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Design >> Analog Design >> Differential Amplifier simulation using Synopsys Hspice
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Message started by ehsanaiman on Sep 25^th, 2017, 9:15pm

Title: Differential Amplifier simulation using Synopsys Hspice
Post by ehsanaiman on Sep 25^th, 2017, 9:15pm

Hello,
I want to ask some questions on this differential amplifier circuit that I referred in article "Design of CMOS Two-stage Operational Amplifier for ECG Monitoring System Using 90nm Technology by Moulahcene F Bouguechal N Benacer I Hanfoug S".

1. Can somebody explain to me about current mirror operation in simpler words?
2. If I want to build and simulate the schematic, do I need to add dc current source Iref in my schematic?
3. Iref is input current or current produced by current mirror?

Im using Hspice with 90nm technology. Thank you.

Title: Re: Differential Amplifier simulation using Synopsys Hspice
Post by jdp on Oct 28^th, 2017, 11:24pm

1. current mirror operation - read any textbook (e.g., CMOS book of RJ Baker, Wiley pub.)

2 & 3. You can start with an ideal idc source for initial simulations, but for practical implementation, you need a current sink (which can be a current mirrored from a current ref. ckt, see RJ Baker's book for example).