Title :
400 GHz HBT Differential Amplifier Using Unbalanced Feed Networks
Author :
Hacker, J. ; Urteaga, M. ; Lin, R. ; Skalare, A. ; Mehdi, I. ; Rieh, J.-S. ; Kim, M.
Author_Institution :
Teledyne Sci. Co., Thousand Oaks, CA, USA
Abstract :
A terahertz differential eight-stage amplifier fabricated using state-of-the-art 125 nm double-heterojunction bipolar transistors (DHBT) is presented. The four-port unit-cell chain is designed for optimum forward differential gain with no even and odd-mode reverse gains. Unbalanced single-ended feed networks are added to preserve the amplifier gain without inducing oscillations. The proposed feed scheme is validated by a stable amplifier operation in 325-to-450 GHz range with the peak gain of 22 dB at 375 GHz.
Keywords :
differential amplifiers; heterojunction bipolar transistors; DHBT; HBT differential amplifier; amplifier gain; double-heterojunction bipolar transistor; four-port unit-cell chain; frequency 325 GHz to 450 GHz; frequency 400 GHz; gain 22 dB; optimum forward differential gain; size 125 nm; stable amplifier operation; terahertz differential eight-stage amplifier; unbalanced single-ended feed network; Feeds; Gain; Heterojunction bipolar transistors; Impedance matching; Indium phosphide; Noise; Wireless communication; Differential feed; InP HBT; terahertz amplifier;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2012.2214767
