[introduction]A few years ago, when commerce exhibits go to work to make, somebody asks me: “Is people still using operation amplifier? My yell, because operation amplifier market estimates more than 3 billion dollar, and still be in growth. But to quizing person for, long-tested operation amplifier had existed for a long time, although because engineering technology, buildup framework is mixed,design a technology, it was experienced improve, but it basically is identical. In view of operation amplifier nowhere is absent, let our drop back one pace, review the component of operation amplifier, and why it is so useful still in current electronic product.

Is people still using operation amplifier?

A few years ago, when commerce exhibits go to work to make, somebody asks me: “Is people still using operation amplifier? My yell, because operation amplifier market estimates more than 3 billion dollar, and still be in growth. But to quizing person for, long-tested operation amplifier had existed for a long time, although because engineering technology, buildup framework is mixed,design a technology, it was experienced improve, but it basically is identical. In view of operation amplifier nowhere is absent, let our drop back one pace, review the component of operation amplifier, and why it is so useful still in current electronic product.

Operation amplifier is one kind uses two inputs (be inputted instead and input in phase) electronic equipment, an output and a double power source, if pursue,graph symbol place shows 1 medium principle.

Graph 1: Long-tested operation amplifier

Operation amplifier magnifies two input the poor value between signal to output signal in order to arise. Ideal operation amplifier is the academic parts of an apparatus that has the following character:

Gain of infinite open loop: Output voltage is equal to input voltage to multiply be worth with the difference between infinity. This character allows the input signal with operation amplifier the smallest enlarge.

Input impedance indefinitely: It won’t absorb electric current from input source. This makes operation amplifier OK cooperate to use with the tall impedance source such as sensor and transducer, and won’t affect input signal.

0 output impedance: It is OK drive any laden and do not affect output voltage. This one character makes operation amplifier suits the low impedance load such as drive loudhailer very much.

Infinite bandwidth: It can magnify the signal of any frequency. This character allows operation amplifier to be used at needing the application of high frequency enlarge, for example RF amplifier.

0 inputs are maladjusted voltage: When input voltage is equal, output voltage will is 0. This character allows operation amplifier to be used at needing the application that accurate signal processes.

Place without voltage limiting rate: It can answer the change that inputs signal instantly. This character allows operation amplifier to be used at needing the application that fast signal processes, for example high speed data is transmitted.

Although be in real world,can satisfy without operation amplifier all these ideal are characteristic, but contemporary operation amplifier can satisfy a lot of among them character almost. Design personnel choice suits his most the operation amplifier that specific application asks, consider the actual limitation of parts of an apparatus at the same time.

The place before be like is narrated, operation amplifier continues to be used at all sorts of electron products. A few the commonnest application of operation amplifier are as follows:

Amplifier: Operation amplifier can use as voltage amplifier, in order to increase the scope of input signal. The gain of amplifier compares a decision by what counter feed block and input resistance.

Filter: Operation amplifier can be used at compose to build all sorts of filter, include to be connected high, low, belt connect and take block filter. These filter are used at the frequency that does not need from the purify in signal.

Comparator: Operation amplifier can use as comparator, indicate the output signal with which louder voltage with comparing two voltage to arise. This detects in n, threshold value detects and in the application such as wide modulation of arteries and veins very useful.

Oscillator: Operation amplifier can be used at compose to be built below specific frequency to produce the oscillator of sine weaveform. Operation amplifier oscillator has a variety of kinds, oscillator of bridge of the favour that be like dimension, move photograph oscillator and crystal oscillator.

Manostat: Operation amplifier can be used at compose to build manostat, no matter input voltage or load how to change, can maintain constant output tension. Manostat is used at all sorts of electron equipment, for example amplifier of power source, frequency and electric machinery controller.

Appearance amplifier: Operation amplifier can be used at compose to build appearance amplifier, with the signal with very small enlarge, come from the signal of sensor or transducer for example. Appearance amplifier has tall input impedance, low output impedance and Gao Gongmo to restrain than.

Integrator and differential implement: Operation amplifier can use as integrator and differential implement, execute mathematical operation to signal. The output signal that integrator generates and the integral that input signal become scale, and differential implement the output signal of generation and the derivative that input signal become scale.

Overall and character, operation amplifier is the essential element in a lot of electron circuit, its versatility and the popular option that use a gender easily to continue to make its become stylist and engineer.

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