Question

it would be awesome if you could solve this step by step. use of multisim is optional

Lab Manual ECE-2111 Circuit Theory-I SECTION C: Design an Opamp circuit for which the output voltage will be of the following form Vou = 2V - 32 Use MULTISIM for your design.

Answer 1

Solution: To design the op.Amp circuit that meets the given relation - yout = 20,- 3v e voet Using Two-stage op. Amp ciruit - M *Staget op. Amp Circuit +large-2 op. Amp Circuit -- Assurning the op. Amp to be ideal therefore current entering through inverting and non-inversing input terminal of op. Amp is zero Que to virtual ground of As opentoop gain of op. Amp - an ideal op. Amp is infinite oi vout = Ao Cout - V) veut = f(ut -09) O » ut=g-

Here vt = UB VEVA As node'B' is directly connected to ground i VB to wat and due to virtual ground - 77 = v ie; UB=VA = Ovolt. Now for stage-t Op Amp circuit - Apply Ke At Node 'A' – = AR VA = OV i V RF - - Vs - Voi = - RF -0 AX for Stage 2 op. Amp circuit : Here Node 'D' at non-inverting Pin of input terminal is directly connected to ground. therefore 5 Voz ovalt As vt=v- BE - "Ve = Vo = O volt Voi omien a Vout Using KU A Node C -

ve 1 2 * R * Read Ve 1 / + 1 t17 - vout = Voit le R2 R REZ As vezovat ..but a more in the - from quasion og voy a FPGAVE - Vous a casa te rte veut = are things that when to On comparing er 9 with giren outfut equation - vout = 2V, – 3 Va :: RF, X Rf 2 = 2 and RFL = 3 RIERE for R2=2k2 Value of Rf * needed Rf₃ = 3 R [R&z= 6k2

- for Rg = 342 set RF = Rp = 1 K2 o final circuit diagram - 6K2 M 12 3621 N ovout = 24, -3 ug QK Qring multisim we can verity Our result - • for V, ad moet vog eg volt vout = 2 –(3X2) vout = -4 volt for V, = -1 volt V2 = 105 volt vout = -2 -3X1.5) = -2-4.5 Vout 2 -6.5 volt and so on. Anewes

Rf2... GkQ : V(dc): -4.00 V Vout ..R2 3kQ OPAMP. 37 VIRTUAL OPAMP. 3T VIRTUAL ...........R3 . . . . . . . . . . . . . . . . . V2............ Using D.C bias point voltage display using Voltage probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output voltage (Vout) for Vi=1 V and V= 2V using MULTISIM

. .R 1 . . . . . . . . . . Rf2 . . . . 1.0ko 6ko Vidc): -6.50 V 1.OK OPAMP: 3T_VIRTUAL OPAMP. 3T VIRTUAL: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. . . . . OH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output Voltage for V1=-1 Vand V3 = 1.5V Vout=6.5 Volt using MULTISIM (Simulation result exactly equal to the calculated values )