Microwave Characteristics of an Independently Biased 3-Stack InGaP/GaAs HBT Configuration


This paper investigates various important microwave characteristics of an independently biased 3-stack InGaP/GaAs heterojunction bipolar transistor (HBT) monolithic microwave integrated circuit (MMIC) chip at both smallsignal and large-signal operation. By taking the advantage of the independently biased functionality, bias condition for individual transistor can be adjusted flexibly, resulting in the ability of independent control for both small-signal and large-signal performances. It was found that at small-signal operation stability and isolation characteristics of the proposed configuration can be significantly improved by controlling bias condition of the second-stage and the third-stage transistors while at large-signal operation its linearity and power gain can be improved through controlling the bias condition of the firststage and the third-stage transistors. To demonstrate the benefits of using such an independently biased configuration, a measured optimum large-signal performance at an operation frequency of 1.6 GHz under an optimum bias condition for the high gain, low distortion were obtained as: PAE = 23.5 %, Pout = 12 dBm; Gain = 32.6 dB at IMD3 = −35 dBc. Moreover, to demonstrate the superior advantage of the proposed configuration, its small-signal and large-signal performance were also compared to that of a single stage common-emitter, a conventional 2-stack, an independently biased 2-stack and a conventional 3-stack configuration. The compared results showed that the independently biased 3-stack is the best candidate among the configurations for various wireless communications applications.

DOI: 10.1109/TCSI.2016.2637406

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@article{Luong2017MicrowaveCO, title={Microwave Characteristics of an Independently Biased 3-Stack InGaP/GaAs HBT Configuration}, author={Manh Duy Luong and Ryo Ishikawa and Yoichiro Takayama and Kazuhiko Honjo}, journal={IEEE Trans. on Circuits and Systems}, year={2017}, volume={64-I}, pages={1140-1151} }