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A 220-260 GHz medium power variable gain amplifier MMIC with low phase variation

: Müller, Daniel; Fink, M.; Vangerow, Christine von; Tessmann, Axel; Leuther, Arnulf; Zwick, Thomas; Kallfass, Ingmar


Pasya, I. ; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Asia Pacific Microwave Conference, APMC 2017 : November 13-16, 2017, Renaissance Kuala Lumpur Hotel; Proceedings
Piscataway, NJ: IEEE, 2017
ISBN: 978-1-5386-0640-7
ISBN: 978-1-5386-0639-1
ISBN: 978-1-5386-0641-4
Asia Pacific Microwave Conference (APMC) <2017, Kuala Lumpur>
Fraunhofer IAF ()

A variable gain amplifier (VGA) operating in the WR3 frequency range (220 to 325GHz) with low phase variation is presented. The VGA is carried out as balanced amplifier with a three-stage cascode amplifier in each path. The small-signal gain is 24.2dB with a 3 dB bandwidth of 43GHz ranging from 218.8 to 261.8GHz. Within a gain control rangeof 17dB the phase variation is below -5◦ and +10◦. The large signal behavior shows a maximum output power Psat of 7.4 dBmat 240GHz with a saturated gain of 12dB. The MMIC was fabricated in a 50nm InGaAs technology and has a chip size of1.25 × 0.75mm2.