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Radio receiver with improved channel selection and reception

  • US 5,239,701 A
  • Filed: 11/13/1990
  • Issued: 08/24/1993
  • Est. Priority Date: 11/15/1989
  • Status: Expired due to Term
First Claim
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1. An RF amplifying circuit for a receiver for amplifying an incoming radio frequency signal from an antenna, comprising:

  • means for amplifying the incoming radio frequency signal,first gain controlling means coupled to the output of said amplifying means for controlling the level of an output signal from said amplifying means,second gain controlling means coupled to the output of said amplifying means for controlling the level of an output signal from said amplifying means,tuning means coupled to the output of said first gain controlling means for extracting a narrow band RF signal including a desired frequency region from said incoming radio frequency signal,first means coupled to the output of said second gain controlling means for generating a wide band RF signal from said incoming radio frequency signal,control means responsive to a channel selecting instruction for setting said first and second gain controlling means in opposite operational states, andselection means responsive to the output of said control means for selectively passing one of said narrow band RF signal and said wide band RF signal to down-stream circuitry, said selection means passing said wide band RF signal during a channel selection and passing said narrow band RF signal after the completion of the channel selection.

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