03-26-2011 07:44 :: Ravinder487 :: Replies: 0 :: Views: 577
I am planning sdr as my final year project. I want to receive signals upto 108MHz. I have few doubts
1. Can I use gilbert cell mixer for this application and what would be the max rf frequency that could be downconverted with it
2. What should be the sampling rate of the adc
3. How do I interface
adc with pc - fpga or microcontroller?
Digital communication :: 04-03-2011 07:45 :: Ron1024 :: Replies: 0 :: Views: 640
I just want to know can gilbert cell be used as peak detector?
RF, Microwave, Antennas and Optics :: 08-25-2011 13:30 :: bouchy :: Replies: 1 :: Views: 344
I'm looking for discrete/ic based solutions for measuring the phase difference between current and voltage on the mains. At the moment i'm looking at the gilbert cell which i'm not very familiar with. If i'm using the gilbert cell for phase measurement does it output a linear analog signal representing the phase (...)
Analog Circuit Design :: 08-17-2012 20:17 :: steinar96 :: Replies: 2 :: Views: 582
from a paper I know that the gain of the gilbert cell (see picture) is as follows: A = (2*gm1/(gm1+gm2)-1)*gm56*Rout. However, I'm not able to understand why, especially the first part in parentheses... Pls help me =(
Analog Circuit Design :: 08-08-2013 06:05 :: Arielle :: Replies: 0 :: Views: 482
can anybody tell in gilbert cell downconversion mixer RF bandwidth depends on what..... actually i want to design a downconversion mith RF BW 300M to 3G. at low frequency how should i tuned circuit.(300M to 1G). above 1 GHz it is Ok . i designed that
Analog Circuit Design :: 02-24-2014 02:18 :: nisha gupta :: Replies: 0 :: Views: 241
I'm simulating a gilbert cell in Microwave Office but I'm not getting the desired output waveforms.
My waveforms look like this
but I'm trying to get them to look like this
I'm sure it has got to do with the way the transistors are biased but I'm not sure what resistor va
RF, Microwave, Antennas and Optics :: 06-12-2014 14:13 :: biker.josh07 :: Replies: 0 :: Views: 172
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 :: 03-02-2005 17:32 :: bouchy :: Replies: 1 :: Views: 896
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 :: 12-05-2008 01:58 :: FvM :: Replies: 4 :: Views: 3475
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 :: 03-21-2009 12:18 :: sam244 :: Replies: 1 :: Views: 1834
The NE602 and NE612 are mixers containing a gilbert cell and they are
Analog Circuit Design :: 04-26-2004 14:54 :: Tornado :: Replies: 7 :: Views: 2157
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: 742
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: 1791
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: 957
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 :: 12-13-2010 03:10 :: steinar96 :: Replies: 5 :: Views: 427
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 :: 12-28-2010 13:37 :: FvM :: Replies: 4 :: Views: 645
A common way to do analog multiplication is with a gilbert cell.
Analog Circuit Design :: 02-07-2013 13:33 :: crutschow :: Replies: 1 :: Views: 268
Where can I find the steps required to design a double balanced CMOS gilbert Mixer.
Electromagnetic Design and Simulation :: 04-16-2004 12:10 :: Puah Tin Peng :: Replies: 3 :: Views: 3395
In a CMOS double balanced gilbert cell mixer, because M3 to M6 are operating as a switch, is baised at Vds = Vgs - Vt.
M3 to M6 have the same devices characteristics(W/L , Cox and so on) and since 2 of the FET are operating at any time with their drain current being equal, their drain current is Iss/2. Iss being the current from Vdd.
Electromagnetic Design and Simulation :: 04-21-2004 22:50 :: Puah Tin Peng :: Replies: 0 :: Views: 810