Laboratory report

D M A E

EPARTMENT OF ECHANICAL AND EROSPACE NGINEERING

ELECTRONICS COURSE

2022/2023

LABORATORY REPORT

Circuits with OP-AMPs

Denise Cacciola

1 Instrumentation

1.1 DC power supply

This device allows providing a 10 V power supply to the amplifier.

Figure 1.1: DC power supply

1.2 Signal generator

This device supplies the input signal to the amplifier, in our case at a frequency of 1 kHz. It contains

information on the shape of wave: sinusoidal type.

Figure 1.2: Signal generator

1.3 Oscilloscope

This device is required for synchronization. It displays the incoming and outgoing signal and compare

them. Figure 1.3: Oscilloscope

2 Inverting Amplifier 10 Ω

Figure 2.1: Circuit of inverting amplifier with the feedback resistance of

We analyze the amplifier response by varying the feedback resistance in the non-inverting

configuration, keeping below the cutoff frequency. We connect the non-inverting branch to ground

with the black cable, while the red cable connects the input signal generated with the wave generator.

By a purple cable we connect one of the resistors with the pin of the amplifier output in order to

counter-react the amplifier. Figure 2.2: inverting operational amplifier

Figure 2.3: Exit signal with a feedback resistance equal to 1

The output is 180 degrees out of phase with the input and unamplified, the magnitude of the gain is

!

! = 1 as demonstrated in exercise 1 of a low-pass amplifier with low frequencies; in fact if we try

!

" Ω

with a feedback resistance equal to 2 , the amplitude of the signal will be doubled and out of phase

by 180 degrees.

Figure 2.4: Exit signal with a feedback resistance equal to 2

Figure 2.5: Exit signal with a feedback resistance equal to 10