Method for agile region and band conscious frequency planning for wireless transceivers
AssigneeBroadcom Corporation
InventorsNikolaos C. Haralabidis, Theodoros Georgantas
Life of this patent
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Abstract
A technique for agile region and band conscious frequency planning for wireless transceivers in which a comparison frequency is selected for generating a local oscillator signal. The comparison frequency (Fcomp) is selected for a frequency band of a particular communication standard or protocol, in order not to introduce harmonic components of the selected comparison frequency in a transmitted signal from the wireless device that generates spurious emissions restricted by the particular communication protocol or another protocol. The Fcomp selection may also take into consideration restrictive region-specific criteria for out-of band spurious emissions.
Claims19
A method comprising:
- receiving a first clock signal;
- selecting a comparison frequency from a plurality of stored comparison frequency values, in which the selected comparison frequency is based on a particular communication protocol and transmission frequency of operation for a wireless device, wherein the selected comparison frequency is selected in order not to introduce harmonic components of the selected comparison frequency in a transmitted signal from the wireless device that generates spurious emissions restricted by the particular communication protocol or another protocol;
- generating a second clock signal from the first clock signal, in which the second clock signal is approximately at the selected comparison frequency;
- and
- generating a local oscillator signal from the second clock signal instead of the first clock signal.
A method comprising:
- determining an available frequency band of operation for a wireless device based on a particular communication protocol;
- generating a first clock signal based on a fixed reference clock frequency;
- selecting a comparison frequency from a plurality of stored comparison frequency values, in which the selected comparison frequency is based on the particular communication protocol and the available frequency band of operation for the wireless device, wherein the selected comparison frequency is selected in order not to introduce harmonic components of the selected comparison frequency in a transmitted signal from the wireless device that generates spurious emissions restricted by the particular communication protocol or another protocol;
- generating a second clock signal from the first clock signal, in which the second clock signal is approximately at the selected comparison frequency;
- and
- generating a local oscillator signal from the second clock signal instead of the first clock signal.
An apparatus comprising:
- a first phase-locked loop (PLL) to generate a first clock signal based on a reference clock frequency;
- a frequency selection module to select a comparison frequency from a plurality of stored comparison frequency values, in which the selected comparison frequency is based on a particular communication protocol and transmission frequency of operation for a wireless device, wherein the selected comparison frequency is selected in order not to introduce harmonic components of the selected comparison frequency in a transmitted signal from the wireless device that generates spurious emissions restricted by the particular communication protocol or another protocol;
- a frequency divider, coupled to receive the first clock signal and a signal indicative of the selected comparison frequency, to divide the first clock signal by a predetermined dividing factor to generate a second clock signal approximately at the selected comparison frequency;
- and
- a second PLL to receive the second clock signal as a reference signal input and to generate a local oscillator signal based on the second clock signal.
Dependencies are inferred from the claim text.