Oscillators – With frequency adjusting means – With voltage sensitive capacitor
Reexamination Certificate
2008-03-28
2009-10-27
Mis, David (Department: 2817)
Oscillators
With frequency adjusting means
With voltage sensitive capacitor
C331S03600C
Reexamination Certificate
active
07609121
ABSTRACT:
Disclosed are embodiments of a voltage controlled oscillator (VCO) capable of non-volatile self-correction to compensate for process variations and to ensure that the center frequency of the oscillator is maintained within a predetermined frequency range. This VCO incorporates a pair of varactors connected in parallel to an inductor-capacitor (LC) tank circuit for outputting a periodic signal having a frequency that is proportional to an input voltage. A control loop uses a programmable variable resistance e-fuse to set a compensation voltage to be applied to the pair of varactors. By adjusting the compensation voltage, the capacitance of the pair of varactors can be adjusted in order to selectively increase or decrease the frequency of the periodic signal in response to a set input voltage and, thereby to bring the frequency of that periodic signal into the predetermined frequency range. Also disclosed are embodiments of an associated design structure for such a VCO and an associated method for operating such a VCO.
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Feng Kai D.
Lai Kafai
Wang Ping-Chuan
Yang Zhijian J.
Gibb I.P. Law Firm LLC
Harding, Esq. W. Riyon
International Business Machines - Corporation
Mis David
LandOfFree
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