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Power supply dependent input buffer

  • US 5,309,039 A
  • Filed: 09/29/1992
  • Issued: 05/03/1994
  • Est. Priority Date: 09/29/1992
  • Status: Expired due to Fees
First Claim
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1. A power supply dependent input buffer, comprising:

  • differential amplifier means for receiving an ECL level signal referenced to a first power supply voltage, and in response, providing first and second differential signals;

    an emitter-follower circuit, coupled to said differential amplifier, for receiving said first differential signal, and in response, providing a first level shifted signal;

    a first resistor, coupled to said emitter-follower circuit, for receiving said first level shifted signal, and in response, providing a second level shifted buffered signal, said second level shifted buffered signal referenced to a second power supply voltage; and

    current source means, coupled to said first resistor, for receiving a bias voltage, said bias voltage referenced to said first power supply voltage, said current source means providing a current for said first resistor, said current being proportional to said first power supply voltage.

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