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This paper realized a single-ended direct conversion front-end transmitter for Worldwide Interoperability for Microwave Access (WiMAX) application. The on chip output matching network is designed in the power amplifier driver to provide the convenience of measurement and further integration with a power amplifier, which is usually designed as a single input. Moreover, the gain adjustment with 1 dB...
Design of a broadband low imbalance active balun in a 0.35-μm SiGe BiCMOS process for microwave applications is presented in this paper. The proposed active balun employs Darlington pairs in a differential pair to archive broad and flat bandwidth with good amplitude/phase matches. In addition, a current mirror with a small inductor is realized as an ideal current source to further reduce signal loss...
In this paper, we report both circuits design and system simulations using highly-efficient monolithic SiGe class-E power amplifier (PA) with an open-loop envelope tracking (ET) technique for mobile WiMAX/Wibro applications. The 1-stage and 2-stage class-E PAs were designed and fabricated in a 0.18 mum BiCMOS SiGe technology. The 1-stage class-E PA achieved peak power added efficiency (PAE) of 62%...
This paper presents two millimeter-wave lumped-distributed 90deg and 180deg power splitters fabricated in the back-end-of-the-line (BEOL) of a 0.18 mum SiGe BiCMOS technology. The 180deg and 90deg power splitters based on mixed lumped-distributed-element three-port Wilkinson power divider with phase shifters at the outputs are shown to achieve an amplitude balance of better than 0.05 dB and 0.21 dB,...
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