Question

Lab - 4.pdf (page 1 of 2) @ Search R2 Prelab Resistor Selection R1 w a. A circuit based on the configuration in Figure 1 1 ΚΩ needs to produce: V2 R3 V1 1) A leftward current of 3.9 mA in R5. V3 2) A top-positive voltage of 1.5 V across R4. 3) A power of 2.4 mW in RL. 4.0V R4 RL = 5602 b. Sketch Figure 1 on a blank sheet of paper, add notations as needed, and apply basic circuit analysis to convert the above requirements into specifications R5 for V2, V3, and V4. Note that V2 and V3 are not the ref 4702 V4 same as the voltages across R4 and RL, respectively. Show organized work in the space adjacent to the Figure 1: Multi-Node Circuit circuit and summarize your results in the Specification column of Table 1 in the datasheet. c. Apply nodal analysis to calculate the values of R2, R3, and R4 that are needed to meet the previously determined node voltage specifications. Show well-organized work on your worksheet and "box" your answers. Pue to the degenerate nature of some of the equations, a simultaneous solution should not be required. d. Select among the resistors in your parts kit to identify the standard values to be used for R2, R3, and R4. Design Verification a. Use the selected values of R2, R3, and R4 along with the values given in Figure 1 to construct and simulate your design in LTspice. Entitle your file as Lab4.asc.

Answer 1

R2 Rp - IKR V2 R3 V3 4V RA RL=5600 3.9 mA R5=470. ref a leftward current of 3.9 mA in R5 ... 3.9 mz Vu-o 470 Vy = 1.833 V a top-positive voltage of 1.5V across Ru .: V2-14 = 1.5 V V2=1.5+ 14 = 1.5+ 1.833 V2 = 3.333 v 2.4 mW in RL a power of P= x² R ... 2.44m = (Va-Vyj² sto .: (V3 - Vu 3² = 1.344 Vz-Vu = 1.1593 V3 = 1.1593 +1.833 Vz = 2.9923 v

current through RL I = V₂ - Vy 1.833 2.9923- 560 Re IL = 2.07mA → apply hodal at V₂ node V₂-V V₂ - Vu V₂ V₃ R2 Ru Rz 3:333-4 R2 3:333-1233 t 3:333- 2.9923 + = Ru O R3 0.667 R2 067 apply + 1.5 Ru + 0.3407 R3 (ll → hodal at Vi node V-12 +vi-va 3.9m=o R2 R, 4-3-333 R2 + 4- 2.9923 1000 = 3.9m 0.667 R2 = (3.9-1.007) m L. 0.667 R₂² 2.8923m R2 = 230.6 1232 I apply nodal at Vs node V₂ - Vy VzV2 13" =0 ot + RE R, 1.1593 560 •3407 R3 1.0072 =0 1000

.3407 Rz = 1.0625 m R3 320.66532 substitate R₂ and R3 in (1) -0.667 & 230.6123 1.5 Ru t a3487 320.6653 = Ru=819.752or