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Q&A

Posts tagged amplifier

Synonyms: amplifiers

2 child tags

Anything related to amplifiers, i.e. devices used to increase the amplitude or the power of signals.

This tag doesn't have a detailed wiki yet.

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Q&A What is the role of the differential amplifier in a delta sigma converter?

A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. Based on this scheme the differential amplifier is substrac...

1 answer  ·  posted 3y ago by Pacifist‭  ·  edited 8mo ago by Lorenzo Donati‭

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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 sh...

4 answers  ·  posted 3y ago by jm567‭  ·  edited 8mo ago by Lorenzo Donati‭

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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 3y ago by Pacifist‭  ·  edited 8mo ago by Lorenzo Donati‭

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Q&A Testing instrumentation amplifier with differential signal

I am using the AD620 as instrumentation amplifier to amplify the body's ECG signal. An ECG is a differential signal (measured with two electrodes) and I want a differential gain of Gd=1000 . The ...

3 answers  ·  posted 1y ago by Carl‭  ·  last activity 1y ago by TonyStewart‭

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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 1y ago by MissMulan‭  ·  closed 1y ago by Olin Lathrop‭

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Q&A Help with differential to single ended voltage converter

Hello I don't understand how this differential to single-ended voltage converter can work. What I don't understand is why we place a current mirror(a current mirror copies the current flowing thr...

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

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Q&A MOSFET differential to single ended converter intuition

How does the differential to single ended converter work? In order for the circuit to work, Q1 and Q3 must be in the saturation region and depending on the voltage inputs, one of Q2 and Q4 will be...

1 answer  ·  posted 2y ago by MissMulan‭  ·  edited 2y ago by Peter Mortensen‭

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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 3y ago by coquelicot‭  ·  edited 3y ago by coquelicot‭

Question IC amplifier
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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 3y ago by LvW‭  ·  edited 3y ago by LvW‭

Question amplifier
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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 3y ago by jm567‭  ·  last activity 3y ago by Circuit fantasist‭

Question bypass amplifier
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Q&A What benefit has a differential amplifier when measuring a sensor signal?

What benefit has a differential amplifier when measuring the signal from a sensor that is remotely located such as in this example: - Why can't I use an arrangement like this: -

1 answer  ·  posted 3y ago by Andy aka‭  ·  last activity 3y ago by Andy aka‭