Pre-laboratory exercise

1. (2pts) For the summing amplifier in Fig. 1 with power supplies +7V, choose R2 to have Vout= -(Vini +2Vin2),

if R1 R3 = 10KN.

2. (2pts) Use CIS Capture/Pspice to verify your hand-calculation and confirm that the circuit operates as a summing amplifier.

For Vin1 use a VSIN source with the following settings (VOFF-0, VAMPL=1, FREQ=1kHz, AC=1). For Vin2 use VDC

source with a value of 2Vdc. Run a Time Domain (Transient) simulation profile for 2ms.

3. (2pts) For the differential amplifier in Fig. 2 with power supplies +7V, choose R1 to have Vout= (Vin2 - Vint),

if R2 R3 R4 = 10K

4. (2pts) Use CIS Capture/Pspice to verify your hand-calculations and confirm that the circuit in Fig.2 operates as a differential

amplifier. For Vin1 use a VSIN source with the following settings (VOFF-0, VAMPL=1, FREQ=1kHz, AC-1). For Vin2

use VDC source with a value of 2Vdc. Run a Time Domain (Transient) simulation profile for 2ms.

5. (2pts) Use OrCAD Capture /Pspice to check the common-mode gain and CMRR for the circuit in Fig.2. For Vinl use a

VSIN source with the following settings (VOFF-0, VAMPL=1, FREQ=1kHz, AC-1). For Vin2 use VDC source with a

value of 1Vdc. Run a Time Domain (Transient) simulation profile for 2ms. Use the cursors to find the common-mode gain

and differential-mode gain then calculate CMRR.