Dynamically matched mixer system with improved in-phase and quadrature (I/Q) balance and second order intercept point (IP2) performance

摘要

A dynamically matched mixer system ( 200 ) for use in a direct conversion radio frequency (RF) receiver includes a frequency generator ( 201, 203, 205 ) that includes plurality of dividers ( 407 ) for providing differential local oscillator reference sources (F_LO+ and F_LO-) and mitigation frequency reference sources (F 1 and F 2 ) from reference oscillator ( 205 ). A mixer ( 209 ) mixes the differential local oscillator reference sources (F_LO+ and F_LO-) and the mitigation frequency reference sources (F 1 and F 2 ) while dynamic matching units ( 211, 213 ) are used for receiving the mitigation frequency reference sources and matching switching parameters of differential input signals (I_RF+ and I_RF-) and differential baseband output signals (I_BB+ and I_BB-). The frequencies of the mitigation frequency reference sources (F 1 and F 2 ) are selected so as to establish a non-integer relationship to the reference oscillator ( 201 ) for mitigating the occurrence of interference with F_LO+ and F_LO-.