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Effective gm of an Rail to rail opamp

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Kiran K

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How to find the effective 'gm' of an opamp which has both p-type and n-type Differential amplifier..?
The effective gm when both p-type and n-type Differential amplifier are ON..

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kiran k
 

Plot small-signal output_current/input_voltage ratio vs. common mode voltage from ac analysis results, s. Fig. 3 from this rather ancient basic paper on R2R opamps:
 

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