In a complex radio communication system most of the radio’s impairments are digitally corrected, assisted by the digital baseband processor/controller. There are applications where the radio is placed on a separate die from the digital baseband processor for performance or business related reasons. These stand alone radios are analog in nature with digital content only in the ADC, baseband filtering and PLL.
This talk will focus on the techniques used for correction of the quadrature mixer impairments in the analog domain. Several options are presented to correct for phase and amplitude imbalance, second and third order nonlinearity and the local oscillator leakage.