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Crystal oscillator with AGC and on-chip tuning

  • US 6,052,036 A
  • Filed: 10/31/1997
  • Issued: 04/18/2000
  • Est. Priority Date: 10/31/1997
  • Status: Expired due to Term
First Claim
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1. A crystal controlled oscillator circuit comprising:

  • an oscillator amplifier having an input and an output, said input being connected to a crystal resonator for establishing oscillation in a preselected frequency range;

    means for rectifying the output signal from said oscillator amplifier;

    means for capacitively coupling the output of said oscillator amplifier to said rectifying means;

    means for low pass filtering the output signal from said rectifying means to produce a d.c. signal proportional to the amplitude of the output of said oscillator amplifier;

    a feedback loop for connecting said d.c. signal from said low pass filtering means back to a current source of said oscillator amplifier to regulate the amplitude level of the oscillator amplifier output to a preselected value and limit power consumption of said oscillator circuit; and

    means for tuning said oscillator amplifier in response to variations in absolute temperature of said oscillator circuit.

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