Television link infrared modulation circuit
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsYoung Sik Ryu, Chang Kap Nam, Hyo Young Maeng
Life of this patent
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Abstract
A television (TV) link infrared (IR) demodulation circuit including: a reference voltage setting unit setting a first reference voltage and a second reference voltage, different from each other; and a differential amplifier differentially amplifying 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 demodulating a remote control signal received via the second input terminal into a pulse signal.
Claims11
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.
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;
- 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;
- and
- an output buffer circuit part configured to output the pulse signal from the differential amplifier, wherein
- the first reference voltage is set to be higher than the second reference voltage and to be lower than a sum voltage of the second reference voltage and a maximum positive voltage of the remote control signal, and
- the differential amplifier comprises:
- a first transistor having a first 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.
Dependencies are inferred from the claim text.