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This letter presents a simple method to realize high-efficiency second-harmonic-tuned (2HT) power amplifier (PA). Compared with other works, this method can realize optimum fundamental and second-harmonic impedance matching accurately, thus to achieve a relatively high efficiency through only controlling the first two frequencies. Besides, to avoid the problem of transmission line with high characteristic...
A compact microstrip band-pass filter (BPF) with ultra-wide-band rejection and compact size by using transformed radial stubs (TRS) is presented. Three TRS cells and two shunt stubs are used in the design. The implemented 2.5 GHz BPF with a bandwidth of 19% using three TRS cells demonstrates more than 22-dB rejection from 3 to 23 GHz (up to 9.2f0). The measured passband insertion loss is 2.15dB and...
Wideband power amplifiers (PAs) with high power-added efficiency (PAE) are required by software-defined radio and high-data-rate communications. A PA in Class-AB, which can provide linear amplification with PAE better than Class-A, has been reported in [1] to achieve bandwidth larger than one octave. However, Class-AB operation generates a large amount of 2nd-harmonic current at the transistor output,...
This paper presents a new multi-conversion super heterodyne architecture for 60GHz broadband wireless application. The proposed design consists of a three-stage conversion with the help of a 24GHz VCO and a divider. The local oscillator frequency stands far away from RF and both IF signals reduce inter-modulate interference. The first and second mixers sharing the same 24GHz VCO relax the complexity...
This paper presents a novel 24/36-GHz double conversion heterodyne architecture for IEEE 802.15.3c (60-GHz) applications. The selection of the first local oscillator frequency as 36-GHz gives rise to an intermediate frequency that yields significant cost advantage by reusing the 24-GHz architecture adopted by the automotive industry for both the receiver and transmitter second stage frequency translation...
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