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Radio communication apparatus with expanded dynamic range

  • US 5,689,814 A
  • Filed: 08/17/1994
  • Issued: 11/18/1997
  • Est. Priority Date: 08/20/1993
  • Status: Expired due to Fees
First Claim
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1. A radio communication apparatus comprising:

  • a first signal path including at least one first amplifier for amplifying a signal, at least one second amplifier for amplifying an output of said at least one first amplifier, and at least one first detector for detecting said amplified signal;

    a second signal path connected to an input portion of said first signal path including at least one third amplifier for amplifying said signal, and at least one second detector for detecting said amplified signal output from said at least one third amplifier;

    a signal strength detector circuit connected to said first and second signal paths for adding said detected signal of said first detector and said detected signal of said second detector;

    wherein said at least one first amplifier includes a pair of transistors having emitters and collectors, respectively;

    collector resistors connected to the collectors of said respective transistors; and

    a current source directly connected to said emitters, said at least one first amplifier performing differential operation;

    said at least one second amplifier includes a pair of transistors having collectors and emitters, respectively;

    collector resistors connected to the collectors of said respective transistors;

    emitter resistors connected to the emitters of said respective transistors; and

    a current source connected to said emitter resistors, said at least one second amplifier performing differential operation; and

    said at least one third amplifier includes a pair of transistors having collectors and emitters, respectively;

    collector resistors connected to the collectors of said respective transistors;

    emitter resistors connected to the emitters of said respective transistors; and

    a current source connected to the emitter resistors, said at least one third amplifier performing differential operation.

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