On Wed, Sep 06, 2006 at 06:09:10AM -0400, Bob Paddock wrote: > On Wednesday 06 September 2006 03:36, Karel Kulhavy wrote: > > Anyone knows what exactly is called Gilbert cell? > > The Gilbert Cell is named after Barrie Gilbert of Analog Devices, > invented in 1968. > > http://www.ieee.org/organizations/pubs/newsletters/sscs/jan03/jssc_classic.html > > The Gilbert Cell has become common in RF designs, used as a double balanced > mixer. It is a four quadrant multiplier. Somewhere in my files I have a > paper > by Gilbert where he states that he never really meant it to be used the way, > that has been the most common usage. He recommended an obscure > division technique instead. I'll dig the paper up this evening. > > > How many transistors does it actually have? > > http://rfdesign.com/mag/503rfdf1.pdf > > > Is it possible to make a well working Gilbert cell with ordinary non-matched > > transistors? > > And btw do you know what translinear mean? > > One set of frequencies is translated linearly to an other set of frequencies. > Using non-matched transistors will not be linear, resulting in spurious > outputs. > > What is it you really need to do? If it is a simple AM demodulation you can
I thought I have Gilbert cells in my Ronja RX, but that was because someone somewhere incorrectly called a long-tail pair Gilbert cell. So I was wondering what is the actual Gilbert cell. CL< > make a Synchronous Demodulator out of 4000 family gates. There is also > a simple two transistor Synchronous Oscillator/Demodulator. Look at the > Application Note > section at http://www.unusualresearch.com/ . > > -- > http://www.softwaresafety.net/ http://www.designer-iii.com/ > > > > _______________________________________________ > geda-user mailing list > geda-user@moria.seul.org > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user