Hi, is it possible for me to redesign this circuit using only the the op-amp I have attached. I was told to make an amplifier circuit preferably with the op-amp available rather than ordering new ones. The link has a circuit that fits the purpose perfectly, so I was wondering if I could just adjust this circuit somehow using the op-amps I have available. https://www.researchgate.net/figure...-Piezoceramic-disc-transducers_fig9_283127271
The only thing I have available at school is the OPA380/OPA2380.

 

Why bother with understanding the opamp you have. Just hack away and see what happens. Nobody is going to get fired and you did what you were told. That's a good Dobby.

 

The opa380 is not a "normal" opamp, so you cannot just drop it into a previous design intended for other parts.

What is the circuit supposed to do? If it is an amplifier, what is the required gain and frequency range?

ak

 

The original question was "is it possible". Yes, it might be possible, but probably not with the same or better performance. Just because it is possible, doesn't necessarily mean it is a good idea. AK has already hinted at the OPA380 not being a "normal opamp. You also would have to take a look at the AD797 to see if it was "normal" or something else. The LM318 is a wide bandwidth, high slew rate part requiring considerable care in design and layout to avoid instability problems.

 

The link has a circuit that fits the purpose perfectly, so I was wondering if I could just adjust this circuit somehow using the op-amps I have available. https://www.researchgate.net/figure...-Piezoceramic-disc-transducers_fig9_283127271
The only thing I have available at school is the OPA380/OPA2380.

In addition to the issues that have already been mentioned, note that the power supply operating voltage range of the OPA380 is only 2.7V to 5.5V, whereas the AD797 is designed to operate on supply voltages up to +/- 15V.

The circuit in the above link does not specify the power supply voltage used, but it is almost certainly a bi-polar supply of at least +/- 5V (since the output signal is described as +/- 5V). To operate the OPA380 in this circuit, the supply voltage will have to be restricted to +/- 2.5 volts maximum, with a corresponding reduction in output signal amplitude.

 

Hi, is it possible for me to redesign this circuit using only the the op-amp I have attached. I was told to make an amplifier circuit preferably with the op-amp available rather than ordering new ones. The link has a circuit that fits the purpose perfectly, so I was wondering if I could just adjust this circuit somehow using the op-amps I have available. https://www.researchgate.net/figure...-Piezoceramic-disc-transducers_fig9_283127271
The only thing I have available at school is the OPA380/OPA2380.

Hi,

Whenever you go to replace one part with a different part the thing to do is compare specifications. You hope they are as close to each other as possible, but if they arent, then you have to analyze the circuit to determine the critical operating points and once you figure that out you can go on to figure out how a less than optimum op amp will work in that application.
For example, if your original op amp has +50uv input offset then with a gain of 100 your output will be offset by 5mv, but if you replace it with an op amp with 5mv input offset then with same gain of 100 the output will be offset by 0.5 volts. That's 100 times higher than with the original.
Now you have to place that into the application and decide if that 0.5v is going to mess up the whole idea of doing the circuit in the first place. If it does then you're in trouble, but if it doesnt then you're good to go.
However, that being said if you only have a certain op amp available then you are screwed if it doesnt work but good to go if it does. You can assess the possible errors and make that part of your report showing what there is a lot more error than there should be and why.

What else you could do is read the article in full and see if you can spot any operating points that could be important. For example for this kind of application i would say low noise is a requirement for any op amp being used as well as proper bandwidth and slew rate.

 

As others have noted, the OPA380 is not a normal op-amp but a transimpedance amplifier (current to voltage converter) intended for use with current transducers such as a photo-diode where the diode current is proportional to the incident light. While it may be possible to interface your transducer to the OPA380, you would need to examine the performance with a signals analysis, bandwidth analysis, and noise analysis. The following article should be interesting:

What's All This Transimpedance Amplifier Stuff, Anyhow? | Bob Pease | Jan 08, 2001

https://www.electronicdesign.com/analog/whats-all-transimpedance-amplifier-stuff-anyhow-part-1

 

Which circuit do you want to redesign using the specified opamp?