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Differential pair with active current mirror and realistic current source (Read 940 times)
blue111
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Differential pair with active current mirror and realistic current source
Sep 2nd, 2017, 12:22am
 
Hi, I am stuck at one analog circuit problem. So far my friends could not solve it.

This is a gyrator made up of two gm-cells (X1 and Gm2 blocks),  transforming CL into active inductor.

equivalent inductance value, Leq = CL / [(gm of X1 circuit block)*(gm of Gm2 circuit block)]

1) Should I simulate the value of overall transconductance of Gm2 circuit block independently or inside the larger circuit with the presence of Cs and CL  ?

2) Why would V(IN) = Vb ? is it because of https://www.quora.com/Why-does-an-op-amp-show-virtual-short-during-negative-feed... ?

Note: V(IN) is the gate voltage node of mosfet M6 in Gm2.sch
and X1 is just a CMOS inverter









Note: The complete gschem schematics and ngspice simulation plots could be obtained from https://github.com/promach/frequency_trap
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« Last Edit: Sep 02nd, 2017, 7:20am by blue111 »  
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