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A tunable 140GHz analog phase shifter with high linearity performance

: Thome, F.; Diebold, S.; Schlechtweg, M.; Leuther, A.; Ambacher, O.; Kallfass, I.

Institute of Electrical and Electronics Engineers -IEEE-:
7th German Microwave Conference, GeMiC 2012 : 12-14 March 2012, Ilmenau
New York, NY: IEEE, 2012
ISBN: 978-3-9812668-4-9
ISBN: 978-1-4577-2096-3 (Print)
Art. 6185179, 4 S.
German Microwave Conference (GeMiC) <7, 2012, Ilmenau>
Fraunhofer IAF ()

An analog phase shifter for applications around 140GHz is presented. The MMIC is based on our in-house 100nm InGaAs mHEMT technology and has a chip size of 1mm 2. The circuit uses two quarter-wavelength transmission lines and two tunable impedances governed by a control voltage. As a result, the signal phase can be controlled stepless with a maximum shift of about 60°. Over the whole tuning range the gain ripple is less than 0.3dB and the phase shifter has a conversion gain of about -3.5dB. Because of its passive topology the circuit shows a very high linearity.