# Questions tagged [loop-gain]

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109 views

### How to measure amplifier circuit loop gain

In the last few days I've tried to understand how to get the loop gain (Aol*ß) of my amplifier circuit. I've received several suggestion. I would like to hear your opinion on this matter. Are these 2 ...
95 views

### Negative loop gain?

I was dimensioning the CE capacitor. To do that I was looking at some formulas seen in class. The formula (freq_C=1/(2*piReqC)) involves the knowledge of the loop gain (open loop gain*beta). It ...
37 views

### Calculating the loop gain for an ideal op-amp with time delay

In the circuit below, $\tau$ represents a time delay. We are using a first-order Pade approximation for this time delay. This means that $\ e^{-s\tau} = (1-s\tau)/(1+s\tau)$. Below is the ...
33 views

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
972 views

### Finding Loop Gain (Aβ) of Transimpedance Amplifier

I have been having trouble finding the loop gain (Aβ) of the following transimpedance amplifier: simulate this circuit – Schematic created using CircuitLab To find Aβ, the books I have looked ...
849 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 ...
539 views

### Stability of closed-loop systems at -180 degree frequency

Say e(t) is sine wave and y(t) is sine output. If y(t) has the same frequency as e(t) with phase shift of 180 degrees, we can only get stability of the system, if the gain of open loop at this ...
181 views

### 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 ...
125 views

### Linear Oscillator Frequency Problem

I was doing one of the problem sets when I stumbled upon this gem. I know that for oscillation to occur, the gain has to be greater than 1. The loop gain I computed is Could anyone suggest any ...
175 views

### Closed-loop gain with source degenerated amplifier

The following circuit needs is modeled with parasitic capacitances to be analysed in frequency. I need to drive it with an MCU that can output a signal that can be some tens of kHz and I need to see ...
464 views

### Facing to real world feedback designs (here, Constant Current Generator)

I still work on a current generator made with 2 opamps and a nMOS. If I find the bias point to understand how much my LED can be driven, I still have problems to find an affordable way to derive the ...