Bohai Zhang

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—This paper presents a D-band power amplifier for high-speed communication system. The capacitive effect of interconnection via on transistor performance at high frequency is analyzed and a new via structure is employed to reduce the capacitive effect. The on-chip matching technique for high frequency amplifier is analyzed and the thin-film microstrip line(More)
In this paper, a broadband high-efficiency supply modulator is proposed. This modulator, with a node controlled by ΔΣ modulator's output, consists of a conventional Class-E amplifier and a Class-E rectifier. The configurations and operation principles of this modulator are introduced to explain the envelope reconstruction process. The(More)
This paper introduces a new matching topology in the design of approximated continuous Class-F PAs for obtaining high efficiency in wideband, and justifies this topology reasonable by analyzing waveforms at the current-generator and package plane of device. The real part of impedance in this proposed topology can achieve the characteristic of nearby zero(More)
Novel microstrip multi-section coupled-line resonator is proposed. This kind of resonator can give us more flexibilities to design the microstrip line filter since it covers two different regions to settle the coupling coefficients of the filters and these two different regions are connected by two un-coupled transmission line. A highly selective bandpass(More)
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