4.6 Article

A 28-GHz Bidirectional Active Gilbert-Cell Mixer in 90-nm CMOS

Journal

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
Volume 31, Issue 5, Pages 473-476

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2021.3061658

Keywords

Mixers; Transistors; Radio frequency; Transconductance; Switching circuits; Logic gates; Gain; Bidirectional; Gilbert-cell; IF bidirectional amplifier (IFBDA); passive mixer

Funding

  1. Ministry of Science and Technology, Taiwan [MOST 108-2218-E-002028, MOST 109-2221-E-002-170]
  2. National Taiwan University, Taiwan [NTUCC-109L892504]

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The bidirectional active mixer based on Gilbert-cell topology operates at 28 GHz and can achieve both up- and down-conversion. It utilizes an IF bidirectional amplifier to compensate for the conversion loss of the Gilbert quad switch. With a low total dc power consumption of 8.4/6.4 mW under 1.2-V supply voltage, the mixer demonstrates a low conversion loss and LO power compared to traditional bidirectional passive mixers.
A bidirectional active mixer based on Gilbert-cell topology is proposed and realized in 90-nm CMOS at 28 GHz. The offered mixer can achieve both the up- and down-conversion under 1-dBm local oscillator (LO) power by adjusting the Gilbert quad switch's gate bias. An IF bidirectional amplifier (IFBDA) is adapted to compensate for the conversion loss (CL) of the Gilbert quad switch. The measured peak conversion gain (CG) is -2.14/-3.28 dB at 28-GHz, and the 3-dB bandwidth is 7/6 GHz in transmit (Tx)/receive (Rx) mode. Total dc power consumption is only 8.4/6.4 mW for Tx/Rx mode under 1.2-V supply voltage. Compared with the traditional bidirectional passive mixers, this mixer demonstrates a low CL with a low LO power.

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