Transistor BJT frequency response .?
Assuming you have a BJT that has a Coupling and bypass capacitors. what would the equivalent circuit be in high frequency , mid-band range , and low frequency.
From what i understand , in high you short bypass and coupling , in low you open them? i'm not sure , please explain thanks
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Suppose a simple BJT AF amplifier stage contains one 10uF coupling capacitor and one 10uF bypass capacitor at its emitter. As signal source.....
At high AF frequency from 5000Hz to 15000Hz, 10uF almost 100% allows them passing through.That also means it has the highest gain.
At middle AF frequency from 400Hz to 3000Hz, 10uF allows about 70% signal passing through because Xc increase.
At low AF frequency from 20Hz to 200Hz, 10uF allows less than 30% signal passing through,because Xc becomes quite large.That also means this stage has the lowest gain at those low frequencies.