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A novel low-power EEG readout front-end featuring a current-mode instrumentation amplifier (CMIA) followed by a 4th-order gain-compensated source-follower-based lowpass filter (LPF) is proposed. The CMIA is of current-conveyor topology and is chopper-stabilized to improve the common-mode noise rejection and suppress the dc-offset and 1/f noise. The typical gain-loss problem of source-follower-based...
This paper describes the design of current mode instrumentation amplifier (CMIA) for portable biosignal acquisition system. The CMIA topology is based on voltage mode operational amplifier (op amp) power supply current sensing technique. Op amp mismatch and precise current mirrors are two design challenges of this topology. A simulation analysis is conducted based on an implementation in a CMOS 0...
The operation of the mid-wave infrared (MWIR) HgCdTe cylindrical electron injection avalanche photodiode (e-APD) is described. The measured gain and excess noise factor are related to the collection region fill factor. A two-dimensional diffusion model calculates the time-dependent response and steady-state pixel point spread function for cylindrical diodes, and predicts bandwidths near 1 GHz for...
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