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Crystal oscillator

  • US 4,142,161 A
  • Filed: 02/16/1978
  • Issued: 02/27/1979
  • Est. Priority Date: 02/16/1978
  • Status: Expired due to Term
First Claim
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1. A crystal oscillator circuit energized by a supply voltage source comprising:

  • a tuning fork crystal vibrator means for providing an oscillatory signal at a series resonant frequency of said vibratory means; and

    circuit means coupled to said crystal vibrator means comprising a direct-coupled amplifier having at least three FET stages for affording an inherent phase shift to the oscillatory signal at each FET stage and an additional predetermined phase shift to the oscillatory signal resulting from the interelectrode capacitance of each FET stage and resistance means for providing a regenerative feedback signal to said crystal vibrator means and for providing a DC bias stabilization feedback potential to a gate terminal of each FET stage for maintaining the oscillatory signal loop phase shift substantially constant with supply voltage variations.

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