Abstract
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, Id = 200 mA and the chip size is 1.5 × 1.8 mm2.
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