Question

3) It is desired to control the output by applying feedback to an op-amp circuit with transfer function H(s) = sta . The transfer function of the feed bock circuit is G(s), the transfer function of the circuit obtained by applying feedback is H(s) olrak üzere a) find G (s) to be Ho(s)=0.5 b) Design and draw the circuit providing the G(s) transfer function using op-amps. c) Design and draw the cirevit providing the Ho(s) transfer function using op-amps.

I couldn't do this question from the electronics lesson.

Answer 1

H(S) S St2 (ه) H6(S) - 0.5 RCS) Gos) c(s) RCS) HCS) H05) 1 + H65). H.(5) GCS) /s+2 Hops) s I+0.5.5 Sta S+2 +0.55 Gcs) S as 1.5sta 6765) 35+ 4 (6) This GCS) is a high pass filter. Let us Consider simple HPF circuit using op-amp and capacitor. R2 R Venomoth ci + Vouti Vout Vouti Vin N|N Zz - Rz and Z, a Ritsc, 1) Ricist' R2 Vouti Vin sc, R, 6,5t SCI Yout R₂C, s Vio Cscanned with CamScaveicis + 1

a buffer circuit Transforf". I lout, R2/RS = V? st RICI Vout= - Yout, - Vout) = This is Vout Vio (R2/R) $+(VR,C) GCS) bhas) (R2/R)S st YBCI we have Gls) = 2/35 35+ 4 st 4/3 So, Ra RI 2 3 select R2 = 2k2 Then Ri = 312 RICI 4 3 4,- 3 4R, 0.25 mF 3 4x3k (=250 ME 2k2 312 2504F R2 Vin anh Vout Ri C, CScanned with CamScanner 1 TE

a buffer. 3 a (6) Ho C) = 0.5 use inverting amplifier with and first Inverting amplifier has a 0.5 gain of Second with a Unity gan inverting amplifier (buffer) R2 un Vpn Ri Vout llout vis R2 Bu HG CS) R2 - 0.5 HGCs) 2 ie Rz 0.5 Ri for R2 = Ikh Then Ri= ak2 CScanned with Camscanner