Im a electrical tech student.. and I have a multiple choice question, which I can't find any answers too, after searching the net several op-amp books in a local library...
If the Rf of a Non-inverting op-amp is shorted the output waveform would be...
Zero,
Clipped,
have the same shape and amp. as the input waveform
or smaller in amp. that the input waveform.
Im guessing have the same shape and amp.. any thoughts?
2006-09-12 14:41:52 · 5 answers · asked by Jonathan W 1 in Science & Mathematics ➔ Engineering
This is going by memory, so it may be unreliable. In a non-inverting op-amp, you have the input signal going to the inverting input, but the feedback circuit is a resistor from the output to the non-inverting input (Rf) and another resistor from the non-inverting input to ground. So if you put one volt in to the inverting input, a positive voltage will appear on the output to bring the non-inverting input up to that one volt level. If Rf is zero, you have a unity gain amplifier ... same shape and amp.
2006-09-12 15:11:07 · answer #1 · answered by Anonymous · 0⤊ 0⤋
An Op Amp is an operational Amplifier. It is a circuit consisting of a number of transistors, diodes, capacitors and resistors. The typical Op Amp has two inputs and a single output. Additional wiring consists of the power leads, one negative and one positive (Op Amps run on DC current). The electrical engineering schematic of an Op Amp is a triangle. The two inputs are at the base and the output is at the apex. The power leads typically run out of the sides. Just about all modern Op Amps are integrated circuit chips. The first ones used a pair of large vacuum radio tubes in a plastic case housing the rest of the circuit.. What an Op Amp does is to compare the difference in voltage between the two inputs and amplify the difference as an output signal. Inputs are typically some sort of AC waveform. Each particular design handles a particular range of input voltages and the maximum voltage of the amplified output. Consult the schematic for the particular values and build your circuit around the chip. Many Op Amp circuit designs employ feedback. This is running the output back to one of the inputs. The advantages of this design is it frequently improves the stability of the circuit. These are the basic facts concerning Op Amps. There is a lot more information and thousands of circuit diagrams employing Op Amp chips.
2016-03-26 22:39:19 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Can you write the gain for a non-inverting amplifier in terms of Rf and Ri ? You need to be able to do that first. Now set the Rf to 0 and then what is the gain of the output? This will answer your question. You should be able to find a formula for the gain of a non-inverting amplifier or use some of the principals that you have been learning to create the formula for yourself.
2006-09-12 14:54:41 · answer #3 · answered by rscanner 6 · 1⤊ 0⤋
It would be clipped, the output would be fed back to the input and it would amplify it, after a couple of cycles the amplifier would be into saturation.
2006-09-12 14:47:13 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Yup, if you short Rf the gain goes to unity.
2006-09-12 17:20:34 · answer #5 · answered by Stewart H 4 · 0⤊ 0⤋