Voltage-controlled oscillator with rapid tuning loop and method

Details Voltage-controlled oscillator with rapid tuning loop and method Voltage-controlled oscillator with rapid tuning loop and method

1989-12-20

1991-06-11

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 16, 331 17, 331 25, 331 30, H03L 7085

Patent

active

050235729

ABSTRACT:
An oscillator circuit is coupled to receive first and second reference signals and includes a voltage-controlled oscillator for generating an oscillating signal. A difference frequency calculation circuit is coupled to the voltage-controlled oscillator to produce a count signal corresponding to a difference in frequency between the oscillating signal and the first reference signal. A feedback circuit is coupled to the difference frequency calculation circuit and coupled to receive the second reference signal which corresponds to a predetermined frequency for the oscillating signal. The feedback circuit provides a control signal as an input to the voltage-controlled oscillator to control the frequency of the oscillating signal. The method for tuning the voltage-controlled oscillator which generates the oscillating signal includes a step of calculating a difference in frequency between the oscillating signal and a first reference signal, and generating a count signal corresponding to the difference in frequency. The count signal is compared to a reference count signal corresponding to a predetermined frequency for the oscillating signal, and an error signal is generated based on the results of the comparison. The error signal and a prepositioning signal corresponding to the predetermined frequency for the oscillating signal are added to generate a control signal which is provided to the voltage-controlled oscillator to control the frequency of the oscillating signal.

REFERENCES:
patent: 3611175 (1971-10-01), Boelke
patent: 4409563 (1983-10-01), Vandegraaf
patent: 4426627 (1984-01-01), Yoshisato et al.

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