# Questions tagged [loop-gain]

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### Loop bandwith and open-, closed- loop gain in ADIsimPLL

I'm want to use ADIsimPll to calculate the loop filter properties for a PLL I want to build. I read some things in the programs help topics which I find somehow strange. Maybe you guys can help me out ...
240 views

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### How do I calculate closed loop gain's deviation?

I have an exercise in my book that I am trying to solve: How large must the magnitude of the loop gain, $|A \beta|$ be in order for the closed loop gain, $A_t$, to deviate less than 0.1% ...
290 views

### Gain-Bandwidth of LTC6409

I am planning to use a differential amplifier, LTC6409 which is reported to have a GBW of 10GHz. I ran an AC analysis on LTSpice using the Spice model given here. I connected the negative input to ...
724 views

### A question about loop gain, feedback and stability of an op amp circuit

I read this article on the feedback and stability concept of an op amp. The article describes the relationship between open loop gain, closed loop gain, loop gain and some oscillation effects for the ...
311 views

### How to stabilize this op-amp/MOSFET control system

I am creating a constant-current source and am having troubles stabilizing the control loop around U3, this is the circuit: This next picture represents the plot of loop-gain of U3: I've tried ...
420 views

### Understanding the negative feedback and stablizing of a current limiter

Here's a current limiter circuit that uses the negative feedback to limit the current to a certain point. simulate this circuit – Schematic created using CircuitLab I have not studied ...
166 views

### Open loop gain of non-inverting amplifier

How can I find open loop gain of this non inverting amplifier. I searched for answer but couldn't find the answer. Using formula Gain=1+R2/R1 I am not able to figure out values ofR2 and R1
126 views

### Big loop gain vs. big bandwidth

If one was looking for an audio amplifier of high quality, with very low distortion, which one of these two options would be better? Large loop gain (i.e. $af$) but small open loop bandwidth Small ...
879 views

### Measuring Open Loop Gain

I have a question about open loop gain. In the circuit below, I want to measure the open loop gain of the error op-amp. I'm curious if the Current Limiting op-amp will affect my gain. What does it ...
519 views

### Positive feedback with constant transfer functions

If I have a control loop with positive feedback, the closed loop transfer function expression is: $$\frac{Y(s)}{X(s)} = \frac{P(s)}{1-P(s)H(s)}$$ where $P(s)$ is the direct loop transfer function ...
115 views

### Closed and Open Loop gain

Please Could you help me to solve this question I foud hard time for it These what I got You will find the answer in Page# 1 and Page# 2
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### Where is the pole introduced by the RC circuit?

I've implemented a circuit under a suggestion which solves stability issues when driving a MOSFET with an high capacitance, using an OpAmp. Now, the circuit suggested is this one, in which is modeled ...