Offset compensating method and circuit for MOS differential stag

Details Offset compensating method and circuit for MOS differential stag Offset compensating method and circuit for MOS differential stag

1996-12-30

1999-08-24

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327562, 36518524, 36518528, H03F 345

Patent

active

059429364

ABSTRACT:
To compensate the offset of a differential stage, the stage has at least one programmable, floating gate transistor with a programmable threshold, which is initially set to a threshold level other than the required threshold value, so that the differential stage is initially unbalanced. A balance input voltage is applied to the inputs of the differential stage. A programming voltage is applied to the programmable transistor to modify the set threshold until the differential stage switches. Upon switching, the programming voltage is cut off immediately, so that the charge required for the differential stage to be balanced with a balance input voltage is memorized in the programmable transistor.

REFERENCES:
patent: 5181188 (1993-01-01), Yamauchi et al.
patent: 5218568 (1993-06-01), Lin et al.
patent: 5430670 (1995-07-01), Rosenthal
patent: 5557234 (1996-09-01), Collins

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