Op amps can be categorised based on various factors, such as:
Power supply configuration:
Input and output configuration:
- Inverting op amps
- Non-inverting op amps
- Bipolar Junction Transistor (BJT) based op amps
- Field-Effect Transistor (FET) based op amps
- Complementary Metal-Oxide-Semiconductor (CMOS) based op amps
Op amps can come in different variations, depending on the task required. The first of these amplifying circuits is a dual power supply op amp. This amplifying circuit has input from two different power supplies and amplifies the difference between these power supplies.
The dual supply amplifier has an AC signal input and positive voltage as one power supply and a negative voltage as another power supply. These power supplies create the range in which the output amplified current can alternate. Because of the second negative power supply, a full waveform can be created at the amplifier output.
This is different to a single power supply op amp. In this circuit, there is only one positive supply, with a ground acting as a negative power supply. Like the dual supply operational amplifier, the circuit has an alternating input. However, unlike the dual supply amplifier, the output signal is not a full waveform.
This is because the negative charge inputted into the amplifier circuit is ground, meaning that the current can only alternate to a voltage as low as zero volts. To summarise, the range of the outputting alternating signal is reduced in a single power op amp, due to its singular power supply.