VCO controlled by separate phase locked loop

Details VCO controlled by separate phase locked loop VCO controlled by separate phase locked loop

1989-05-16

1990-03-27

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 27, 331 34, 331 57, 3581911, 3581941, 3581951, 455260, H03L 708, H03L 716

Patent

active

049124331

ABSTRACT:
A voltage controlled oscillator (VCO) is controlled by a separate phase locked loop (PLL). The PLL includes a first variable delay circuit of m stages which receives a reference frequency signal and produces a delayed signal which is compared in a phase comparator with the reference frequency signal. A first control signal generating circuit in the PLL receives the output of the phase comparator and a reference voltage to produce a first control signal for controlling the delay of the first variable delay circuit. The VCO contains a ring oscillator formed of a second variable delay circuit of n stages similar to those of the first variable delay circuit. A second control signal generating circuit in the VCO receives the output of the phase comparator and a control voltage to produce a second control signal for controlling the delay of the second variable delay circuit to thereby control the output frequency of the VCO.

REFERENCES:
patent: 3614649 (1971-10-01), Gerig
patent: 4091335 (1978-05-01), Giolma et al.
patent: 4131861 (1978-12-01), Malaviya
patent: 4336505 (1982-06-01), Meyer
patent: 4623851 (1986-11-01), Abou
patent: 4623852 (1986-11-01), Abou et al.
patent: 4829545 (1989-05-01), Guzik et al.
patent: 4859970 (1989-08-01), Matsuo et al.
IEEE Journal of Solid-State Circuits, vol. SC-22, No. 2, Apr. 1987, pp. 255-261, entitled: Design of PLL-Based Clock Generation Circuits.

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