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Subject: Re: Differential Amplifier
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Date: 08/25/03 at 1:54 PM
Posted by: Russ Kincaid
E-mail: russlk-nospam[AT55]yahoo.com (replace [AT55] with @ to reply)
In Reply to: Re: Differential Amplifier posted by Jason on 08/25/03 at 10:52 AM:
If you use N-type for Q3 and Q4, the gates must be tied to a positive voltage (common gate configuration). With Q3 gate connected to the source, Q3 is shut off and no current can flow thru Q1. This will pull the gate of Q4 down so no current flows thru Q2 and Vout falls to the lowest voltage available.
The N-mos drain must be positive relative to the source.
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