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RF variable gain tuned output amplifier which maintains high Q in saturation

  • US 5,343,162 A
  • Filed: 04/06/1993
  • Issued: 08/30/1994
  • Est. Priority Date: 04/06/1993
  • Status: Expired due to Term
First Claim
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1. An amplifier for amplifying to an output RF signals applied to an input, CHARACTERIZED BY:

  • a differential pair of transistors having a common output and two outputs and two inputs, the inputs coupling to the input of the amplifier and the two outputs coupling to the output of the amplifier;

    a current source coupling to the common output of the transistors;

    a resonant circuit connected between the two outputs of the transistors; and

    high impedance means having a high impedance to RF signals connected between the two outputs of the transistors and a power supply terminal to provide a path for current to the transistors;

    wherein RF signals on the two outputs of the differential pair of transistors are not bypassed to ground.

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