A CALIBRATED DC COMPENSATION SYSTEM FOR A WIRELESS COMMUNICATION DEVICE CONFIGURED IN A ZERO INTERMEDIATE FREQUENCY ARCHITECTURE

摘要

A calibrated DC compensation system for a wireless communication device (400, 500, 600, 700) configured in a zero intermediate frequency (ZIF) architecture. The device includes ZIF transceiver (201) and a baseband processor (203), which further includes a calibrator (401) that periodically performs a calibration procedure. The baseband processor includes gain control logic (345), DC control logic (347), a gain converter (331) and the calibrator (401). The gain converter converts gain between the gain control logic and the DC control logic. The calibrator programs the gain converter (331) with values determined during the calibration procedure. The calibration procedure includes sampling an output signal for each gain step of the baseband amplifier (307) at two predetermined range values and corresponding DC offsets using successive approximation. The data is used to calculate gain, DC offset and DC differential values, which are used to determine the conversion values.