lord loh.
Member
I have read a few books befor I decided to post here.
Virtual Ground:
Most of the OP AMP circuits mention of a virtual ground. I am still not able to figure out what this means...
Some show OPAMPs to have an Ri connected between the inverting and the non inverting terminals(Digital Integrated Electronics - Taub & Schilling). While some have the two terminals grounded via resistors.
What should I consider virtual ground to be?
Feedback:
What I understand by feedback is to have the output supplying current to the input. But all the opamp circuits I have read about have a source connected to the non inverting terminal and a feedback resistor from output to input. and current flowing through this feedback resistor from the input side to the output side. The explaination is that since op-amps draw little current, the current flows to the output side via the feedback resistor.
But if the amplified output is higher than the input, should current not flow from output to the input.
Sorry, I have no diagrammes at the instance. I tried to describe the situation as clearly as possible.
Math Operation :
Are Op-Amp used in digital computers for maths operations? I have been told at college that most maths in the computers like division and multiplication are done by addition and subtraction. Is this done descretely via registers or by op-Amps? And what about complex operations like log, ln, dy/dx, integration, sine, cosine etc.??? Are data tables used?
Thanks in advance.
Virtual Ground:
Most of the OP AMP circuits mention of a virtual ground. I am still not able to figure out what this means...
Some show OPAMPs to have an Ri connected between the inverting and the non inverting terminals(Digital Integrated Electronics - Taub & Schilling). While some have the two terminals grounded via resistors.
What should I consider virtual ground to be?
Feedback:
What I understand by feedback is to have the output supplying current to the input. But all the opamp circuits I have read about have a source connected to the non inverting terminal and a feedback resistor from output to input. and current flowing through this feedback resistor from the input side to the output side. The explaination is that since op-amps draw little current, the current flows to the output side via the feedback resistor.
But if the amplified output is higher than the input, should current not flow from output to the input.
Sorry, I have no diagrammes at the instance. I tried to describe the situation as clearly as possible.
Math Operation :
Are Op-Amp used in digital computers for maths operations? I have been told at college that most maths in the computers like division and multiplication are done by addition and subtraction. Is this done descretely via registers or by op-Amps? And what about complex operations like log, ln, dy/dx, integration, sine, cosine etc.??? Are data tables used?
Thanks in advance.