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Biasing two stage amplifier (Read 2024 times)

anhnha New Member Offline Posts: 6 Earth	Biasing two stage amplifier May 12^th, 2014, 2:58am Please help me with the question below about two stage amplifier. Thank you.
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Frank99 New Member Offline Posts: 7	Re: Biasing two stage amplifier Reply #1 - May 14^th, 2014, 2:24pm the CM upper limit of Vin is limited by the vgd voltage. when vg1 is raised above the vd1 by a vth1. M1 will go into triode. and vd1 = vdd-\|vth3\| therefore vin - (vdd-\|vth3\|) < vth1(include body effect) so vin must be < (vdd-\|vth3\|) + vth1 for M1 to remain in sat. what do you think?
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Hrishikesh New Member Offline Posts: 6	Re: Biasing two stage amplifier Reply #2 - May 15^th, 2014, 3:49am I think it should be vsg3 instead of \|vth3\|. vsg3 is set by the bias current, I5/2 depending on the W/L of M3.
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