Answer Happy

1. INTRODUCTION The purpose of this practical simulation is to reinforce some of the more important properties and uses of Differential Amplifier. The readers should make themselves familiar with the properties of the Differential Amplifier. The behaviour of the Differential Amplifier will also be considered under certain conditions. 2 Differential Amplifier Circuit Analysis The circuit in Figure 1.1(a) is called a Differential Amplifier. This circuit has two inputs, one applied at the inverting input and the other at the non-inverting input of the Differential Amplifier. Figure 1.1(b) shows two-cascaded non-inverting amplifiers. The later also has two inputs, both inputs applied at the non-inverting inputs of the two-cascaded non-inverting amplifiers. Differential amplifier circuit analysis utilises superposition theorem to obtain input-output relationship. R V1-W R2 w R3 R4 R w R: V20-W R2 w VO + R4 (b) (a) Figure 2.1: Differential Amplifier Circuits: (a) with One Op-Amp, (b) with two Op-Amps 2.1 Differential Amplifier Circuit Analysis with one Op-Amp [10%) (a) Find an expression for the output voltage, V. in Fig. 1.1 (a). (b) Let Vi = 0, find an expression for the output voltage, V, in terms of V2. (C) Let V2 = 0, an expression for the output voltage, V, in terms of V.. (d) If the ratio of (-/R2) = (f:/RĄ), find an expression for the output voltage, Vo. (e) What observation did you make from these input-output relationships under different inputs combinations? 2.2 (10%) Differential Amplifier Circuit Analysis with two Op-Amp (a) Find an expression for the output voltage, V, in Fig. 1.1 (b). (b) Let V1 = 0, find an expression for the output voltage, V, in terms of V2. (C) Let V2 = 0, an expression for the output voltage, V, in terms of V.. (a) If the ratio of (R2/2) = (3/64). of(F2/R2) = ($=/r.), find an expression for the output voltage, Vo. ,