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Infrared signal receiver with attenuating circuit

  • US 6,414,776 B1
  • Filed: 01/27/1999
  • Issued: 07/02/2002
  • Est. Priority Date: 01/30/1998
  • Status: Expired due to Fees
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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