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Fully differential Amplifier class AB

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hannover90

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Hello all,
I designed a FDA with a common mode voltage of 0 V, but the dymamic range of both outputs are not exact symetry. For example, the dc values of vout1 and vout2 are -500 mV and +500 mV, but their values at rising/falling edge are at one point: -210mV and +201mV. Is this problem for functionality of FDA?
 

erikl

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I don't think that a 10% deviation is a problem. Did you check the asymmetry at large-signal output voltage?

Somewhere there is a (tiny) asymmetry in your FDA design. Is this the result of a pre- or a post-layout simulation? Without more info and a schematic we can't tell more abut this, I think.
 

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