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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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Sensitive Transimpedance Amplifier frequency bandwidth [closed]

I've built the transimpedance amplifier based on this project Sensitive Transimpedance Amplifier Oscillates. I've used op amp LMC6001, symmetrically power 5 volts, feedback resistor Rf = 100MΩ, ...
Paweł Chmolewski's user avatar
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MDAC AC reference input

I previously had a question on using AC reference voltage with a MDAC, But it has been addressed nicely in the answer below. How does the "Multiplying Bandwidth" specification relate to a ...
Chetan Karkera's user avatar
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I'm trying to design a CE BJT amplifier with 260 gain and Bandwidth of 5.5Mhz

I'm struggling to design a common-emitter BJT amplifier for my college project. for this i selected a BC547 transistor and I have done the calculations by Assuming my Vcc as 12V. then I took Vce = 5V ...
Janitha Karunarathna's user avatar
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Generate a fast, high amplitude pulse for measuring slew rate

I need to create a test set-up that measures slew rate of a few op-amps. The fastest slew rate among all of the op-amps in my list, belongs to NE5532 with 9 V/us slew rate and output amplitude of ±10 ...
Fateme's user avatar
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OpAmp on Multisim keep amplifying over Gain Bandwidth Product

I have below circuit on Multisim with Current source replicating Photodiode and opAmp amplify current. However opAmp keep amplifying even at very high frequencies without considering Gain Bandwidth ...
LifeIsBeatiful's user avatar
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Superimposing AC signal and DC signal

I am trying to add a sinusoidal signal to the positive and negative rails of an op-amp under test, and change the frequency and amplitude of this sine wave to test the CMRR and PSRR. I need to ...
Fateme's user avatar
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op-amp bias current measurement

I am trying to measure the offset voltage and bias current using the technique below (Figure 2 and Figure 3) op-amp servo-loop My question is: can I use NJM4580 as the op-amp under test and use the op-...
Fateme's user avatar
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How does the "Multiplying Bandwidth" specification relate to a DAC output's maximum bandwidth

I'm struggling to understand what it means for a DAC to have a Multiplying Bandwidth of 200kHz. Does it mean that the max frequency component in the DAC's output cannot exceed 200kHz for reliable ...
Ninja Ron's user avatar
3 votes
3 answers
491 views

Transit vs Unity Gain Frequency of a MOSFET

As far as I understand, the unity gain frequency of a transistor is its gain-bandwidth product, and the transit frequency of a transistor is a measure of how fast it is. I've also read that the ...
user_9's user avatar
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Opamp GBW is not matching with measurement

I have circuit below on breadboard with LF351N op-amp in transimpedance mode with feedback resistor of 10 kohm and 10 pF capacitor attached in parallel. In datasheet of LF351N (Datasheet) it is ...
LifeIsBeatiful's user avatar
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Ways to get around amplification limited by op amp GBW?

I'm working on a project that requires me to amplify 70 pA to read out at 10 V (the digitizer I'm using to collect data has a range of 0 to 10 V readout). On top of this, I need to sample my voltage ...
Winston Wilhere's user avatar
1 vote
2 answers
238 views

Effect of GBW and slew rate for "small signal"

I would like to better understand how to choose an op amp for high speed application and more precisely I would like to better understand how the GBW and the slew rate influence the transient response/...
Jess's user avatar
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4 votes
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Slew rate, bandwidth and settling time

I have a system which has to be as fast as possible. The system has to sense a current across a shunt. My first idea as I have no experience on this subject would be to take a "current sense ...
Jess's user avatar
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How does the GBW of an op-amp affect the position of the passband cut-off frequency in a low-pass filter?

Let's say I have a 2nd order low-pass filter in a Sallen-Key configuration (Chebyshev), and the cutoff frequency should be the frequency at which the phase shift becomes -90°, how will the GBW (gain ...
BonPi's user avatar
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What chip has gain of 1000, bandwidth of 500 kHz? [closed]

I'm building a project that needs gain of 1000 (from mV) and bandwidth of 500 kHz. Is there an op-amp (or other parts) with this characteristic? Or maybe it is available in only very expensive parts (...
Jtl's user avatar
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Op-amp simulation

I am not sure what's the mistake I am making in the below simulation. Below is an MCP660 non-inverting op-amp with a gain of 3. Case1: Input: 1 MHz; Offset: 0.5 V; Pk-pk amplitude: 0.2 V Result: The ...
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Lux meter 50 Hz sine noise filter

I've built the circuit with diagram: I used R1 10 MΩ instead of 50 kΩ to get a higher gain. I wanted to measure light intensity, so I'm interested in DC output ...
Malum Wolfram's user avatar
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337 views

Two stage operation amplifier using MOSFET: How to increase the cut off frequency

so I'm trying to design a two stage MOSFET op amp and I'm required to get a gain bandwidth of more than 260Ghz. I'm biasing the first stage with Vb1 around 2.1 V, 1.9 for 2 and 2V for Vb3. With Vdd =3....
Rakan Alamri's user avatar
1 vote
1 answer
229 views

Stable 94 dB gain op-amp amplifier

I would appreciate suggestions or best practices for designing a stable amplifier. My goal is to design a 94 dB gain low-noise op-amp amplifier for a 100 kHz signal with a bandwidth of 10kHz. At this ...
Erzeo's user avatar
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3 answers
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Design methodology for non-inverting summing op-amp

I'm trying to design an op-amp circuit to sum up four voltages by using a non-inverting summing configuration. You can see it in the circuit below, though for illustration's sake, the resistor values ...
BestQualityVacuum's user avatar
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What is the upper frequency limit for an op-amp integrator?

I'm designing a circuit to process a di/dt signal. As the input is the differential of the measured current, I have to integrate the voltage to provide a representation of the current. The duration of ...
Sylvia's user avatar
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Input Source Capacitance Value for GBW Calculation

For the calculation of GBW product for a photodiode: Which diode capacitance value do I use for the input source capacitance (Cs)? I am having trouble understanding the difference between the 400pF ...
Kevin's user avatar
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Building a band-pass filter using an op-amp

I am quite new to op-amps but have looked at them in college and have done my own research on them. I am trying to use an op-amp to build a simple band-pass filter which has an in-band voltage gain of ...
user291514's user avatar
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Why is the noise gain these opamps 500? I feel it should be 250

I wanted to check the bandwidth of the first stage of an instrumentation amplifier configuration and this is the circuit: Since, the noise gain of an opamp is (1+Rf/R1), for each of the op-amps the ...
needbrainscratched's user avatar
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4 answers
1k views

Is -3dB bandwidth defined for any type of transfer function?

If I have response like the following, is it still valid to say bandwidth of the circuit is 2.31kHz?
needbrainscratched's user avatar
1 vote
1 answer
180 views

How much gain/bandwidth can I practically get out of the OPA1692?

I've built an Electret Microphone preamp based on this application note from the OPA1692 datasheet (page 27): The circuit seems to work fantastic, but I've realized that I'd ideally need a bit more ...
theIpatix's user avatar
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2 answers
260 views

Constancy of gain bandwidth product for amplifiers

I've seen the assumption of gain-bandwidth product being constant for some amplifiers. More specifically for a compensated op-amp. Is there any mathematical proof to establish why the product is ...
Curiosity's user avatar
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Calculating the cut-off frequency

I have an inverter opamp with the next data : \$A=-25\$ \$A_{ol}=20\frac{mV}{V}\$ Unity Gain Bandwith\$=10^{6}\$ Then asks for the cutt off frequency, so the open loop its passed to db \$20\,\frac{V}...
avelardo's user avatar
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Constant Gain-Bandwidth product in amplifiers

Can somebody explain to me how the gain-bandwidth product is constant in an amplifier or op-amp? I want to know the mathematical expression behind it if possible. As said here: https://en.wikipedia....
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Why do 2 different online active filter calculators give way different GBW requirements for the same frequency range?

I am confused about 2 different online active filter calculators giving different GBW requirements for the same frequency range. One calculator is giving GBW requirements in the kHz range while the ...
Michael Weaser's user avatar
1 vote
1 answer
217 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 ...
jrive's user avatar
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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 ...
Aaron's user avatar
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1 answer
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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 ...
Rose's user avatar
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3 votes
1 answer
114 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 ...
namezero's user avatar
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1 answer
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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 ...
Ali Nategh's user avatar
2 votes
2 answers
355 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 ...
Dheeraj Choudhary's user avatar
1 vote
1 answer
134 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 ...
barium borat's user avatar
1 vote
0 answers
130 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 ...
Sittin Hawk's user avatar
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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 ...
electricalEN's user avatar
1 vote
1 answer
186 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 ...
Granger Obliviate's user avatar
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1 answer
243 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 \...
BestQualityVacuum's user avatar
1 vote
1 answer
310 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 ...
Emaro's user avatar
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3 votes
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323 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 ...
pr871's user avatar
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5 votes
2 answers
991 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 ...
Edgar Brown's user avatar
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3 votes
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237 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 ...
someonr's user avatar
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1 vote
0 answers
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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 ...
H123321's user avatar
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2 answers
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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 ...
abhiarora's user avatar
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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 ...
thexeno's user avatar
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3 votes
0 answers
283 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 ...
user6342345's user avatar
1 vote
2 answers
928 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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