Question

If the input impedance is defined as Zin = Vds, find the input impedance of the op amp circuit given below when R1 = 13 k12, R2 = 20 k12, C1 = 10 nF, C2 = 20 nF, and @ = 5000 rad/s. Please report your answer so the magnitude is positive and all angles are in the range of negative 180 degrees to positive 180 degrees. C I, R R2 V. C2 Zin The value of Zin = 2 1o) k12.

Answer 1

Given: Ri= 13 kn R2 = 2okh saia lont : C₂ = zouf & wesooo radec * X, wscy Reactance -jxc, a ajooks Sooox lotion * Xcq - s Reactance -jXc2 = -loka اما 5000 x cox1.9 Iz circuit : -jzok th + lokn M roker V oA + ik dominent negative feedback. Va Il -jioket Vs од i vistual shost possible. vtav * from circuit v Vo vt vaavo * Due to high input impedance it circos - vt then from circuit II- Ila Vo -jlok -jlok ok from circuit : Ia Is I 1 → Is vo -jiok Iz * Voltage division -jiok Vot Na - Vo lă =% [tag] zok-ilok va-vo te Now I 2 = No + 2j. V ovo -jzok I2 -jzok -jlok Vo & Is + d22 Vo Vo - jlok 1 j vo -jook -slok [intj] -jlok -jlok (142) Is Itj Vo : Is -jlok (14) V. (1+2;]

et From From circuit i Vsa s (3) + % كل + (3) عل = ا (42) (ه)) الانتها) من . داية Is 13 k (1+) Citi) ده لے کا 13 EZs = اک املا 7 ا ا (كان - 3]) (14) عن - 3 == IS (3) Es 3 اه3 ع /-3q.205 ے