Back to results
US 8,045,937 B2Granted
Digital phase feedback for determining phase distortion
AssigneeInfineon Technologies AG
InventorsThomas Mayer, Nick Shute
Life of this patent
Estimating the term…
Abstract
A feedback loop is used to determine phase distortion created in a signal by directly extracting the phase distortion information from a feedback signal using original frequency modulation information.
Claims14
A circuit for determining a phase distortion comprising:
- a phase modulator that receives a reference signal and a frequency modulation signal for generating a first signal;
- a delay block that receives and delays the frequency modulation signal;
- a Sigma-Delta modulator that receives the delayed frequency modulation signal for determining a corresponding divider ratio;
- a multi-modulus divider that receives a feedback signal derived from the first signal and divides the feedback signal according to the divider ratio received from the Sigma-Delta modulator for removing phase modulation applied by the phase modulator;
- and
- a time-to-digital converter for receiving the feedback signal output from the multi-modulus divider and the reference signal as inputs, and for outputting a derived signal representing phase distortion of the first signal.
3 more elements
A circuit for determining a phase distortion in a transmit path of a polar transmitter, comprising:
- a reference clock for outputting a reference signal;
- a phase modulator that receives the reference signal and a frequency modulation signal for generating a modulated first signal;
- a multiplier that multiplies the modulated first signal with an amplitude modulation signal for producing a transmit signal, wherein the transmit path includes the phase modulator and the multiplier;
- a coupler for deriving a feedback signal from the transmit signal;
- a phase restoration block that receives the feedback signal and removes amplitude information therefrom;
- a delay block that receives and delays the frequency modulation signal to match a delay in the feedback signal;
- a Sigma-Delta modulator for receiving the delayed frequency modulation signal for determining a corresponding divider ratio;
- a multi-modulus divider for receiving the feedback signal derived from the phase restoration block and dividing the feedback signal according to the divider ratio received from the Sigma-Delta modulator for removing phase modulation applied by the phase modulator;
- and
- a time-to-digital converter for receiving the feedback signal from the multi-modulus divider and the reference signal as inputs and for outputting a derived representation of the phase distortion in form of a time delta.
7 more elements
Dependencies are inferred from the claim text.