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The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> -ve resistance https://designers-guide.org/forum/YaBB.pl?num=1331947177 Message started by ali kotb on Mar 16th, 2012, 6:19pm |
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Title: -ve resistance Post by ali kotb on Mar 16th, 2012, 6:19pm how to draw a -ve resistance across cross coupled mosfets? how to draw the locus diagram of this impedance (imag. vs real)? thnx |
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Title: Re: -ve resistance Post by GerryHickman on Mar 16th, 2012, 10:27pm Can you show me your diagram?? so that it is very easy to tell you exactly how to draw it. |
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Title: Re: -ve resistance Post by ali kotb on Mar 17th, 2012, 2:17pm here is the ct. i want to find out the value of -ve resistance across c0 cap and to be able to draw it vs frequency also i need to draw the locus of this impedance(polar diagram) thank u |
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Title: Re: -ve resistance Post by Forum Administrator on Mar 17th, 2012, 9:12pm What is -ve resistance? -Ken |
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Title: Re: -ve resistance Post by Frank Wiedmann on Mar 18th, 2012, 3:45am Forum Administrator wrote on Mar 17th, 2012, 9:12pm:
-ve and +ve seem to be relatively common abbreviations for negative and positive, respectively (see http://en.wiktionary.org/wiki/-ve and http://en.wiktionary.org/wiki/%2Bve). |
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Title: Re: -ve resistance Post by HdrChopper on Mar 19th, 2012, 8:00am ali kotb wrote on Mar 17th, 2012, 2:17pm:
- Bias the circuit right at the point where current on both branches are exactly balanced. - In AC open the circuit at the differential nodes where you want to measure the resistance (drains of x-coupled gates devices) - Apply a differential AC current of 1A magnitude and measure the voltage magnitude and phase as a difference between both drains of x-coupled gates devices. That voltage should be the resistance you are looking for. |
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