Design of 20-44 GHz broadband doubler MMIC

摘要

This paper presents the design and performance of a broadband millimeter-wave frequency doubler MMIC using active 0.15 μm GaAs PHEMT and operating at output frequencies from 20 to 44 GHz. This chip is composed of a single ended-into differential-out active Balun, balanced FETs in push-push configuration, and a distributed amplifier. The MMIC doubler exhibits more than 4 dB conversion gain with 12 dBm of output power, and the fundamental frequency suppression is typically – 20 dBc up to 44 GHz. The MMIC works at VDD = 3.5 V, Vss = – 3.5 V, I_d = 200 mA and the chip size is 1.5 × 1.8 mm~2.