Complementary heterostructure FET (CHFET) readout technology for infra-red focal plane arrays

Mathematics – Logic

Scientific paper

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Field Effect Transistors, Focal Plane Devices, Gates (Circuits), Heterojunction Devices, Logic Circuits, Readout, Electron Mobility, Energy Gaps (Solid State), Infrared Detectors, Signal Processing

Scientific paper

This paper describes a CMOS-like readout technology using GaAs heterostructure field effect transistors. Bandgap engineering techniques are described which provide complementary p-channel and n-channel GaAs FETs attractive for performing advanced signal processing functions with minimal power consumption and with precision operation in harsh environments. At 77 K, n&p channel CHFETs exhibit amplification factors of 6.7 and 2.3 mA/V-squared, respectively, with nearly ideal subthreshold characteristics and no I-V kinks or hysteresis. CHFET ring oscillators at 77 K attain propagation delays under 200 pS/gate while maintaining standby power dissipation under 1 micro-W/gate and switching power of 0.1 micro-W/gate/MHz. A simple operational amplifier exhibited 100 dB open loop gain at 65 K with 80 pA input leakage and 500 micro-W total power consumption.

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