Voltage-controlled crystal oscillator with extended range

Details Voltage-controlled crystal oscillator with extended range Voltage-controlled crystal oscillator with extended range

1996-08-27

1997-12-30

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 18, 331 25, 327156, 327106, 455260, 455264, H03L 706, H03L 718

Patent

active

057035407

ABSTRACT:
A voltage-controlled crystal oscillator circuit with an extended range is presented. The circuit has a crystal oscillator circuit, a phase-locked loop (PLL), and a look-up table. The crystal oscillator circuit generates a signal having a frequency f.sub.ref at its output node responsive to a voltage at its input terminal. The PLL has its input node connected to the crystal oscillator output node and generates a signal at the PLL output node having a frequency f.sub.o. A first divider circuit of the PLL divides the f.sub.ref frequency by a first variable integer M and a second PLL divider circuit divides the f.sub.o frequency by a second variable integer N. The look-up table, which has comparators connected to the input terminal, a counter connected to the comparators and a memory responsive to the counter and storing M and N values, varies M and N responsive to the input terminal voltage so that the voltage-controlled crystal oscillator circuit has an increased frequency range.

REFERENCES:
patent: 5382922 (1995-01-01), Gersbach et al.

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