A continuously and widely tunable analog baseband chain with digital-assisted calibration for multi-standard DBS applications

Abstract

This paper presents a continuously and widely tunable analog baseband chain with a digital-assisted calibration scheme implemented on a 0.13 m CMOS technology. The analog baseband is compliant with several digital broadcasting system (DBS) standards, including DVB-S, DVB-S2, and ABS-S. The cut-off frequency of the baseband circuit can be changed continuously from 4.5 to 32 MHz. The gain adjustment range is from 6 to 55.5 dB with 0.5 dB step. The calibration includes automatic frequency tuning (AFT) and automatic DC offset calibration (DCOC) to achieve less than 6% cut-off frequency deviation and 3 mV residual output offset. The out-of-band IIP2 and IIP3 of the overall chain are 45 dBm and 18 dBm respectively, while the input referred noise (IRN) is 17.4 nV/ p Hz. All circuit blocks are operated at 2.8 V from LDO and consume current of 20.4 mA in the receiving mode.