Oscillator calibration method and circuit and radio with oscilla

Details Oscillator calibration method and circuit and radio with oscilla Oscillator calibration method and circuit and radio with oscilla

1998-07-30

2000-02-01

Mis, David

Oscillators

With frequency calibration or testing

331 47, 331 51, 331 54, 331 55, 331111, 331143, 331153, 331172, 331179, 455 671, 455 75, 455119, 4552261, 455257, G01R 2300, H03B 524, H03L 700

Patent

active

060207906

ABSTRACT:
In a method of calibration of a voltage controlled oscillator (VCO), the VCO (100) provides an output signal which is used to drive a dividing oscillator (10) such as a relaxation oscillator (RO). The RO has at least two states, one in which the RO provides an output signal which has a first frequency that is related to the VCO output signal by a first ratio (e.g. 1/N) and one in which the relaxation oscillator provides a RO output signal which has a second frequency that is related to the VCO output signal by a second ratio (e.g. 1/(N+1)). By measuring the first and second frequencies (and knowing the relationship between the first and second ratios), the VCO frequency is calculated and stored (110). Several VCO frequencies can be calculated and stored for several applied voltages. As a result the VCO can be driven to any selected frequency in the calibrated range and can be used to provide an injection frequency for a radio.

REFERENCES:
patent: 4347484 (1982-08-01), Vandegraaf
Brailove, Adam A., "The Dynamics of Two Pulse-Coupled Relaxation Oscillators", International Journal of Bifurcation and Chaos, vol. 2, No. 2, (1992), p. 341-352.
Alstrom, P., Christiansen, B., Levinsen, M., "Nonchaotic transition from Quasiperodicity to Complete Phase Locking", Physical Review Letters, vol. 61, No. 15, (1988), p. 1679-1682.
Brailove, Adam A., Linsay, Paul S., "An Experimental Study of a Population of Relaxation Oscillators with a Phase-Repelling Mean-Field Coupling", International Journal of Bifurcation and Chaos, vol. 6, No. 7, (1996), p. 1211-1253.

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