Back to results
US 2011/0299644 A1Published application
Emission Suppression for Wireless Communication Devices
OwnerBing Xu, Chunming Zhaoinventors
Life of this patent
Estimating the term…
Abstract
A method may include synchronizing an output of a phase-locked loop to a signal received at its input. The method may further include suppressing emission at a potentially problematic channel by applying at least one of a first gain and a first resistance of the phase-locked loop for a communication at the potentially problematic channel, wherein at least one of the first gain and the first resistance are different from a second gain and a second resistance applied for communications at channels other than potentially problematic channels.
Claims23
A transmitting source, comprising:
- an upconverter configured to frequency upconvert an analog signal to a wireless communication signal at a radio frequency based on an oscillator signal;
- and
- an oscillator coupled to the upconverter and configured to output the oscillator signal to the upconverter, the oscillator comprising a phase-locked loop, the phase-locked loop configured to:
- synchronize its output to a signal received at its input;
- and
- suppress emission at a potentially problematic channel by applying at least one of a first gain and a first resistance of the phase-locked loop for a transmission at the potentially problematic channel, wherein at least one of the first gain and the first resistance are different from a second gain and a second resistance applied for transmissions at channels other than potentially problematic channels.
3 more elements
A method, comprising:
- synchronizing an output of a phase-locked loop to a signal received at its input;
- and
- suppressing emission at a potentially problematic channel by applying at least one of a first gain and a first resistance of the phase-locked loop for a communication at the potentially problematic channel, wherein at least one of the first gain and the first resistance are different from a second gain and a second resistance applied for communications at channels other than potentially problematic channels.
A phase-locked loop comprising:
- a phase detector configured to compare a first phase of an input signal to a second phase of an output signal and produce a first signal proportional to the difference between the second phase and the first phase;
- a loop filter coupled to the phase detector and configured to filter the first signal to produce an error signal;
- a voltage controlled oscillator configured to produce the output signal based on the error signal;
- and
- a variable control module configured to control at least one of a gain and a resistance of the phase-locked loop.
2 more elements
Dependencies are inferred from the claim text.