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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> Differential pair with active current mirror and realistic current source https://designers-guide.org/forum/YaBB.pl?num=1504336936 Message started by blue111 on Sep 2nd, 2017, 12:22am |
Title: Differential pair with active current mirror and realistic current source Post by blue111 on 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-feedback-and-not-positive-feedback ? 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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