Inverting OP Amp

1. Construct the inverting amplifier according to the wiring diagram below.

Here is the data sheet for the 741 Op Amp

Use and as starting values.

2. Insert a 0.01 F capacitor between ground and both Op Amp power supply input pins. The Power supply connections for the Op amp are not shown in the above circuit diagram, check the data sheet.

Gain measurements

1.) Measure the gain as a function of frequency between 100 Hz and 2 MHz for three values of = 10 k, 100 k, 1M. Keep at .

2.)Graph the above measurements with the Gain in units of decibels (dB) and with a logarithmic scale for the frequency axis.

Impedance

Input Impedance

1. Measure for the 10 fold and 100 fold amplifier at ~100 Hz and 10 kHz frequency.

Output Impedance

1. Measure for the 10 fold and 100 fold amplifier at ~100 Hz and 10 kHz frequency. Be sure to keep the output () undistorted

and

Use the above equation and two measurements of , , and to extract and .

1. measure for = 1 k, = 100 k, and=0 (grounded).
2. measure for = 10 k, = 1 M, and=0 (grounded).
3. You can now construct 2 equations with 2 unknowns and .

Now we will put in a pull up resistor as shown below.

Instead of the current we have the current

Use the same technique and resistors from the previous section to construct 2 equations and 2 unknowns and extract , keep =0.

The offset Null Circuit

1. Construct the offset null circuit above.
2. Adjust the potentiometer to minimize with .
3. Use a scope to measure the output noise.

Slew rate

Measure the slew and compare it to the factory spec.

Power Supply Rejection Ratio

1. Set = 0.
2. Measure while changing

Output voltage RMS noise

Measure the RMS noise in when = 0 .

Capacitors

Revert back to the pull up resistor

Capacitor in parallel with

1. Select a capacitor such that when = 10 kHz.
2. Add the capacitor in parallel to so you have the circuit shown above.
3. Use a pulse generator to input a sinusoidal voltage
4. Measure the Gain as a function of the frequency and plot it.

Capacitor in series with R_1

1. Select a capacitor such that when = 1 kHz.
2. Add the capacitor in series to so you have the circuit shown above.
3. Use a pulse generator to input a sinusoidal voltage
4. Measure the Gain as a function of the frequency and plot it.