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Parasitic signal suppression circuit for an extremely high frequency oscillator

  • US 5,214,395 A
  • Filed: 11/22/1991
  • Issued: 05/25/1993
  • Est. Priority Date: 06/29/1991
  • Status: Expired due to Term
First Claim
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1. A parasitic signal suppression circuit for an extremely high frequency (EHF) local oscillation device having an EHF oscillator, comprising:

  • a first direct current cut-off device connected between an output of said EHF oscillator and an input of an amplifier;

    a first low-pass filter coupled at one end thereof between said first direct current cut-off device and said amplifier and coupled to a direct current power source at the other end thereof for supplying said direct current power source to said amplifier;

    a second direct current cut-off device connected between an output of said amplifier and an output of said EHF local oscillation device; and

    a second low-pass filter coupled at one end thereof between said output of said amplifier and said second direct current cut-off device and coupled to a direct current supply source at the other end thereof for supplying said direct current supply source to said amplifier;

    wherein said first and second direct current cut-off devices are composed of parallel resonators having a cut-off frequency matching an intermediate frequency band frequency of a device in which said EHF local oscillation device is provided;

    said parasitic signal suppression circuit suppressing a parasitic signal at the output of said EHF oscillator from being transmitted to said output of the EHF local oscillation device and simultaneously passing a desired main signal to said output of said EHF local oscillation device.

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