Patent ID: 9035696
Filing Date: 2015-05-19
Classification: H03F

Abstract:
1. An amplifier for receiving a pair of complementary current signals and outputting a pair of complementary voltage signals, the amplifier comprising: a pair of trans-impedance amplifiers for receiving the complementary current signals and converting the complementary current signals into the complementary voltage signals; and a compensation circuit for compensating for an offset between the complementary voltage signals, wherein each of the pair of trans-impedance amplifiers comprises a resistor, a transistor, and a current source, which are connected in series to each other between a power source and a ground; wherein each of the pair of trans-impedance amplifiers outputs a voltage depending on a current flowing through the resistor and is changed by one of the complementary current signals flowing through the current source, as one of the complementary voltage signals; and wherein the compensation circuit receives the complementary voltage signals, and adjusts currents, which flow through the resistors, based on the offset between the complementary voltage signals, and reduces an offset between voltage drops at the resistors.