Patent ID: 9008252
Filing Date: 2015-04-14
Classification: H03C,H03L,H04L

Abstract:
1. A circuit, comprising: an oscillator configured to provide a radio frequency (RF) signal as an output signal of the oscillator, wherein the oscillator is configured to operate in a free-running mode of operation; a variable phase adjuster configured to provide a phase adjusted signal derived from the output signal and having a phase that is shifted with respect to a phase of the output signal; a feedback loop configured to provide a control value for controlling the variable phase adjuster based on the phase adjusted signal and a reference oscillator signal to counteract a phase error of the phase adjusted signal; wherein the feedback loop comprises a divider and a phase error determiner; wherein the divider is configured to provide a frequency-divided signal using the phase adjusted signal; wherein the phase error determiner is configured to determine a phase error signal based on the reference oscillator signal and the frequency-divided signal; and wherein the feedback loop is configured to provide the control value for controlling the variable phase adjuster using the determined phase error signal.