Patent ID: 8976897
Filing Date: 2015-03-10
Classification: H03D,H03F,H04B

Abstract:
1. A communication device having a transmission path comprising: N upconverters each receiving M phases of a baseband signal to be transmitted, each upconverter further receiving a different one of N sets of phases of a local oscillator (LO) signal, each of the N sets comprising M different phases of the LO signal; N amplifiers each responsive to a different one of the N upconverters to generate N amplified signals; and at least one combiner adapted to combine the N amplified signals to generate an output signal, wherein a frequency component falling at a multiple of a sum of a LO signal frequency and a baseband signal frequency, or a multiple of a difference between the LO signal frequency and the baseband signal frequency is substantially suppressed from the output signal by selecting a gain of at least a first one of the N amplifiers to be different from a gain of a remaining one of the N amplifiers, wherein N and M are integers greater than 1.