I believe that people who do hardware design should know that the role of operational amplifiers and operational amplifiers cannot be ignored in circuit design. As the most versatile analog device, the operational amplifier is widely used, and has been widely used in ADC sampling front end, signal conversion conditioning, power supply circuit and other occasions. In the university, in the process of learning the model, I believe that everyone is also very headaches for the op amp, which is the most difficult to debug for its magnification. Moreover, the circuit diagram of the operational amplifier is particularly large, which has caused us a lot of troubles. Let us learn the operational amplifiers and learn the knowledge of operational amplifiers.
First introduce the basic circuit diagram of the lower op amp:
The op amp is a DC-coupled, differential-mode (differential mode) input, usually a single-ended output high-gain voltage amplifier. Although the op amp's peripheral circuitry is simple, there are still many areas to be aware of during use.
The operational amplifier has two input terminals and one output terminal. As shown in the above figure, the input terminal marked with "+" is "in-phase input terminal", and the input terminal labeled "one" is "inverting input terminal". If the same signal is input from the two input terminals respectively, an output signal with the same voltage but opposite polarity is obtained at the output end; the output signal of the output terminal is in phase with the signal of the in-phase input terminal, and the signal with the inverting input terminal Inverted.
Usually when we use an op amp in a circuit design, we typically connect its output to its inverting input to form a negative feedback configuration. This is the state shown in the above figure, because the voltage gain of the op amp is very large, ranging from hundreds to tens of thousands of times, using negative feedback to ensure stable operation of the circuit.
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