Patent ID: 7567125
Filing Date: 2009-07-28
Classification: H03F

Abstract:
1. An apparatus including a differential amplifier with multiple signal gains for amplifying a differential input signal over a wide dynamic range, comprising: differential input electrodes to convey a differential input signal; differential output electrodes to convey a differential output signal; first differential amplifier circuitry having a first signal gain and coupled between said differential input and output electrodes to receive at least a first portion of said differential input signal and provide a first portion of said differential output signal, and including second differential amplifier circuitry having a second signal gain lower than said first signal gain and coupled between said differential input and output electrodes to receive at least a second portion of said differential input signal and provide a second portion of said differential output signal, and including wherein, over a predetermined range of values of said differential input signal, a ratio of said differential output signal to said differential input signal varies in relation to a continuous combination of said first and second signal gains.