| The 21st century will be the information age, and information technology is the national economy's core technology, his service in all fields, economic peaked communication and integrated circuit based information industry has become the most important national economy guide and the pillar industry, in recent years China's communications and information industry rapid development, IC market directly helped greatly increased global information industry.MAU device this paper metioned meets IEC61158-2 of the Manchester code technology, the maximum data transfer rate of 31.25 Kbit / s. Using SMD housing MLeQ40 package, small size. This MAU device supports all send and receive functions, additional absorption of the bus supply current and has high impedance characteristics. In two and allow the power supply regulated power supply with electrical isolation.This paper uses 0.5μm CMOS technology to design the bandgap voltage reference. In the whole integrated circuit in take gap for the entire system benchmark voltage source voltage or will provide supplied voltage into current, its output voltage stability and precision, loved by chip design engineer. It in analog integrated circuits, digital integrated circuits and mixed-signal IC occupies a place, in both playing their function. The bandgap reference voltage source this paper mentioned is a basic bandgap reference core circuit, output voltage through the op-amp circuit, DAC are amplified voltage, and other circuitry. Bandgap reference voltage generated by the active current mirror circuit, cascade structure, differential amplifier, common source amplifier, and the composition of the source follower. By Hspice simulation of the circuit, bandgap voltage reference circuit layout have been completed and were DRC and LVS checks. Circuit test results meet the design requirements of each module. |
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