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Signal processing device

  • US 5,267,023 A
  • Filed: 10/21/1991
  • Issued: 11/30/1993
  • Est. Priority Date: 11/02/1990
  • Status: Expired due to Term
First Claim
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1. A signal processing device for processing an information signal, comprising:

  • a) an input coupling capacitor arranged to receive the information signal;

    b) a differential amplifier arranged to convert the information signal input through said input coupling capacitor into a differential information signal and to output the differential information signal;

    c) a first balanced modulator arranged to perform a balanced-modulation process on the differential information signal output by said differential amplifier in accordance with a modulation carrier signal and to output a first balanced-modulated information signal;

    d) a second balanced modulator arranged to perform a balanced-modulation process on the first balance-modulated information signal and to output a second balanced-modulated information signal; and

    e) a differential current forming circuit arranged to convert a current of the second balance-modulated information signal output from said second balanced-modulator into a differential current and to supply the differential current to said input coupling capacitor.

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