DC-offset canceler circuit and method for using the circuit

A dc-offset canceler circuit is provided, which cancels a dc offset more effectively. This circuit includes a first differential pair of emitter-coupled first and second bipolar transistors driven by a first constant current source/sink, and a second differential pair of emitter-coupled third and fourth bipolar transistors driven by a second constant current source/sink. The first and second differential pairs are coupled by a coupling capacitor. An emitter of a fifth bipolar transistor is connected to the emitters of the first and second transistors. An emitter of a sixth bipolar transistor is connected to the emitters of the third and fourth transistors. Bases of the first and fifth transistors are connected to a first input terminal. A base of the second transistor is connected to the first input terminal through a first resistor. Bases of the fourth and sixth transistors are connected to a second input terminal. A base of the third transistor is connected to the second input terminal through a second resistor. Collectors of the first, third, and sixth transistors are connected to a first output terminal, and those of the second, fourth, and fifth transistors are connected to a second output terminal.