Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2006-02-21
2006-02-21
Nguyen, Minh (Department: 2816)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S025000
Reexamination Certificate
active
07002414
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.
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Chang Chia-Yang
Chen Po-Chang
Lee Yang-Han
Yang Ching-Yuan
Nguyen Minh
Princeton Technology Corp.
Thomas Kayden Horstemeyer & Risley
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