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Avg rating: 80
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suresh
- input impedance of op-amp
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2009-01-08 |
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Please tell me how to measure the input impedane of an op-amp
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Moe
- Re: input impedance of op-amp
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(no rating)
2009-01-09 |
This app note talks a little about it but for more detail, search the web -- there are some good articles. Start with this: http://tinyurl.com/7nrvae
- Moe Rubenzahl, Maxim
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Arpit
- Re: input impedance of op-amp
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(no rating)
2009-01-09 |
If you are feeding your signal at non-inv terminal (opamp configured in non-inv configuration), the input impedance would be very large(limited only by the bias current of non-inv terminal). If your signal is fed at inv terminal (Inverting configuration), the input imp then would be R1(gain setting resistor between signal and inv terminal)since the inv terminal is sitting at virtual ground.
In differential configuration, the input imp would be sum of R1 and R1=2R1 (since V1- potential would be same as V and hence virtually shorted).
- Arpit M. (Maxim)
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