Characteristics of integrated circuit chip decryption]
Update date：2012-7-24
IC is in the same piece of silicon after oxidation, lithography, diffusion, epitaxy, steamed aluminum process, the connection of the transistors, resistors, capacitors and other components and circuits are integrated on a semiconductor substrate, and finally encapsulatedform a complete circuit. It is small, where the amount of light, low power consumption, reliable, widely used in signal production, operations, transform, and therefore occupies an important position in the field of automatic control and measuring instruments. IC can be divided into two major categories of analog integrated circuits and digital integrated circuits, integrated operational amplifier is a kind of analog integrated circuits, a high-gain direct stove amplifier. Analog integrated circuits has the following characteristics.
(1) the circuit structure and component parameters symmetry; components manufactured by the integration process, although the accuracy of the parameter is not very high, the humidity is relatively large, but because the relevant components of the circuit are the same in a small a silicon chip, manufactured using the same process, so the absolute value of the parameters of the components have the same deviation, temperature consistency, the same characteristics as the tube, the resistance values are equal.
(2) active devices instead of passive components: resistive element of semiconductor devices, the range of tens of Europe to dozens of dry-European high-value resistor bipolar transistor or FET constant current source circuit alternative or external.
(3) of the composite structure of circuits: better circuit performance of the composite pipe, production.
(4) junction with the launch of the bipolar transistors instead of diodes. The following tens of picofarads capacitance of PN junction capacitance needs a large capacitor will have to use an external.
(5) level using a direct pot together 3F; the use of diode temperature compensation and potential offset.
Analog integrated operational amplifier, differential amplifier circuit, current source composed of several parts. Among them, the current source provides a bias current of the entire circuit, and amplifier active load; differential amplifier circuit as an integrated operational amplifier input stage for the suppression of zero drift.
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