Phase locked loop circuit responding to supplied signal frequenc

Details Phase locked loop circuit responding to supplied signal frequenc Phase locked loop circuit responding to supplied signal frequenc

1991-03-06

1991-12-24

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 25, 331 34, H03L 700

Patent

active

050756400

ABSTRACT:
A phase locked loop circuit, which is arranged for receiving a first signal having a given frequency and producing a second signal which has the same frequency and is synchronous with the first signal, comprises control voltage generating means for generating a control voltage responding to a phase difference and a frequency difference between the first and second signals, a voltage controlled oscillator containing a ring oscillator having a multiplicity of the rows of inverters for producing a frequency output which is primarily determined by the control voltage, and a quantity-of-rows changing means for automatically changing the quantity of the inverters rows in the ring oscillator according to the control voltage.

REFERENCES:
patent: 4988960 (1991-01-01), Tomisawa

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