(A) 250 GHz wideband direct-conversion receiver for 100 Gbps data rate

Abstract

This paper proposes a 250 GHz band 108 Gbps wireless mixer-first and direct-conversion Receiver (RX) based on 65nm CMOS Technology. The RX is composed of the radio frequency (RF) to baseband (BB) I/Q mixers, the BB variable gain amplifier (VGA), and the quadrature local oscillation (LO) signal generation path. The I/Q mixer is designed as a single-balanced passive mixer and uses the lambda/4 line stub to prevent the LO to BB feedthrough, resulting in improved conversion gain (CG). BB VGA utilizes an inductive peaking technology to compensate for the narrow bandwidth of the mixer, allowing the RX to have a wide and uniform bandwidth of 27 GHz. The RX has 4.14 dB CG, 20.4 dB NF, -11 dBm OP1dB and 27 GHz RF bandwidth, and can receive data with 108 Gbps with 16QAM modulation.