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ali kotb New Member Offline Posts: 6	-ve resistance Mar 16^th, 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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GerryHickman New Member Offline Posts: 1 New York	Re: -ve resistance Reply #1 - Mar 16^th, 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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ali kotb New Member Offline Posts: 6	Re: -ve resistance Reply #2 - Mar 17^th, 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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Forum Administrator YaBB Administrator Offline Posts: 145	Re: -ve resistance Reply #3 - Mar 17^th, 2012, 9:12pm What is -ve resistance? -Ken
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Frank Wiedmann Community Fellow Offline Posts: 678 Munich, Germany	Re: -ve resistance Reply #4 - Mar 18^th, 2012, 3:45am Forum Administrator wrote on Mar 17^th, 2012, 9:12pm: What is -ve resistance? -Ken -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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HdrChopper

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Re: -ve resistance
Reply #5 - Mar 19^th, 2012, 8:00am

ali kotb wrote on Mar 17^th, 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 �

- 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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Keep it simple

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