Patent ID: 8009786
Filing Date: 2011-08-30
Classification: H04B

Abstract:
1. A method comprising: receiving a first clock signal; selecting a comparison frequency from a plurality of comparison frequency values stored in a look-up table based on a particular communication protocol and transmission frequency band selected for operation of 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 control signal corresponding to the selected comparison frequency; generating a second clock signal from the first clock signal by dividing the first clock signal by a dividing factor determined by the control signal to produce the second clock signal approximately at the selected comparison frequency; generating a transmit local oscillator signal from the second clock signal instead of the first clock signal, in which the transmit local oscillator signal is generated separately from a receive local oscillator signal; and coupling the transmit local oscillator signal to a first power amplifier of a transmitter when operating using a first communication protocol or coupling the transmit local oscillator signal to a second power amplifier of the transmitter when operating using a second communication protocol.