EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: fonograph on November 29, 2018, 09:30:09 am
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I have two questions,can capacitor coupled amplifier -3db point,I mean how high does the high pass filter cut off,change depending on impedance of the load? And same question,just this time if the amplifier output impedance can change depending on impedance of load.
I dont see how any of this would change,but I am not so sure anymore when its highly complex circuit with bunch of feedback or feedforward loops.I ask becose I read some specifications that gave the capacitor coupled amplifier lower
frequency cut off with added number of impedance of load that was tested with,that made me think,what if this cut off change depending on impedance of load.
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The first question is simple, substitute load for R and calculate for R-C filter.
If load impedance (R) changes with frequency or temperature or..... you have
a lot more points to calculate. :)
Second question, it shouldn't, but there are way to meany variables here to give a use full answer.
Do you have specific application and schematic?
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I dont have anything specific.