Patent ID: 7265615
Filing Date: 2007-09-04
Classification: H03F

Abstract:
1. A multiple differential amplifier system with transconductance mismatch compensation comprising: a main amplifier having a differential signal input and a differential feedback input; a null amplifier having a differential signal input and a differential switched input; a null storage device connected to an auxiliary input of said null amplifier; a main storage device connected to an auxiliary input of said main amplifier; a switching system for connecting to said differential switched input of said null amplifier to said differential signal input of said main amplifier inverted in a first phase for compensating for offset errors and transconductance mismatches in said null amplifier; and storing in said null storage device an output of said null amplifier representing compensation for the offset error and transconductance mismatch in said null amplifier; and in a second phase connecting said differential switched input of said null amplifier to said differential feedback input of said main amplifier, and storing in said main storage device the output of said null amplifier representing the compensation for the main amplifier offset error and transconductance mismatch error for compensating for the offset error and transconductance mismatch of said main amplifier.