Very low-gain voltage controlled oscillator

Details Very low-gain voltage controlled oscillator Very low-gain voltage controlled oscillator

1997-08-11

1999-05-04

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 16, 331185, 331 1A, 327156, 327159, H03L 7099

Patent

active

059007842

ABSTRACT:
The use of a control circuit (160) with either a programmable divider or divider(s) (190) and multiplexer (200) guarantees that, irrespective of the process variations, a voltage controlled oscillator has a low gain Vin-Fout characteristic in the desired frequency range. Low-gain voltage controlled oscillators are fundamental building blocks of low-jitter phase-locked loop (PLL) systems. The programmable divider/divider(s) (190) and multiplexer (200) are placed at an output of a current controlled oscillator(s) (180). A control circuit (160) defines the optimum current range(s) in the current controlled oscillator(s) (180). In the case of when a programmable divider is used, the control circuit (160) keeps changing the division ratio of the programmable divider until the PLL eventually achieves the "locked" state. When divider(s) and a multiplexer (200) are used, the control circuit (160) keeps changing the selected multiplexer input until the "locked" state has been achieved. Only one current controlled oscillator is achieve at any one time. This control circuit could be for example an auto-lock circuit.

REFERENCES:
patent: 4876519 (1989-10-01), Davis et al.
patent: 5298870 (1994-03-01), Cytera et al.
patent: 5300898 (1994-04-01), Chen et al.
patent: 5331295 (1994-07-01), Jelinek et al.
patent: 5359301 (1994-10-01), Candage

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