Patent ID: 7009448
Filing Date: 2006-03-07
Classification: G11C,H03F,H03H

Abstract:
1. An operational amplifier circuit, comprising: a first inverted amplifier circuit that receives a first input signal; a second inverted amplifier circuit that receives a second input signal; a first non-inverted amplifier circuit that receives a common-mode input signal, a second non-inverted amplifier circuit that receives the common-mode input signal, a third inverted amplifier circuit that receives an estimated common-mode output signal and a sum of the output signal of the first non-inverted amplifier and the output signal of the first inverted amplifier circuit, and outputs a first output signal and a second output signal; and a fourth inverted amplifier circuit that receives the estimated common-mode output signal and a sum of the output signal of the second non-inverted amplifier and the output signal of the second inverted amplifier circuit, and outputs a third output signal and a fourth output signal, wherein adding the second output signal and the fourth output signal creates the estimated common-mode output signal.