Cours 5: Blocs micro-électroniques de base

Question 1

Ideal OpAmp

Answer 1

Gain infinity, no offset voltage, Rin infinity, Rout zero, bandwidth infinity

Question 2

CMRR

Answer 2

CMRR = Gd / Gc

Question 3

Op Amp Output swing

Answer 3

The op-amp output stage design and the load current.

Question 4

Requirements for 3-opamp Instrumentation amplifier

Answer 4

Differential gain/input, high input impedance, common mode not amplified, use voltage follower or inverting amplifier for buffering

Question 5

Comparators characteristics

Answer 5

positive feedback, use a bistable circuit similar to the Schmitt trigger, digital output, threshold adjusted by transistors on + input

Question 6

Full wave precision rectifier

Answer 6

simple resistor diode bad when below 0.7 V, place a diode with the feedback loop

Question 7

Simple integrator issue

Answer 7

output voltage drifts towards saturation because of bias currents (when input voltage is centered around zero aka no DC)