Phase locked loop for use with discontinuous input signals
AssigneeClarion Co., Ltd.
InventorsHiroshi Osaka, Akira Honma, Yoshio Kizaki
Life of this patent
Estimating the term…
Abstract
A PLL circuit which comprises a phase comparator, a voltage-controlled oscillator whose oscillation frequency is controlled by an output from the phase comparator, a flip-flop circuit adapted to be set by an input signal, and a counter circuit responsive to an output condition of the flip-flop circuit to count an output from the voltage-controlled oscillator. The flip-flop circuit is adapted to be reset by an output from the counter circuit, and the phase comparator is adapted to receive an output from the flip-flop circuit and the output from the voltage-controlled oscillator.
Claims4
A PLL circuit which comprises a phase comparator circuit;
- a voltage-controlled oscillator circuit whose oscillation frequency is controlled by an output from said phase comparator circuit;
- a counter circuit for counting an oscillation ouptut from said voltage-controlled oscillator circuit;
- and a control means responsive to an input signal to provide the oscillation output of the voltage-controlled oscillator circuit to said counter circuit and to stop, by a count output from said counter circuit, the provision of said oscillation output, said phase comparator circuit being adapted to compare a phase of an output from said control means produced in response to said input signal with that of the oscillation output from said voltage-controlled oscillator circuit.
Dependencies are inferred from the claim text.