Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Reexamination Certificate
2005-05-17
2005-05-17
Mis, David (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
C331S008000, C331S010000, C331S016000, C331S025000, C327S157000
Reexamination Certificate
active
06894570
ABSTRACT:
The present invention is related to a fast frequency locking method and architecture realized by employing adaptive asymmetric charge-pump current mechanism, whose circuit is composed of elements such as: a pair of frequency-dependent main current sources, a pair of (rising, descending) frequency-dependent assistant current sources, a digital control circuit, a voltage controlled oscillator, an impedance, a sampling frequency sampled from output frequency of the voltage controlled oscillator, a fixed reference frequency and a phase detector, etc. The difference between the present invention and traditional charge-pump circuit is that the present invention had added at least one pair of frequency-dependent assistant current sources. The frequency-dependent assistant current sources are used to enlarge current source so that frequencies predefined by user can be achieved promptly by employing the voltage controlled oscillator to control the rising or descending of voltage under different power voltages, and then a digital control circuit of the present invention can be utilized to achieve the objective of fast frequency locking.
REFERENCES:
patent: 5220294 (1993-06-01), Ichikawa
Holtek Semiconductor Inc.
Mis David
Troxell Law Office PLLC
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