Patent ID: 7777578

Claim:
An oscillator circuit having closed-loop control for a frequency change, comprising: an oscillator tunable to discrete output frequency values, comprising an output for outputting an oscillator signal thereat; at least one tuning element selectively coupled to the oscillator via a switching device, and configured to selectively influence a tuning of a frequency of the oscillator signal; a threshold value circuit coupled to the oscillator and configured to produce a clock signal based on the oscillator signal, the clock signal comprising a phase; and a phase delay circuit comprising a first switching input, and a signal input configured to receive the clock signal of the threshold value circuit, and further comprising a switching output coupled to the switching device, and comprising a comparison circuit configured to compare the phase of the clock signal with a fixed reference phase value selected from a memory storing a plurality of predetermined fixed reference phase values, and further configured to emit a switching signal at the switching output in response to application of an activation signal to the first switching input and upon detecting a predetermined phase relationship between the clock signal and the fixed reference phase value.