Method for adjusting the output frequency of a frequency synthesizer

Claim 2

In a frequency synthesizer that includes a reference oscillator, a reference divider, a phase detector, an output frequency divider, a voltage control oscillator, and a multi-bandwidth filter, a method for adjusting output frequency of the frequency synthesizer, the method comprises the steps of: a) detecting a frequency adjustment request, wherein the frequency adjustment request indicates a selected frequency; b) calculating a difference between the selected frequency and a present frequency to produce a frequency difference; c) determining a frequency scaling factor; d) calculating a frequency adjustment time based on a proportional relationship between the frequency difference and the frequency scaling factor, wherein the proportional relationship is based on time required to charge or discharge a capacitor of the multi-bandwidth filter to produce an optimum pull-back for the frequency difference; e) adjusting bandwidth of the multi-bandwidth filter from a first bandwidth to at least a second bandwidth for a duration of the frequency adjustment time; f) adjusting the output frequency of the frequency synthesizer from the present frequency to the selected frequency prior to expiration of the frequency adjustment time; and g) upon expiration of the frequency adjustment time, adjusting the bandwidth of the multi-bandwidth filter from the second bandwidth to the first bandwidth.

Claim 3

The method of claim 1, wherein step (c) further comprises determining the frequency scaling factor based on an average of the selected frequency and the present frequency.

Claim 4

The method of claim 1, wherein step (c) further comprises determining the frequency scaling factor based on frequency operating limits of the frequency synthesizer.

Claim 5

The method of claim 1, wherein step (e) further comprises determining the second bandwidth based on the selected frequency.

Claim 6

In a communication device that includes a radio frequency (RF) receiver and a frequency synthesizer that provides a local oscillator frequency, wherein the frequency synthesizer includes a reference oscillator, a reference divider, a phase detector, an output frequency divider, a voltage control oscillator, and a multi-bandwidth filter, a method for adjusting the local oscillator frequency, the method comprising the steps of: a) detecting a channel adjustment request, wherein the channel adjustment request indicates a selected frequency; b) calculating a difference between the selected frequency and a present frequency to produce a frequency difference; c) determining a frequency scaling factor; d) calculating a frequency adjustment time based on a proportional relationship between the frequency difference and the frequency scaling factor, wherein the proportional relationship is based on time required to charge or discharge a capacitor of the multi-bandwidth filter to produce an optimum pull-back for the frequency difference; e) adjusting bandwidth of the multi-bandwidth filter from a first bandwidth to at least a second bandwidth for a duration of the frequency adjustment time; f) adjusting the local oscillator frequency from the present frequency to the selected frequency prior to expiration of the frequency adjustment time; and g) upon expiration of the frequency adjustment time, adjusting the bandwidth of the multi-bandwidth filter from the second bandwidth to the first bandwidth.

Claim 7

In a communication device that includes a radio frequency (RF) receiver and a frequency synthesizer that provides a local oscillator frequency, wherein the frequency synthesizer includes a reference oscillator, a reference divider, a phase detector, an output frequency divider, a voltage control oscillator, and a multi-bandwidth filter, a method for adjusting the local oscillator frequency, the method comprising the steps of: a) detecting a channel adjustment request, wherein the channel adjustment request indicates a selected frequency; b) calculating a difference between the selected frequency and a present frequency to produce a frequency difference; c) determining a frequency scaling factor; d) calculating a frequency adjustment time based on a proportional relationship between the frequency difference and the frequency scaling factor, wherein the proportional relationship is based on time required to charge or discharge a capacitor of the multi-bandwidth filter to produce an optimum pull-back for the frequency difference; e) adjusting bandwidth of the multi-bandwidth filter from a first bandwidth to at least a second bandwidth for a duration of the frequency adjustment time; f) adjusting the local oscillator frequency from the present frequency to the selected frequency prior to expiration of the frequency adjustment time; and g) upon expiration of the frequency adjustment time, adjusting the bandwidth of the multi-bandwidth filter from the second bandwidth to the first bandwidth.

Claim 8

In a communication device that includes a radio frequency (RF) transmitter and a frequency synthesizer that provides a frequency reference, wherein the frequency synthesizer includes a reference oscillator, a reference divider, a phase detector, an output frequency divider, a voltage control oscillator, and a multi-bandwidth filter, a method for adjusting the frequency reference, the method comprising the steps of: a) detecting a channel adjustment request, wherein the channel adjustment request indicates a selected frequency; b) calculating a difference between the selected frequency and a present frequency to produce a frequency difference; c) determining a frequency scaling factor; d) calculating a frequency adjustment time based on a proportional relationship between the frequency difference and the frequency scaling factor, wherein the proportional relationship is based on time required to charge or discharge a capacitor of the multi-bandwidth filter to produce an optimum pull-back for the frequency difference; e) adjusting bandwidth of the multi-bandwidth filter from a first bandwidth to at least a second bandwidth for a duration of the frequency adjustment time; f) adjusting the frequency reference from the present frequency to the selected frequency prior to expiration of the frequency adjustment time; and g) upon expiration of the frequency adjustment time, adjusting the bandwidth of the multi-bandwidth filter from the second bandwidth to the first bandwidth.

Claim 9

In a communication device that includes a radio frequency (RF) transmitter and a frequency synthesizer that provides a frequency reference, wherein the frequency synthesizer includes a reference oscillator, a reference divider, a phase detector, an output frequency divider, a voltage control oscillator, and a multi-bandwidth filter, a method for adjusting the frequency reference, the method comprising the steps of: a) detecting a channel adjustment request, wherein the channel adjustment request indicates a selected frequency; b) calculating a difference between the selected frequency and a present frequency to produce a frequency difference; c) determining a frequency scaling factor; d) calculating a frequency adjustment time based on a proportional relationship between the frequency difference and the frequency scaling factor, wherein the proportional relationship is based on time required to charge or discharge a capacitor of the multi-bandwidth filter to produce an optimum pull-back for the frequency difference; e) adjusting bandwidth of the multi-bandwidth filter from a first bandwidth to at least a second bandwidth for a duration of the frequency adjustment time; f) adjusting the frequency reference from the present frequency to the selected frequency prior to expiration of the frequency adjustment time; and g) upon expiration of the frequency adjustment time, adjusting the bandwidth of the multi-bandwidth filter from the second bandwidth to the first bandwidth.

Claim 10

In a frequency synthesizer that includes a reference oscillator, a reference divider, a phase detector, an output frequency divider, a voltage control oscillator, and a multi-bandwidth filter, a method for adjusting output frequency of the frequency synthesizer, the method comprising the steps of: a) detecting a frequency adjustment request, wherein the frequency adjustment request indicates a selected frequency; b) calculating a difference between the selected frequency and a present frequency to produce a frequency difference; c) determining a frequency scaling factor; d) calculating a frequency adjustment time based on the frequency difference and the frequency scaling factor, wherein the proportional relationship is based on time required to charge or discharge a capacitor of the multi-bandwidth filter to produce an optimum pull-back for the frequency difference; e) adjusting bandwidth of the multi-bandwidth filter from a first bandwidth to at least a second bandwidth for a duration of the frequency adjustment time; f) adjusting the output frequency of the frequency synthesizer from the present frequency to the selected frequency prior to expiration of the frequency adjustment time; and g) upon expiration of the frequency adjustment time, adjusting the bandwidth of the multi-bandwidth filter from the second bandwidth to the first bandwidth.

Claim 11

In a frequency synthesizer that includes a reference oscillator, a reference divider, a phase detector, an output frequency divider, a voltage control oscillator, and a multi-bandwidth filter, a method for adjusting output frequency of the frequency synthesizer, the method comprising the steps of: a) detecting a frequency adjustment request, wherein the frequency adjustment request indicates a selected frequency; b) calculating a difference between the selected frequency and a present frequency to produce a frequency difference; c) determining a frequency scaling factor; d) calculating a frequency adjustment time based on the frequency difference and the frequency scaling factor, wherein the proportional relationship is based on time required to charge or discharge a capacitor of the multi-bandwidth filter to produce an optimum pull-back for the frequency difference; e) adjusting bandwidth of the multi-bandwidth filter from a first bandwidth to at least a second bandwidth for a duration of the frequency adjustment time; f) adjusting the output frequency of the frequency synthesizer from the present frequency to the selected frequency prior to expiration of the frequency adjustment time; and g) upon expiration of the frequency adjustment time, adjusting the bandwidth of the multi-bandwidth filter from the second bandwidth to the first bandwidth.