Digital automatic frequency control of pure sine waves

Details Digital automatic frequency control of pure sine waves Digital automatic frequency control of pure sine waves

1988-12-16

1990-03-20

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, H03L 700

Patent

active

049104705

ABSTRACT:
There is provided a method of and apparatus for Automatic Frequency Control (AFC) of pure sine waves (PSW). It comprises discriminating to detect frequency differences between a received pure sine wave and a reference frequency, integrating the frequency differences to average the differences, and adjusting the reference frequency to eliminate the frequency difference. It is further characterized by digitizing, in quadrature, the received pure sine wave, mixing the received pure sine wave with a complex sinusoid to translate the pure sine wave to baseband, quadrature filtering the mixed sine wave, cross-product discriminating to detect frequency differences between a received pure sine wave and a reference frequency, integrating the frequency differences to average the differences, selectively calculating the mean variance between the pure sine wave and the reference frequency, and adjusting the reference frequency of a Voltage Controlled Oscillator to eliminate the frequency difference.

REFERENCES:
patent: 3403355 (1968-09-01), Takada
J. C. Samuels, "Theory of the Band-Centering AFC System", IRE Transactions on Circuit Theory, pp. 324-330, Dec. 1957.

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