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A controller which was applied in a power amplifier module for a quad-band cell phone was designed and fabricated in this paper. This controller provides the required DC bias voltage of the quad-band amplifier so that the output of the amplifier reaches the specific power level under various battery output. In addition, a decoder circuit was also included. The outputs of the decoder were used to manage...
Multi-layer piezoelectric thin-film substrates which may have the properties of good temperature characteristic, high reflectivity, high coupling coefficient, high phase velocity, and integratible with semiconductor, have the potential to be used on acoustic devices. The properties of piezoelectric thin-film substrates are determined by the structures of the substrates, piezoelectric material, the...
This paper presents a novel intelligent data mining technique to estimate the optical properties of touch panel (TP) with different layers coating. The neural network (NN) model is developed to be the intelligent tool for the data analyzer. The new computational method based on well-trained NN's weights is used to analyze the influencing factors of TP film's chromatic aberration, i.e. L.a.b. values...
In this paper, a new extraction method is developed for creating a very wide band, from 2 to 85 GHZ, small-signal model for interdigitated, low noise, pseudomorphic high electron mobility transistor (pHEMT). By applying the scalability nature of transistor, a physically related small-signal model is obtained through curve-fitting optimization. This new extraction method also eliminates the need of...
This paper presents a technique, called “nearly equivalent neural network (NN) model” in the application of nonlinear system identification. This technique is expected to adequately to catch the behavior of the nonlinear system. To demonstrate the new technique proposed, the evaporation system of TP decoration film was analyzed. The complex relationship between the film's transmittance...
Surface acoustic wave (SAW) devices are of great interest for chemical and biochemical sensing applications. As the new piezoelectric materials are produced and the development of SAW device substrates expands from single-layer to multi-layer, analyzing the properties of piezoelectric substrates becomes more and more difficult. In this paper, a method that applies finite element (FEM) simulator to...
A new switch design method by applying depletion-mode field effect transistor for dual-band GSM switch diplexer module is presented here. If compared with switch module implemented by using PIN diode, the new module would not only save more currents, consuming only around 0.4 mA in transmitting mode, but also match totally in terms of logic control function and pin-to-pin replacement. If compared...
The coupling-of-modes (COM) theory has been widely used in simulation of surface acoustic wave devices. The accuracy of simulation strongly depends on accurate COM parameters of the piezoelectric substrate. The COM parameters of most single crystal piezoelectric substrates can be obtained in literatures. However, for thin film and multilayer substrate, the COM parameters are often not accessible....
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