# 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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### 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....
1 vote
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### 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 ...
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### Design Methodology for Non-Inverting Summing 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 ...
170 views

### 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 ...
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49 views

### 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 ...
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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 ...
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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 ...
873 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?
93 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 ...
67 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 ...
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1 vote
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1 vote
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### 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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108 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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### 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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### 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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1 vote
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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 ...
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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 ...
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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 ...
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### 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 ...
1 vote
706 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 ...
• 856
801 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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6k 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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1 vote
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### 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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1k 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-...
271 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 ...
426 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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### 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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### 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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### 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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