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Digital temperature compensation oscillator

  • US 5,170,136 A
  • Filed: 09/04/1991
  • Issued: 12/08/1992
  • Est. Priority Date: 09/14/1990
  • Status: Expired due to Fees
First Claim
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1. A digital temperature compensation oscillator for digitally compensating a variation in oscillation frequency due to temperatures, by applying a compensation voltage to a voltage controlled oscillator, said compensation oscillator comprising:

  • temperature detection means for detecting temperatures when the voltage controlled oscillator is operated, and generating a temperature signal;

    A/D conversion means for receiving the temperature signal, digitizing the temperature signal, and generating digital temperature data;

    memory means for storing compensation data corresponding to the compensation voltage as difference data at corresponding addresses, said difference data including, when N-stage level difference data (N=a positive integer) are utilized, predetermined reference values of 0th difference data to (N-1)-th difference data of said compensation data and all N-th data;

    operation means for receiving the digital temperature data and the difference data, and generating the compensation data on the basis of the difference data in response to the digital temperature data;

    D/A conversion means for receiving the compensation data, and converting the compensation data into an analog compensation voltage; and

    said voltage controlled oscillator including means for generating a compensated oscillation frequency in response to the analog compensation voltage.

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