need
When designing the amplifier circuit, it is necessary to use simulation software for assistance. Proteus is used here, as shown in the following figure, a simple co-directional amplifier circuit.
The ANALOG library that comes with proteus includes almost all amplifier components of ADI, which is very convenient for us to use, as shown below:
question
Single power supply does not display waveform problems
In the simulation software, if a single power supply is used for power supply, follow the circuit diagram below:
This is a simple non-inverting amplifier circuit, powered by a single power supply, and the amplification factor is 5 times. The excitation source we added is as follows:
According to our analysis, the output terminal should be a sine wave of 500mv. But we actually run and found:
There is no waveform at the output, and the voltage is constant at 0.01V.
In fact, this is not a proteus simulation problem, but we use a single power supply, and the excitation source is 100mv, so its fluctuation range is between -100mv and +100mv, resulting in a large difference between it and the 1.65V of the reverse input of the amplifier. The amplifier will always output 0V.
We can solve the problem by using dual power supplies to power the amplifier, as shown in the figure below:
You can also add an offset to the excitation source, as shown in the figure below:
Results:
