How to Calculate the Complex Op Amp in Circuit Diagram

[umair1998]

TL;DR Summary: How to calculate the operational amplifiers in the circuit diagram

Hello Everyone,
I am trying to learn the circuit diagram of one of a device in which I will be doing modifications as a part of my Masters's Research to make it performance better. My background is in Mechanical Engineering and I am looking for a consultation about how to solve this kind of complex Op Amp circuit.
Please help me in this regards.

Secondly I want to know what will be the effect of resistors and capacitors on output signals if I increase or decrease the resistor or capacitor values? In short I want to know function of resistors and capacitors in Op Amp and electronics pcb circuits.

You help will be appreciated Thanks

 

[Baluncore]

Welcome to PF.

Both those circuits are differential amplifiers, but they are drawn to make it difficult to recognise, and the circuits have asymmetric gain, 12/3 ≠ 3/2.

Where do those circuits come from?
Who put the values on the components?

 

[berkeman]

Thread closed temporarily for Moderation...

 

[berkeman]

Thread reopened for now (after moving it to the schoolwork forums).

I am looking for a consultation about how to solve this kind of complex Op Amp circuit.
Please help me in this regards.

Secondly I want to know what will be the effect of resistors and capacitors on output signals if I increase or decrease the resistor or capacitor values? In short I want to know function of resistors and capacitors in Op Amp and electronics pcb circuits.

This seems like a strange assignment or project for you. You have no circuit design background, but are being asked to understand and optimize these opamp circuits? They are pretty simple, but as Baluncore says, they are drawn awkardly.

Can you say more on what your background is so far in circuit analysis and design? And please explain more about how you were assigned the EE part of this project if you have no EE background yet? Thank you.

 

[umair1998]

Thread reopened for now (after moving it to the schoolwork forums).This seems like a strange assignment or project for you. You have no circuit design background, but are being asked to understand and optimize these opamp circuits? They are pretty simple, but as Baluncore says, they are drawn awkardly.

Can you say more on what your background is so far in circuit analysis and design? And please explain more about how you were assigned the EE part of this project if you have no EE background yet? Thank you.

Hi Berkeman,
My bachelor's is in mechanical engineering and for my master's, I came abroad, my supervisor's lab is working on mechatronics projects due to this current project modification is in progress, and the professor involves me in it, Professor right now giving me time to learn about electronics and LabVIEW, actually, AFM is a device used to measure the height of mems and other nanodevices, the issue is that microprocessor sometimes doesn't work and when it is working response delay is a lot, so my professor wants to replace the microprocessor of that driver unit with LabVIEW code, almost all code is already built but I want to know the functions of the components on op amp so that I could modify them to reduce noise and get a response faster.

 

[umair1998]

Welcome to PF.

Both those circuits are differential amplifiers, but they are drawn to make it difficult to recognise, and the circuits have asymmetric gain, 12/3 ≠ 3/2.

Where do those circuits come from?
Who put the values on the components?

Which of the component help to reduce the noise of the signal? In QPD (Quadrant Photodiode) a lot of complex op-amp are used with resistors and capacitors, QPD purpose is to give us the out put of height/distance by reflecting the laser light back, so how I will make the signal better which shouldn't have noise and if I want the gain larger which component value should I change?

 

[hutchphd]

If you are amplifying a photodiode, why is it not shown?
What is the required speed (i.e. bandwidth) to make a good signal?

 

[DaveE]

OK, so, are you getting a Master's degree in ME and don't care about Mechatronics (note the "tronics" component)? Then this is a reasonable question. A very basic 1st (undergraduate) year question. In which case you'll need to study a bit outside of your desired field and learn how to analyze these simple circuits yourself. I'm not convinced just telling you the answer (which we've already done) is really very helpful. If you do care about the "tronics" part, you are way behind graduate level and really should talk to your advisor and get advice about this.

Graduate work requires research and independent learning. This would be a good problem to start with. OTOH, if you ask a very specific question, I'm sure you'll get an answer from us, but I'm not sure it will actually help you much in the long run.

Honestly, there are too many introductory op-amp web pages to choose one to refer you to, but here are a couple:
https://www.electronics-tutorials.ws/opamp/opamp_8.html
https://www.ti.com/lit/an/sboa092b/sboa092b.pdf

Reducing noise in amplifier circuits is much more difficult than this basic function question. A good place to start would be Sergio Franco's Op-Amp book. It is both good (accurate and appropriate) and easy to read and use.

 

[berkeman]

so how I will make the signal better which shouldn't have noise

Do a search on synchronous modulation/demodulation.