Larry W Larson

US Patent:

6828858, Dec 7, 2004

Filed:

Apr 12, 2002

Appl. No.:

10/123097

Inventors:

Larry Larson - La Jolla CA
Chengzhou Wang - La Jolla CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

H03F 316

US Classification:

330277, 330292

Abstract:

To an existing class AB amplifier receiving at a gate of one of a NMOS or a PMOS type CMOS transistor an input signal, the gate of this CMOS transistor having a nonlinear gate capacitance with its switched operation, is added another, opposite-type, one of a NMOS or a PMOS type CMOS transistor that also receives at its gate the same input signal. The nonlinear gate capacitance of this other CMOS transistor is essentially opposite to the nonlinear gate capacitance of the existing CMOS transistor that receives the input signal within the class AB amplifier. This other transistor serves to compensate for the nonlinear gate capacitance of the existing CMOS transistor. Any nonlinearity due, in particular, to any nonlinear change in gate capacitance of a CMOS transistor that is used in particular within a class AB amplifier is thus substantially canceled.