Digital adjustable chip oscillator

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

Reexamination Certificate

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Details

Other Related Categories

C331S025000

Type

Reexamination Certificate

Status

active

Patent number

07002414

Description

ABSTRACT:
A digital adjustable chip oscillator comprises a voltage control oscillator, a reference voltage circuit, a voltage regulation circuit, a digital tuning circuit, a frequency detector and a programmable controller. The oscillator generates an oscillation signal and receives a control voltage and an operating voltage from the voltage regulation circuit and the reference voltage circuit to stabilize and adjust the frequency of oscillation signal. The digital tuning circuit receives a digital code stored in a programmable memory to adjust the control voltage. The frequency detector detects and compares the frequency of oscillation signal with a first and second frequency, wherein when the frequency of the oscillation signal lies between the first and second frequency, the frequency detector outputs a high voltage signal and otherwise the frequency detector outputs a low voltage signal. The programmable controller receives the high voltage signal to stop a programmable counter to acquire the digital code.

REFERENCES:
patent: 5552748 (1996-09-01), O'Shaughnessy
patent: 5912595 (1999-06-01), Ma et al.
patent: 6198353 (2001-03-01), Janesch et al.
patent: 6225856 (2001-05-01), Toth
patent: 6747497 (2004-06-01), Ingino, Jr.
patent: 6753739 (2004-06-01), Mar et al.
patent: 6778033 (2004-08-01), Wong et al.

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