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US 11,437,957 B2Granted
Accelerated channel scanning with a two-point-modulated phase-locked loop
AssigneeQUALCOMM Incorporated
InventorsZafer Boz, Dhammika Bokolamulla, Philip Jones
Life of this patent
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Abstract
A receiver is provided having a two-point-modulated phase-locked loop for the rapid scanning of the signal strength of a plurality of frequency channels. The two-point modulation includes a modulation of a frequency gain by an oscillator in the phase-locked loop and a modulation of a frequency division by a divider in the phase-locked loop.
Claims20
A receiver, comprising:
- a phase-locked loop including an oscillator configured to generate a local oscillator signal, wherein the oscillator is further configured to respond to a control signal according to a frequency gain that is responsive to a frequency deviation command to control a frequency of the local oscillator signal, the phase-locked loop also including a divider configured to divide the local oscillator signal responsive to the frequency deviation command;
- a mixer configured to mix a radio frequency signal with the local oscillator signal to produce a down-converted signal;
- a signal strength measurement circuit configured to measure a signal strength of the down-converted signal;
- and
- a baseband controller configured to adjust the frequency deviation command to perform a signal strength scan over a plurality of channels for the radio frequency signal.
2 more elements
A method of scanning Bluetooth channels, comprising:
- adjusting a frequency gain of an oscillator to produce a first local oscillator signal in a phase-locked loop based upon a first value of a frequency deviation command while adjusting a division of the first local oscillator signal in a divider in the phase-locked loop based upon the first value of the frequency deviation command;
- mixing a radio frequency signal with the first local oscillator signal to produce a first down-converted signal;
- and
- measuring a signal strength of the first down-converted signal to determine a signal strength of the first Bluetooth channel.
1 more element
A method, comprising:
- modulating a frequency gain of an oscillator in a phase-locked loop to equal a first frequency gain responsive to a first value of a frequency deviation command to produce a first local oscillator signal having a frequency of a first Bluetooth channel;
- modulating a frequency division by a divider in the phase-locked loop responsive to the first value of the frequency deviation command to keep the phase-locked loop in lock during the modulating of the frequency gain to equal the first frequency gain;
- mixing a radio frequency signal with the first local oscillator signal during a first measurement period to produce a first down-converted signal;
- and
- measuring a signal strength of the first down-converted signal to measure a signal strength of the first Bluetooth channel.
2 more elements
A Bluetooth receiver, comprising:
- an oscillator configured to produce a local oscillator signal at a frequency that is a function of a frequency gain that is responsive to a frequency gain command;
- and
- a divider configured to divide the local oscillator signal in frequency according to a divisor that is responsive to a frequency deviation command to produce a divided signal;
- a multiplier configured to multiply the frequency deviation command with a gain adjustment to produce a product;
- a lookup table configured to map the product into the frequency gain command;
- a mixer for mixing the local oscillator signal with a radio frequency signal to produce a down-converted signal;
- and
- a signal strength measurement circuit configured to measure a signal strength of the down-converted signal to determine a signal strength of a Bluetooth channel including the frequency.
5 more elements
Dependencies are inferred from the claim text.