The great god, if op-amp single power supply, input signal and output signal shall not exceed the scope of power supply is you don't need to add bias?
If I use LM358 op-amp single power supply, input and output signals are all within the scope of the power supply, why the signal back-end oscillation will have?

CodePudding user response:

The input signal and output signal shall not exceed the scope of power supply is you don't need to add bias?
Yes

The input and output signals are within the scope of the power supply, why the signal back-end oscillation will have?
Oscillation has nothing to do with input and output voltage range, with operational amplifier gain,

CodePudding user response:

You say what is what kind of oscillations, 358 can double gain stable, self-excited usually doesn't happen, the input voltage range is 0 to 2 v v to supply voltage. No circuit are given, unable to specific analysis, guess you became oscillator circuit,

CodePudding user response:

In theory, the positive feedback, and the loop gain is enough big, can produce oscillation, so from two angles of check: a, confirm the circuit connection, rule out the possibility of positive feedback; Two, amplifier + feedback loop, reducing the loop gain

CodePudding user response:

Certainly need to offset

CodePudding user response:

Single power supply must add offset, this is one of the characteristics of operational amplifier, the output swings, operational manual, there will be a power supply voltage and the output amplitude, the relationship between the record is clear

CodePudding user response:

First 358 as a single power supply is not very good, should choose special single power supply chip,
Second, volatility and high gain, wiring, and output and input of the coupling, etc. There are a lot of relationship, can not say a word, the circuit diagram?

CodePudding user response:

Do you have 104 capacitance output to meet?

CodePudding user response:

To learn, so many masters are very experienced

CodePudding user response:

If you use a primary amplifier, mainly ratio is too high,
Have other adverse coupling: such as the layout is not reasonable or improper compensation capacitor (with and without might have problems),
See you the use of the frequency range,