Device characterization and analog circuit design for heterojunction FETs Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n296x2360

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  • Present day data processing technology requires very high speed signal processing and data conversion rates. Traditionally, these circuits have been implemented in silicon MOS technology, whose high speed performance is limited, due to inherent material properties. Though relatively immature compared to silicon technology, GaAs integrated circuit technology appears to be a potential vehicle for realizing high-speed circuits because of its high electron mobility and low parasitic capacitance. One major drawback of GaAs technology has been the lack of complementary technology in contrast to silicon where CMOS technology has greatly facilitated the development of analog ICs. This thesis investigates the suitability of complementary GaAs Heterojunction FET integrated circuit technology for the realization of high sample-rate switched-capacitor circuits. In order to yield an accurate device model for the design work, model parameters of both n and p GaAs Heterojunction FET devices are extracted from measurement results. Based on the extraction results, a set of analog building blocks are presented. These circuits include a high bandwidth operational amplifier and a fast settling switch which are essential for high sample-rate circuits. A second order switched-capacitor low pass filter sampling at a clock rate of 100MHz is designed using the above building blocks. The designs studied predict better high frequency performance for C-HFETs compared to Si CMOS technology.
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