Patent ID: 7764127
Filing Date: 2010-07-27
Classification: H03B,H03L

Abstract:
1. A digitally controlled oscillator (DCO) comprising an inductor-capacitor circuit that generates an oscillating output, wherein the inductor-capacitor circuit includes: a coarse digital tuning unit that coarsely tunes the oscillating output, wherein each coarse digital tuning unit includes a resistor between an inverter and a capacitor; and a fine digital tuning unit that finely tunes the oscillating output, wherein the fine digital tuning unit includes fine tuning elements and wherein each of the fine tuning elements comprises plate capacitors and at least three transistors between the plate capacitors; wherein the coarse digital tuning unit includes a plurality of coarse tuning elements, and wherein the coarse tuning elements include capacitors positioned between an inner coil element and an outer coil element of an inductor of the inductor-capacitor circuit.