दिए गए आउटपुट वोल्टेज का उत्पादन करने के लिए दिए गए परिपथ में आवश्यक इनपुट प्रतिरोध का मान क्या है?

F1 Shubham.B 19-01-21 Savita D21

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VSSC (ISRO) Technician B (Electronic Mechanic) Previous Year Paper (Held on 25 Sept 2016)
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  1. 50 Ω
  2. 4 kΩ
  3. 4.08 kΩ
  4. 5 kΩ

Answer (Detailed Solution Below)

Option 2 : 4 kΩ
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संकल्पना:

F1 S.B Madhu 10.07.20 D2

उपरोक्त दर्शाये गए एक विपरित प्रवर्धक के लिए वोल्टेज लाभ को निम्न द्वारा ज्ञात किया गया है:

Av=VoutVin

आदर्श opamp में काल्पनिक भूयोजन होता है और op-amp में प्रवेश करने वाली धारा 0 होगी। 

इसलिए, opamp के विपरीत टर्मिनल पर KCL लागू करने पर हमें निम्न प्राप्त होता है:

Vin0R1=0VoutRf

VoutVin=RfRi

गणना:

VoutVin=RfRi

Ri = (60 × 10-3 × 200 × 103)/3

Ri = 4 kΩ 

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