Patent ID: 8872585
Filing Date: 2014-10-28
Classification: H03F,H03G

Abstract:
1. An amplifier configured to convert an unbalanced pair of input currents into a balanced pair of output voltages, comprising: a pre-amplifier configured to covert a portion of the input currents into output voltages, the pre-amplifier including two trans-impedance amplifiers (TIAs) each having a single phase arrangement to receive respective portions of the input currents; a level detector configured to detect an average level between the output voltages; a controller configured to amplify a difference between averages of each of the output voltages; and an offset canceller configured to bypass a rest of the input currents, wherein the controller adjusts a gain thereof depending on the average level between the output voltages, wherein the controller includes a differential circuit to amplify the difference between the average of each of the output voltages, and wherein the level detector controls a power supply provided to the differential circuit to vary the gain of the differential circuit.