Wideband sub-harmonic mixer incorporating short-circuited band-pass filter

Abstract

A Q band sub-harmonic mixer with wideband radio frequency (RF) and high intermediate frequency (IF) is proposed. The mixer employs a short-circuited band-pass filter (BPF) and a RF-IF diplexer, which provide proper terminations for the IF, RF, and local-oscillator (LO) signals simultaneously, and reject the major unwanted mixing products. A Q-band subharmonic mixer is designed and fabricated. The measured results show that the proposed sub-harmonic mixer can operate from 40 to 50 GHz for RF and support up to 10 GHz for IF bandwidth. As a down-conversion mixer, the measured conversion-loss is less than than 10.5 dB over the available RF band, while the minimum conversion-loss is about 6.8 dB at an RF of 45 GHz and IF of 5 GHz. As an up-conversion mixer, the measured conversion-loss is less than 11 dB over the available IF band, while the minimum conversion-loss is about 7.5 dB at an RF of 45.5 GHz and IF of 5.5 GHz.

30–43 GHz cascode sub-harmonic mixer in 0.13-µm CMOS technology

“…However, they suffer higher conversion loss and noise performance degradation. SHMs using an anti-parallel diode pair (APDP) topology show wide operation band and zero dc power [2], but suffer from undesirable distortion and low LO-RF isolation [3]. The sub-harmonically gate-pumped and source-pumped resistive FET mixer has been commonly used in recent years [4,5,6,7,8,9].…”

Design of a millimeter-wave third-harmonic mixer using substrate integrated waveguide balun

“…The harmonic mixer is widely used in millimeter-wave region, because it significantly reduces the frequency of the local oscillator (LO), thus simplifies the design of the LO source [1,2,3,4]. Compared with even harmonic mixer with a pair of antiparallel diodes, odd harmonic mixer has a better performance of radio frequency (RF)-to-LO isolation due to its balanced configuration.…”