Patent ID: 8610495

Claim:
A demodulator circuit, comprising: a transimpedance amplifier configured to receive an input signal having out-of-band transmitted signals, comprising: a first operational amplifier having an input terminal and an output terminal; a first RC feedback network extending from the output terminal to the input terminal; a negative feedback network extending from the transimpedance amplifier to an input terminal of the transimpedance amplifier, wherein the negative feedback network is configured to provide a negative feedback signal for common mode and differential input signals that suppresses out-of-band-transmitted signals within the input signal, and wherein the negative feedback network comprises a negative feedback filtering element configured to provide the negative feedback signal having a frequency corresponding to a frequency of the out-of-band transmitted signals; one or more switches connected between an internal node of the first operational amplifier and the negative feedback filtering element; and a control unit configured to generate a control signal that selectively opens and closes the one or more switches to connect or disconnect the negative feedback network from the transimpedance amplifier.