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4.3 Summing Amplifier (4-5) 1. Design an op amp summing circuit that performs the operation vo = -(2.14v1 + 1.00v2 +0.47v3). Use not more than four standard-value resistors with values between 10 k 2 and 100 k12. Refer to the resistor parts list in Appendix A on page 159 2. Draw the output waveform vo for the input waveforms vi and v2 shown in Figure 4.4 and v3 = 4.7 volts. 3. State the minimum and maximum values of v.. V, a 1v+ ti 5 10 t(ms) - IV کہ A 11 mum 2.5 5 10 Z(ms) Figure 4.4: Input waveforms for Problem 4.3 NI Multisim Measurements 1. Enter the op amp summing circuit that you designed earlier. Use the following components and instruments: • Virtual three-terminal op amp model OPAMP_3T_VIRTUAL • Piecewise-linear voltage source PIECEWISE_LINEAR_VOLTAGE for vi • Pulse voltage source PULSE_VOLTAGE for v2 • Four-channel oscilloscope 2. Plot v, and the three inputs vī to v3 with the four-channel oscillo- scope. 3. Use the oscilloscope display cursors to identify the minimum and maximum values of vo. Additional Multisim tips for this problem: O Specify the PWL voltage source waveform by entering endpoints of straight lines as time-voltage pairs. The triangle waveform of Fig- ure 4.4 on the previous page requires only three entries to specify a complete period. Select “Repeat data during simulation" to create a periodic triangle waveform. • Three fields need to be adjusted for the pulse voltage source to make it match the required square waveform shape: "Initial Value," “Pulse Width," and “Period." NI Multisim video tutorials: • Basic operation of the four-channel oscilloscope: • Piecewise linear (PWL) voltage source: • Pulse voltage source: • Find components by name: