/sci/ - Science & Math

Anonymous Mon Jul 13 08:41:09 2020 No.11896761 [View]
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Why is high or even infinite impedance desirable for voltage-controlled devices like op-amps and FETs? I understand it reduces power consumption, but how can voltage be amplified across a high impedance? Wouldn't that just result in a voltage drop?

Anonymous Tue Jun 30 19:01:22 2020 No.11855066 [View]
File: 9 KB, 434x210, Sine wave.gif [View same] [iqdb] [saucenao] [google]

Why is infinite impedance desirable? Even for voltage-operated devices like FETs and Op-Amps, why is it a good thing? Both voltage and current drop across resistors, so then how can you amplify voltage with infinite or high impedance? Wouldn't it just cuck the voltage value?

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