Inverting Amplifier Input Impedance. From above we can see that the inverting input is at 0v potential virtual ground so the input impedance is r1. It can convert the current from photodiode accelerometers or other sensors which produce low current and using the trans impedance amplifier the current can be converted into a voltage.
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The amplifier provides low impedance across the photodiode and creates the isolation from the op amp output voltage. Input impedance r1. The general approach to calculate input impedance or output impedance is to inject a small current into the input node di and look at the resulting change in voltage of the input node dv.
Or equivalently to apply a small voltage dv and look at the resulting current di from your test voltage source.
Input impdeance plays a very important role for cases like signal source loading impedance matching while multiple stages are coupled etc. The amplifier provides low impedance across the photodiode and creates the isolation from the op amp output voltage. Input impdeance plays a very important role for cases like signal source loading impedance matching while multiple stages are coupled etc. The general approach to calculate input impedance or output impedance is to inject a small current into the input node di and look at the resulting change in voltage of the input node dv.
