March 26th

Inverting Voltage Amplifier
In this lab, we used a single operational amplifier (OP27) to implement the process of multiplication by a negative constant.

We used the equation Vout = -R2/R1 * Vin to get that R2/R1 should be around 2 to provide a gain of double the voltage. Then we used R1 = 1.8k ohm, and R2 = 3.6k ohm because they are the standard resistors and R2/R1 is 2.

This is how the circuit was connected.

This is a Vin/Vout table of the circuit. Vout/Vin is about -2

In the picture, we can see there are limits on how much Vout can output. In theory, the upper and lower limit should be +/- 5V. But really, the upper limit is 4.18 and the lower limit is -3.38. This was caused there is no perfect op-amp. Better op-amp can have its limit close to the rail voltages.