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Process and circuit arrangement for amplifying an input current

  • US 4,639,134 A
  • Filed: 06/05/1984
  • Issued: 01/27/1987
  • Est. Priority Date: 06/15/1983
  • Status: Expired due to Term
First Claim
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1. A process for amplifying a photoelectric current generated by a photoelectric transducer and present at the input of a circuit arrangement including a feedback-coupled operational amplifier, comprising:

  • (a) forming two virtually equal voltages by passing the current from said photoelectric transducer through a first impedance to provide a first voltage at an input of the amplifier and producing a virtually identical voltage at an output of said amplifier;

    (b) forming two current paths having a common connection point, the current in one current path being determined solely by the photoelectric transducer independently of said operational amplifier, while the current in the other current path is determined by impressing said virtually identical voltage at the output of said amplifier across a second impedance; and

    (c) adding the currents of the two current paths at said common connector point to produce an output current greater than that produced by said photoelectric transducer, said output current being a function of the ratio of the first and second impedances as well as the magnitude of the current generated by the photoelectric transducer.

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