Question

19 of 21 Problem 18 Assume that the op amp is ideal and operating in its linear region. Select the combination of resistor Icc values that gives the cascaded op-amps an overall gain of -2500 R. A. Ri 15 k2, R2 300 , Rs = 1 k2 , R - 50 k2 B. Ri 300 , R-15 k, Rs 1 k2, Ra = 50 k2 0 , R15 k, R I k2, R=49 ks2 C. Ri R 600 Q, R2 30 k, R = 500 , R4 None of the other answers is correct. E. 24 ko F.

Answer 1

Given R2 M- M Vo let 1Kinverting amp 1 noninvevting oP amp Since juppley to tve tCminal Since Supply given to timinal cascaded The se tuoo formula Gan of Vout Rp inverting opamp ^ Vin Gain af Vout non-inverting opampP 1-1 Vin Ri LLLLLLLLLI

Vout - - Vin 2nd opamp A- Vont Vin muttply R4 R3 RI Vo - R2 R3/ Given Vo - asoo Then Ry -R2 -2SDO= R R4 R3 oplrions check .- R3=Ik Ry5o K ; A) Ri15 k; R2 = 300 Sub in 300

(51) 50 LtS .02 9500 buaion (B)» Ry- 50k sub 5 K 1- TE 300 T14 50 1000 2500 ) 2550.0 (B) u buaem R3 1k,Ry = 49K R2=15k / C) R,-300n, in C 5K 1149k 300 locd [50 50 X50 atisried R500 a500 c) Conect

Ryk R2 Is R2-49 1 (D). R1 30o , 15 k 49 k 300 >) ooo 50 D) wong Ry24k R2 Soo E). ,60o, R2 = 30k, / 30 K 600 oas 2.usk LE) Henca opten ) Sert'sh corect (c) OMS