निम्नलिखित विभेदी युग्म (VT = 25mV और β = 100 के लिए) की निवेश प्रतिबाधा कितनी होगी?

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
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  1. लगभग 2 kΩ
  2. लगभग  20 kΩ
  3. लगभग 2 MΩ
  4. लगभग 200 Ω

Answer (Detailed Solution Below)

Option 1 : लगभग 2 kΩ
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Detailed Solution

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संकल्पना:

अवकलन प्रवर्धकों की इनपुट प्रतिबाधा को निम्न के द्वारा दिया गया है;

Zi = 2βre

जहाँ;

re = VT/IE

गणना:

दिया गया है;

VT = 25 mV

β = 100

IE1 = IE2 = IE = 5/2 = 2.5 mA

re1 = re2 = re =  VT/IE = 25/2.5 = 10 Ω 

तब;

Zi = 2βre = 2 × 100 × 10 = 2000 Ω = 2 KΩ 

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