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AGC circuit for burst signal

  • US 5,452,332 A
  • Filed: 01/19/1994
  • Issued: 09/19/1995
  • Est. Priority Date: 01/20/1993
  • Status: Expired due to Term
First Claim
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1. An AGC circuit for burst signal comprising a quasi-synchronization demodulator for receiving an intermittently transmitted burst modulation signal and demodulating said burst modulation signal to a baseband signal, two analog-to-digital converters for converting the output signal of said quasi-synchronization demodulator to a digital signal, a first multiplier for receiving the output signals of said analog-to-digital converters and an integrator and executing a multiplying operation, two square circuits for squaring the output signal of said first multiplier, an adder circuit for adding the output signal of said square circuits, a digital subtractor for subtracting a predetermined reference signal from the output of said adder circuit, an area decision unit for deciding three different areas defined by comparing a first and a second reference predetermined values with the level of said subtractor output signal, a selector for selecting one of predetermined three different loop constants K1, K2 and K3 based upon the output signal of said area decision unit, a second multiplier for multiplying the output signals of said selector and said subtractor, and the integrator for integrating the output signal of said second multiplier to drive said first multiplier thereby, said loop constants K1, K2 and K3 being related as K1>

  • >

    K2≧

    K3, said first reference value being set to be greater than said second reference value, said selector selecting said loop constant K1 when the output signal of said subtractor is greater than said first reference value, selecting said loop constant K3 when the output signal of said subtractor is less than said second reference value and selecting said loop constant K2 when the output signal of said subtractor has an intermediate value between said first and second reference values.

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