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Current source type current output circuit using current mirrors

  • US 4,766,396 A
  • Filed: 08/07/1987
  • Issued: 08/23/1988
  • Est. Priority Date: 08/28/1986
  • Status: Expired due to Term
First Claim
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1. A current source type current output circuit for applying to a load a current which is proportional to an input, comprising:

  • an amplifier of a type receiving a current and producing a voltage; and

    a feedback circuit for feeding back an output of said amplifier to an input terminal of said amplifier;

    said feedback circuit comprising a first, a second, and a third current mirror circuit, and a first, a second, and a third resistor;

    an output terminal of said amplifier being connected to an input terminal of said second current mirror circuit via said third resistor and to an input terminal of said first current mirror circuit via a series connection of said first and second resistors;

    the load being connected to an intermediate point of said serial connection of said first and second resistors;

    an output terminal of said second current mirror circuit being connected to an input terminal of said third current mirror circuit;

    an output terminal of said first current mirror circuit and an output terminal of said third current mirror circuit being connected to said input terminal of said amplifier such that a current which is proportional to an input is fed to the load;

    a reference terminal of each of said first and second current mirror circuits being connected to a first power source, and a reference terminal of said third current mirror circuit being connected to a second power source.

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