Patent ID: 8331485

Claim:
A method for reducing spurs within a transmit signal comprising: determining a cancelling tone; adding the cancelling tone to a baseband transmit signal in the digital domain to obtain a baseband transmit signal with cancelling tone; reducing a spur in the transmit signal using the cancelling tone by: modulating the baseband transmit signal with canceling tone to form a modulated baseband transmit signal with canceling tone; converting the modulated baseband transmit signal with cancelling tone from a digital signal to an analog transmit signal using a digital to analog converter (DAC); and mixing the analog transmit signal with a local oscillator signal generated by a voltage controlled oscillator (VCO) and a phase locked loop (PLL) to form a mixed transmit signal, the local oscillator signal comprising a local oscillator frequency and at least one spur at multiples of the local oscillator frequency; amplifying the mixed transmit signal to form the transmit signal with the reduced spur; and transmitting the transmit signal with the reduced spur using an antenna.