Patent ID: 8599938
Filing Date: 2013-12-03
Classification: H03C,H03D,H03G,H04L

Abstract:
1. A method for upconverting a baseband signal comprising: in a linear mode, mixing a baseband in-phase (BB I) signal with a local oscillator in-phase (LO I) signal using a primary mixer; in the linear mode, mixing a baseband quadrature (BB Q) signal with a local oscillator quadrature (LO Q) signal using a secondary mixer; in the linear mode, combining the outputs of the primary and secondary mixers to generate an upconverted signal; in a polar mode, mixing a baseband amplitude (BB) signal with a phase-modulated local oscillator (LO) signal using the primary mixer; and in the polar mode, mixing the BB signal with the phase-modulated LO signal using the secondary mixer; in the polar mode, combining the outputs of the primary and secondary mixers to generate the upconverted signal; the primary mixer and the secondary mixer each comprising a plurality of sub-mixers, the method further comprising selectively enabling at least one of the sub-mixers of the primary and secondary mixers to adjust gains of the primary and second mixers, respectively, in response to a required transmitter gain.