Week 7 day 11

Today's exercise Gain= -Rf/Ri we get -3v. Since the op amp goes from 0v-9v our square wave gets chopped off to zero with an amplitude of 300mv.

Another exercise using nodal analysis  where vb=vs=0.

A calculation of a non inverting op amp V0=(1+Rf/Ri)Vi.

For Summing amplifier V0=-Rf(V1/R1 + V2/R2+ V3/R3).

The circuit for the summing inverter which increased voltage and did not saturate after our second trial.  We started with R1=1.8Kohms and R2=3.6 Kohms.  We switched the values to achieve non saturation.

The graph of our two circuits blue is the circuit that did saturate and red is the one that did not saturate.

In this exercise we found R2 and R4 to be 20k in order to get a gain of 2.

Difference

V0=R2/R1(V2-V1)

Just as we predicted.