Patent ID: 7675378
Filing Date: 2010-03-09
Classification: H03B

Abstract:
1. A voltage controlled oscillator comprising: an inductor-capacitor (LC) tank adapted to receive a first voltage; at least one varactor connected in parallel with said LC tank and adapted to receive a second voltage; an output node connected to said LC tank and said at least one varactor for outputting a periodic signal having a frequency that is a function of said first voltage and said second voltage; a variable resistance e-fuse adapted to apply said second voltage to said at least one varactor; and a controller adapted to program resistance in said variable resistance e-fuse, when said frequency is outside a predetermined frequency range, so as to selectively adjust said second voltage, so as to adjust capacitance of said at least one varactor, and further so as to bring said frequency of said periodic signal to within said predetermined frequency range.