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Q&A

Posts tagged amplifier

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Q&A BJT common emitter amplifier equivalent circuit (π hybrid model) [closed]

Im studying the equivalent model of a BJT common emitter amplifier at high frequencies.At university we tought that the BJT at high frequencies looks something like this: However when designing ...

0 answers  ·  posted 3mo ago by MissMulan‭  ·  closed 3mo ago by Olin Lathrop‭

30%
+1 −5
Q&A Is this AD8307 fake?

I am trying to test a AD8307. Here are my connections: (pins not shown are left unconnected, and also pin 8). I get a quiescent output voltage at pin 4 of about 850 mV with respect to ground, w...

1 answer  ·  posted 2y ago by coquelicot‭  ·  edited 2y ago by coquelicot‭

Question IC amplifier
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+1 −0
Q&A What is the difference between differential amplifier and differentiator?

Since am interested in how a delta sigma modulator works, I need to know what is the difference between differential amplifier and differentiator if there is a difference of course.

3 answers  ·  posted 2y ago by Pacifist‭  ·  last activity 2y ago by Circuit fantasist‭

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Q&A Usage of modern active building blocks [closed]

In the past, a large number of new active building blocks have been proposed and published by many researchers all over the world. In most cases, these new building blocks were used for realizing n...

0 answers  ·  posted 2y ago by LvW‭  ·  edited 2y ago by LvW‭

Question amplifier
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Q&A Purpose of emitter resistor in a common collector amplifier

I see a lot of common collector amplifiers with the output taken across an emitter resistor. What is the purpose of doing it this way instead of connecting your load directly to the emitter? I shou...

4 answers  ·  posted 2y ago by jm567‭  ·  last activity 2y ago by LvW‭

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Q&A Emitter Bypass Capacitor in a CE Amplifier

How exactly is the emitter capacitor C3 helping to increase the voltage gain in the common emitter amplifier below? Is it because for AC signals the emitter looks like a short to ground and that es...

2 answers  ·  posted 2y ago by jm567‭  ·  last activity 2y ago by Circuit fantasist‭

Question bypass amplifier

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