Unit 1
Introduction: Bio-signals, Bio-potentials: neural, cardiac, muscular, Chemical, optical signals. Role of amplifiers – Analog and digital signals – Frequency-response band and interfacing.The basic linear feedback loop, Connections between feedback loops and circuits, Root-locus techniques, Eight root-locus rules, Thezeros of a closed-loop system.
Unit 2
Device physics (MOS), Operating regimes, Large signal model – Parasitics, Small signal model, Transconductance, Impedances, Common Source (CS) Amplifier- Gain, Biasing, Interfacing CS to Biology, Diff. Amp. for Noisy Electrodes – Common/ differential mode signals – Common-mode rejection ratio, Common drain (voltage in, current out) – Common gate (current in, voltage out), Current in, current out- Biasing circuits Op-amps-two stage, frequency compensation, sources of noises, Power spectral density,noise in op-amp, Minimum detectable signal.