Questions tagged [gain-bandwidth-product]

the product of the amplifier's bandwidth and the gain at which the bandwidth is measured.

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101 views

Op amp advertised as BW = 105MHz, but GBP is actually 70MHz, what's being spec'd differently?

I just came about an op-amp spec where they say, "the Op-amp X is unity-gain stable with a small-signal unity gain bandwidth of 105MHz.." As you continue to read, it then says, "with a ...
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38 views

Cascaded Non Inverting Amplifier

I'm working on a project that requires at least 40 dB gain at 40kHz. I originally used one non-inverting amp using 10k and 1k resistors for a gain of 11. Using cascading rules for linear systems, I ...
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36 views

Did I interpret these multisim results correctly?

From the circuit above, this is what I have to do: " Connect the circuit with R3 equal to 470 kΩ. Set the input frequency to 100 Hz. Adjust the signal level to get an output of 5 Vp-p. Record ...
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1answer
71 views

Opamp: Compensate to achieve constant gain

I have been trying to achieve a constant gain across an LM318 opamp in a differential amplifier configuration ranging from 500Hz to about 500kHz. The opamp has a bandwidth of 15Mhz. Since the gain is ...
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28 views

Opamp: Does the openloop Gain changes depending on the Input stage?

In case for bipolar Input stages on Opamps: does the actucal Openloop gain changes depending on which input stage, n or p channel is used? (which depends on the applied input signal) Could not find ...
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1answer
66 views

Higher cutoff frequency of op-amp circuit is different in simulation and on paper

I have the circuit below: This is an inverting amplifier, the op-amp that is used is 741 as shown in the circuit. Open-loop gain of the op-amp is \$ A_{0}=2\times 10^5 \$ and the cutoff frequency of ...
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2answers
205 views

Bandwidth of pentode amplifier

Why is the bandwidth of pentode amplifier larger than the bandwidth of triode amplifier? I have searched the following books but can't find the answer: Electronics devices and circuits by Rajiv ...
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1answer
92 views

How to amplfy µA from a fast photodiode with a bandwith of 10GHz

I want to measure faint laserpulses with a step slope (Bandwidth 5-10GHz). I have a photodiode which produces a photocurrent of some µA. Now I need a transimpedance amplifier to convert it to at least ...
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26 views

Gain bandwidth product for amplifier

If a question simply asked "What is the gain bandwidth product of this amplifier?" And when I am trying to utilize the equation : GBW = (Av)(BW) I am unsure if I should utilize the voltage gain ...
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79 views

op amp design for bandgap

What values of the main parameters of an op amp are suitable in a bandgap reference design? The purpose is to obtain a smaller temperature drift in the range -40 to 125 C. The model I am using now is ...
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1answer
80 views

What did my professor mean with this: gain-bandwidth product

After trying to ask multiple times my professor what he meant with this I still don't get it. Basically I have an inverting amplifier with a specified gain-bandwidth product of 0.6 MHz. Now as I ...
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1answer
59 views

MATLAB model of an op-amp's Open Loop Gain

I'm using MATLAB to analyze an amplifier in a transimpedance circuit, and I'm a little lost in implementing the op amp's open-loop gain function with the following formula: $$A(s) = A_{OL} \cdot \...
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2answers
292 views

What's the largest practical stable gain possible?

I have a feedback application to set the voltage of a node in which there is considerable loss in the loop. Simulations tell me that a differential voltage gain of 10000, 80dB (roughly about what you ...
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1answer
76 views

Finding a gain bandwidth product using a test frequency

For GBP datasheet parameters of Op-amps, I have seen datasheets with test conditions like gain and Rl, but there are also datasheets with ftest as their conditions. How do we calculate the GBP of the ...
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55 views

CA3140 wideband output amplifier

The following circuit is nearly exactly what I need for the output stage of my function generator: datasheet: https://www.renesas.com/us/en/www/doc/datasheet/ca3140-a.pdf What I don't understand is ...
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5answers
4k views

Understanding of Dominant Pole Compensation

According to Miller Effect, within amplifying devices such as transistors that have inverting voltage gain higher that one, there should be increased input capacitance with increased voltage gain of ...
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2answers
104 views

What does the condition “f=100Hz” mean for the Gain Bandwidth Product?

In the LT6003 datasheet you can find the following information: How do I read the Gain Bandwidth Product? I mean there is a typical bandwidth of 2kHz under the condition of f=100Hz and I'm not sure ...
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41 views

Gain bandwidth product of amplifier in a DC scenario

I think I have a simple (but still to me confusing) question regarding the gain bandwidth product (GBP) of an instrumentation amplifier: Datasheet (AD8237) I have sensors that change their output ...
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2answers
439 views

Why Gain-Bandwidth Product of devices having a simple one-pole frequency response is constant?

I was reading wikipedia page of Gain-Bandwidth Product and got struck at one particular statement. For devices such as operational amplifiers that are designed to have a simple one-pole frequency ...
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2answers
774 views

OpAmp Design Questions for Transimpedance Amplifier

I'm trying to improve on a transimpedance amplifier design by changing out the op-amp that I'm currently using for another one. The issue I'm facing now is that I'm unsure as to how to pick a good op-...
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2answers
131 views

Wrongly documented TI LM324 unity-gain bandwidth?

I was reading the datasheet of the LM324 from TI (http://www.ti.com/lit/ds/symlink/lm324.pdf). They specify a generic GBW of 1.2MHz. This is usually done with no output applied, from what I ...
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190 views

Maximum Gain For Chopper Stabilized Instrumentation Amp (MCP6N11)

I am using a Microchip MCP6N11 chopper stabilized instrumentation amplifier to amplify the signal from a MPX2300DT1 Wheatstone bridge pressure sensor. My schematic is attached. As shown the gain is ...
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1answer
3k views

Gain-bandwidth product proof for open loop/closed loop opamp

On the forum, post #12, Ghar claimed that the proof gain-bandwidth product from wikipedia is awful and he gave another proof but with feedback. https://en.wikipedia.org/wiki/Gain%E2%80%...
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2answers
453 views

gain of opamp circuit with current output

I'm designing a current source using a MOSFET driven by an opamp. The opamp controls the gate by comparing the voltage on a shunt resistor to the input reference. You could say that the fet replaces ...
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4answers
749 views

OPA211 weird frequency response — why?

I'm using an OPA211 in differential mode with unity gain; no external compensation. I'm getting a puzzling ~10MHz bandwidth (specs indicate a bandwidth of 45MHz at G=1) with a peak at 8MHz (consistent ...
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177 views

Influence of NFB on the Gain of Amplifier

NFB is an acronym for negative feedback. Lets say that we have an amplifier with three stages: input (differential) stage followed by voltage amplification stage and output power stage. And we have a ...
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241 views

Finding the frequency of opamp to get a specific voltage gain

In the following question, they ask for the frequency at which the gain would be 1.41 V/V. The dc or low frequency closed loop gain is 2V/V (6 dB). Is the solution of the following question done ...
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1answer
336 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 ...
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4answers
18k views

Bandwidth of inverting and non-inverting op-amps

If the same op-amp is used in both inverting and non-inverting modes (with same closed loop gain using appropriate resistors), will the closed loop bandwidth of the op-amp in both cases be the same? ...
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134 views

Parameters of a current sense amplifier

I am trying to select a current sense amplifier for my design. My design parameters are :- Vrail:- 9V to 21V ILoad :- 20A(max) When I look on digikey, http://www.digikey.com/product-search/en/...
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2answers
1k views

Understanding Op-Amp gain bandwidth product

Below is the schmatics and AC transfer function for transimpedance amplifier from this design. According to the datasheet, OpAmp has the gain bandwidth product of 20MHz. But, here the gain is 94.58 ...