Integrated operational amplifier is abbreviated as integrated operational amplifier, which is an integrated circuit with high magnification. Inside it is a directly coupled multi-stage amplifier, and the whole circuit can be divided into three parts: input stage, intermediate stage and output stage. The input stage uses a differential amplifier circuit to eliminate zero drift and suppress interference; the intermediate stage generally uses a common emitter circuit to obtain a sufficiently high voltage gain; the output stage generally uses a complementary symmetrical power amplifier circuit to output sufficient voltage and current. The output resistance is small and the load capacity is strong.
Integrated operational amplifiers are widely used in analog signal processing and generation circuits. Because of their high performance and low price, in most cases, they have replaced discrete original amplifier circuits!
Features of integrated op ampâ‘ The voltage magnification is generally 104~106, and some have reached 107 or more;
②The output impedance is very low, generally below tens of Ω;
③The input impedance is very high, generally a few hundred kΩ or more;
â‘£The frequency band is very high, the lowest frequency band is zero, and the highest frequency band can reach more than ten kHz to hundreds of kHz.
Integrated op amp functionThe integrated operational amplifier is actually a DC amplifier integrated block with a large (open loop) amplification factor.
What is its function depends on how you use it. Collected together, there should be:
1. Add a linear feedback circuit to make an ordinary AC or DC linear amplifier;
2. Add a non-linear feedback circuit to make a special AC or DC amplifier;
3. Add an RC feedback circuit to make an integral output circuit;
4. Open loop use, as AND gate or NOT gate circuit;
5. Open-loop use, as a comparison circuit.
Ideal conditions for integrated op amps1. The open-loop voltage magnification is infinite;
2. The input resistance is infinite;
3. The output resistance is zero;
4. The common mode rejection ratio is infinite.
Linear application of integrated operational amplifier 1. Inverting amplifier circuitSimulation circuit
Input and output voltage, the visible gain is 5
Input and output waveform
Circuit diagram:
Verification: The two on the left are the input, and the right is the output AC and DC voltage, which meets the design requirements
Input and output waveform
Circuit diagram
Input and output waveform
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