Patent ID: 7724837
Filing Date: 2010-05-25
Classification: H03C,H03F,H03G,H04L

Abstract:
1. A method for I/Q modulation, the method comprising: converting an in-phase (I) and a quadrature (Q) component of a complex-valued analog baseband input signal into signals representing a magnitude and a phase of I/Q modulation states of the complex-valued analog baseband input signal, respectively; and combining the signals representing the magnitude and phase to generate a modulated RF output transmission signal, wherein slow high-level components and fast low-level components of the signal representing the magnitude are amplified in separate amplifier stages, and wherein the slow high-level components and the fast low-level components of the signal representing the magnitude are combined to provide a combined envelope representing signal by supplying the low-level components to a power amplifier whose gain is controlled based on the amplified high-level components.