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1 vote

### Op Amp Feedback Resistors

Introduction Both non-inverting and inverting op-amp amplifiers use the same voltage divider as a feedback network; only in the former, it is an ordinary 1-input device while in the latter, it is a 2-...
• 18.2k

### Op Amp Feedback Resistors

There are a few considerations. Frequency- at high frequency various capacitances have an effect so you don't generally want to be using MΩ resistors at high frequencies. It could cause poor behavior ...

### Op Amp Feedback Resistors

To a first-order approximation, it's a matter of how much current the op-amp can provide (sets a lower bound on resistance), how much power you can stand to consume (sets a lower bound) how much error ...
• 36.4k
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### Given an active filter or any sort of operational amplifier with finite open loop gain, is feedback factor accounted for in the standard gain formula?

A first-order high-pass transfer function in s-space may be expressed in either one of the following forms: \begin{align*}H_s&=A\cdot\frac{s}{s+\omega_{_0}}\\\\&=A\cdot\frac{\frac{s}{\omega_{...
• 11.8k
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### Understanding GBP, closed loop gain and open loop gain

Since you are given an open loop gain, but not a gain-bandwidth product it's likely that you are supposed to assume that the opamp has infinite bandwidth (what else can you do?). By the way, your ...
• 4,361
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### Transfer function of an operational amplifier with finite open loop gain - did I do this correctly?

Knowing the expression for Acl(s) - as given in your post - it is best to use this formula with finite open-loop gain Aol - together with the feeedback factor, also given in your text. Please note ...
• 27.4k
1 vote
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### If I have an operational amplifier with a finite open loop gain, can I calculate the transfer function neglecting the open loop gain?

It's a bit of a chicken and egg problem. First, you calculate the circuit gain $G$ by assuming an ideal opamp with infinite open loop gain $A_{ol}$, infinite input impedance, etc. Then, you can ...
• 80.3k
1 vote

### If I have an operational amplifier with a finite open loop gain, can I calculate the transfer function neglecting the open loop gain?

Yes, you can assume an ideal opamp which as infinite gain and infinite resistance. In that case V+ is equal to V-. In the real world opamps have finite open loop gain and bandwidth. If you aren't ...
• 87.1k
1 vote
Accepted

### Finding an expression for the transfer function and mid-band gain of a real operational amplifier with a capacitor in its feedback network

The best and fastest way to obtain the transfer function in a clear and ordered form - read low-entropy type of expression - is to resort to the fast analytical circuits techniques or FACTs. You have ...
• 23k

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