# Tagged Questions

37 views

### An amplifier with feedback [on hold]

I have some problems with this circuitry. I should find Uout/Es, lower frequency limit, upper frequency limit and Re, when Uout=Up/2. Thank you for all possible information.
44 views

### How to identify the feedback topologies?

It is extremely important to identify the feedback topology first before starting analysis. However, I find it difficult and cannot get it right. Is there an accurate yet easy way for me to identify ...
80 views

### Advice for my Voltage controlled Amplifier

In class we are designing a VCA together as part of a bigger circuit. The aim is that we have an input of speech and an input of music and when we speak the the music reduces in volume. The speech ...
66 views

### Unity-gain closed loop Miller OPAMP fails to follow the input after a few microseconds?

I implemented a Miller OPAMP. After I have checked it reaches the desired gain and swing, I put it into the simplest form of closed loop with UNITY negative feedback. The schematic is as follows: ...
109 views

### I don't understand how the resistor between GND and the source in a common-source amplifier stabilizes it

See this circuit: Applying KVL around the gate-source-GND-gate loop, I get Id = (Vg - Vgs)/Rs. I know the typical argument begins with, if Id increases then Vs increases, but I am not sure of how ...
129 views

### Confusion in feedback for switchmode dc/dc converter

I have a slight confusion in how the feedback pin works. The "$V_{ref} \times (1 + R_1 / R_2)$" seems like a shortcut to me, and I have trouble understanding how to feed a voltage in to it, to say ...
442 views

### Is feedback transfer function the same as the transfer function for the whole circuit?

I have a circuit very similar to the inverting band pass filter circuit here: I was asked a question about the circuit's feedback transfer function. Is this the same as the transfer function for the ...
479 views

### Why can't a feedback network use a capacitor? [duplicate]

Possible Duplicate: Basic Frequency Control Circuit In the following schematic, why can't R4 be taken away and the feedback network pass output feedback through C2 and R2?
6k views

### Why is feedback required in op-amp circuits?

I understand that, in order for an op-amp to function correctly, a DC feedback loop from the output to either the inverting or the non-inverting input (depending on the external circuitry) is ...