Noninverting Amplifier

(a)

2. The circuit for this step is the noninverting amplifier shown in Figure 12-11.

Using the measured resistances from step 1, compute the closed-loop gain of

the noninverting amplifier. The closed-loop gain equation is given in the

text as Equation 12-8. Enter the computed value in Table 12-10.

(e)

(f)

V₁=

500 mV

1.0 kHz

Application Activity

PROVE PERME

(b)

(c)

Calculate your using the computed closed-loop gain. Record in Table 12-10.

Change the circuit to the noninverting amplifier circuit shown in Figure 12-

11. Set the input for a 500 mVpp sine wave at 1.0 kHz with no dc offset.

Record the measured setting in Table 12-10.

(d) Measure the output voltage, Vor Record the measured value in Table 12-10.

Measure the feedback voltage at pin 2. Record the measured value. Notice

that the voltage at pin 2 is not near ground potential this time.

Place a 1.0 M2 test resistor in series with the input from the generator.

Observe the output voltage with the series resistor in place. You can think of

the voltage change as being dropped across the test resistor, the rest is across

the input resistance. You can use this to indirectly find the input resistance.

Record the measured input resistance in Table 12-10.

Table 12-10

+15 V

HE

110μF

741C

44

10μ

-15 V

Figure 12-11

www

116

R₁

10 k

R₁

1.0 kn

Parameter

Vin

ACKNI)

Vout

Ve

Rin

Computed Measured

Value

Value

500 mVpp