An Analog Wide-Bandwidth Baseband Chain for 12Gbps 256QAM Direct-Conversion Receiver

This paper presents a broadband low-power baseband designed for a zero-IF phased-array receiver. It can support up to 12 Gbps 256QAM and 17Gbps 32QAM signalling. Baseband circuit provides filtering for RF channel bandwidths between 1.4 GHz to 6 GHz in 16 different steps. It incorporates variable-gain-amplifiers with total tuning range of 40 dB. DC offset up to +/-2.3mA at mixer output is cancelled. Baseband consumes 100mW per I and Q channel using double supplies of 1.5 V and 2.5 V. Design is fabricated in 0.18,..., m SiGe BiCMOS process with f
_T
/ f
_MAX
of 240/270GHz.