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 (F1 and F2) 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 (F1 and F2) 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 (F1 and F2) 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−