Infrared signal receiver with attenuating circuit
First Claim
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1. An infrared signal receiver comprising:
- an infrared radiation sensor;
an amplifier for amplifying a signal received by said infrared radiation sensor;
a band-pass filter for extracting a predetermined frequency component from the signal amplified by said amplifier;
an attenuator for attenuating an output signal from said band-pass filter;
a detector including a differential amplifier composed of two transistors and a DC level shifter for being supplied with the output signal from said band-pass filter and an attenuated signal from said attenuator and adding a DC offset to a voltage which turns on said two transistors; and
a waveform shaper for shaping the waveform of an output signal from said detector.
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Abstract
An infrared signal receiver has an infrared radiation sensor, an amplifier, a band-pass filter, an attenuator, a detector, and a waveform shaper. An output signal from the band-pass filter and an attenuated signal from the attenuator are supplied to the detector. The detector has a DC level shifter which produces a DC offset from the output signal from the band-pass filter and the attenuated signal from the attenuator, and adds the DC offset, as a detecting threshold voltage, to a voltage which turns on and off transistors of a differential amplifier of the detector.
20 Citations
6 Claims
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1. An infrared signal receiver comprising:
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an infrared radiation sensor;
an amplifier for amplifying a signal received by said infrared radiation sensor;
a band-pass filter for extracting a predetermined frequency component from the signal amplified by said amplifier;
an attenuator for attenuating an output signal from said band-pass filter;
a detector including a differential amplifier composed of two transistors and a DC level shifter for being supplied with the output signal from said band-pass filter and an attenuated signal from said attenuator and adding a DC offset to a voltage which turns on said two transistors; and
a waveform shaper for shaping the waveform of an output signal from said detector. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification