Offset cancellation circuit

Details Offset cancellation circuit Offset cancellation circuit

1996-10-30

1998-08-18

Mottola, Steven

Amplifiers

With periodic switching input-output

330 69, H03F 345

Patent

active

057963010

ABSTRACT:
An offset cancellation circuit of this invention includes operational amplifiers 11, 12 having fully differential outputs and common mode output, and comprises an adder 15 supplied with one Vo.sup.+ 1 of the fully-differential outputs of the operational amplifier 11 and one Vo.sup.+ 2 of the fully-differential outputs of the operational amplifier 12 to add them to output added result, an adder 16 supplied with the other Vo.sup.- 1 of the fully-differential outputs of the operational amplifier 11 and the other Vo.sup.- 2 of the fully-differential outputs of the operational amplifier 12 to add them to output added result, an adder 13 supplied with common mode output Vcm1 of the operational amplifier 11 and common mode output Vcm2 of the operational amplifier 12 to add them to output added result, and a multiplier 14 for multiplying an output of the adder 13 by 1/2 to output it. Thus, it is possible to eliminate influence of error resulting from offset quantities existing in respective common mode output potentials in plural operational amplifiers having fully-differential outputs.

REFERENCES:
patent: 4633223 (1986-12-01), Senderowicz
patent: 5410274 (1995-04-01), Birdsall et al.
Proc. IEEE ISCAS, pp. 1363-1366, 1991, P. Wu, et al., "Design Considerations For Common-Mode Feedback Circuits in Fully-Differential Operational Transconductance Apmplifiers With Tuning".

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