That=B4s called a gyrator.

http://en.wikipedia.org/wiki/Gyrator

2007/2/6, Luis Moreira <Luis.Moreira@jet.uk>:
>
> Hi Guys,
> I have a control loop that has what the manufacturer calls a load
> emulator, which is a combination of resistors and capacitors across the
> feedback path of an op-amp. This is used on the first 5 uS after
> switching as the feedback from the sensor measuring the current on the
> load is to noisy.
> The manufacturer claims that the modelling of the load with a certain
> resistance and inductance in series can be done by using a circuit with
> a certain resistance and capacitance in parallel and a circuit with a
> certain resistance and inductance in parallel can be done by using a
> circuit with a certain resistance and capacitance in series, is this
> correct?
> Best regards
>                 Luis
>
>
>
>
>
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