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Temperature controlled crystal oscillator arrangement

  • US 4,560,959 A
  • Filed: 05/18/1983
  • Issued: 12/24/1985
  • Est. Priority Date: 05/18/1982
  • Status: Expired due to Term
First Claim
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1. A temperature compensated crystal oscillator arrangement, comprisinga crystal oscillator circuit including an oscillator crystal and having a frequency selective positive feedback path incorporating a frequency pulling control element;

  • anda temperature sensitive compensation circuit so connected to said feedback path as to drive said control element and includingtemperature sensing means operative for issuing an electrical output signal that is a monotonically varying function of temperature,power series function generator means connected to said temperature sensing means to receive said output signal therefrom and operative for generating a series of outputs that represent the terms of a Chebyshev-like polynomial function, the orders of the terms increasing from zero to the number of outputs less one,summing amplifier means having a plurality of inputs each receiving one of said outputs of said power series function generator means and operative for providing an output signal that is a weighted sum of said outputs of said power series function generator means, andmeans for applying said output of said summing amplifier means to said feedback path so as to drive said control element.

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