Integrated oscillator circuit and associated methods

摘要

An integrated circuit includes an oscillator circuit (12) for generating an output signal having a desired frequency. The oscillator circuit includes a capacitive device (14) having a controllable capacitance value responsive to a control signal. A control circuit (16) is connected to the oscillator circuit for controlling the capacitance value so that the oscillator circuit generates the output signal at the desired frequency. The control circuit includes a memory (18) for storing a digital control word and a control signal generating circuit (20) for converting the digital control word into the control signal for the capacitive device. Setting the desired frequency of the output signal is performed internal to the integrated circuit without requiring complex control circuitry for switching among various capacitors.