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posted by  cberns21 on 11/15/2009 5:59:38 PM  |  status: Closed  |  Earned Karma: 32

Op-Amps

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Analog Circuits N/A N/A N/A 11/15/2009 at 9:00:00 PM
Question Details:
Design an Op-Amp circuit with a gain of -2000, where Rin >250kΩ. Use resistors in the range of 1kΩ - 100kΩ. I understand how to do it, but the way I am trying to do it I will have to use a lot of resistors. If some one can answer this for me I will rate lifesaver.
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posted by Shree_vani(MNK) on 11/15/2009 8:43:53 PM  |  status: Live
Asker's Rating: Lifesaver   
Response Details:
You can use multistage amplifier

The input resistance of the circuit is 300kΩ
The gain of 1st stage is
A1 =- 300k/300k = -1
(Use three 100k resistors in series to get 300k)
The gain of second stage is
A2 = -200k / 1k = -200
The gain of third stage is
A3 = -10k/1k = -10
The overall gain of the circuit is
A = A1 * A2 * A2
A = (-1)(-200)(-10)
A = - 2000
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