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# Posts tagged feedback

Subtag of circuit-theory

Anything about feedback theory and applications in electrical engineering.

Feedback refers to a series of techniques where a fraction of an output signal is "fed-back" to the input of a system (i.e. added to the input), possibly through a signal conditioning circuit. This allows to modify the system response to the input signal, obtaining some useful effects.

For example, negative feedback can improve an amplifier linearity and dynamic range, and can make its characteristics less sensitive to active components parameters tolerance.

Positive feedback, on the other hand, can transform an amplifier into an oscillator, which is a useful effect if you are designing an oscillator. However, it is a problem if the feedback is not intentional and your nice amplifier becomes a screaming noise generator.

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I’d like to create a stable IR LED light source. I’ve read that LED efficiency changes with temperature. I’ve seen two designs which used feedback through light to correct the LED temperature dri...

1 answer  ·  posted 1mo ago by misk94555‭  ·  edited 22d ago by misk94555‭

Question feedback LED-driver
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This application note from Linear Technology discusses oscillations in opamp circuits and some compensation schemes. One method discussed for reducing phase shifts in the loop gain due to the RC ne...

1 answer  ·  posted 3y ago by rpm_2718‭  ·  edited 9mo ago by Lorenzo Donati‭

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The thermal stability coefficient is defined to be: $S = \frac{dI_{C}}{dI_{CBO}}$ where $I_{CBO}$ is the reverse current of the BJT when voltage isnt applied to the base of the BJT. In case of a ...

0 answers  ·  posted 1y ago by MissMulan‭  ·  closed 9mo ago by Nick Alexeev‭

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I am trying to find the AC analysis of a BJT Hartley oscillator but I cannot continue. How do I find the voltage gain? When no feedback is there, we just find the output resistance and the current...

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

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I have this circuit: I think that R3 acts like a feedback path from the output to the input.However I am not sure what will happen if I change the value from 100Ohms to lets say 1kOhms. I have ...

2 answers  ·  posted 2y ago by MissMulan‭  ·  last activity 2y ago by LvW‭