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Amplifier circuit and control signal generator

  • US 6,075,413 A
  • Filed: 03/02/1999
  • Issued: 06/13/2000
  • Est. Priority Date: 12/10/1997
  • Status: Expired due to Fees
First Claim
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1. An input circuit, comprising:

  • a pair of differential transistors provided with first and second transistors with emitters which are commonly connected and through which a collector current flows when there is no signal;

    a bias voltage source for biasing the base potential of each of the first and second transistors;

    an inputting means for differentially applying first and second input signal voltages superimposed on outputs of the bias voltage source to bases of the first and second transistors;

    an impedance circuit connected to the common emitters of the pair of differential transistors and provided with a differential resistor; and

    an outputting means for differentially obtaining output signals from the collector currents of the first and second transistors,wherein the product of the sum of collector currents of the first and second transistors when there is no signal and the differential resistor of the impedance circuit is set to a value of less than a thermoelectric voltage of the first and second transistors.

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