Patent ID: 8139163

Claim:
A television (TV) link infrared (IR) demodulation circuit comprising: a reference voltage setting unit configured to set a first reference voltage and a second reference voltage, different from each other; and a differential amplifier configured to differentially amplify the first reference voltage received via a first input terminal and a voltage obtained by coupling an input signal with the second reference voltage, via a second input terminal, and configured to demodulate a remote control signal received via the second input terminal into a pulse signal, wherein the differential amplifier comprises: a first transistor having a fist terminal connected to receive the first reference voltage, a second terminal connected to receive an operating voltage, and a third terminal connected to a ground via a first resistor; and a second transistor having a first terminal connected to receive the second reference voltage and to receive the remote control signal, a second terminal connected to receive the operating voltage via a second resistor, and a third terminal connected to the third terminal of the first transistor.