Distributed transmitter output power control circuit and method for a radio telephone

  • US 5,752,172 A
  • Filed: 08/16/1996
  • Issued: 05/12/1998
  • Est. Priority Date: 08/16/1996
  • Status: Expired due to Term
First Claim
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1. A transmitter circuit for use in a radio telephone, comprising:

  • a power amplifier having an output coupled to an antenna for transmitting an amplified modulated RF signal;

    a variable gain driver amplifier having an output coupled to an input of said power amplifier and an input coupled to an output of a modulator, said variable gain driver amplifier being required to output the modulated RF signal within a predetermined dynamic power range having a maximum value; and

    at least one programmable gain amplifier coupled in series between said output of said modulator and said input of said variable gain driver amplifier, wherein said at least one programmable gain amplifier has a dynamic range selected for reducing the dynamic range requirement of said variable gain driver amplifier to be less than the maximum value of the predetermined dynamic power range.

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