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l .lIn troduction of CMOS plate
The CMOS (C~mplernentar~Me tal Oxide Semiconductor) is an on-board
semiconductor chip, which requires very low power generated fromvarious
types of CMOS batteries. This chip is used to store important system
informat ion and configuration settings while the computer is off and on.
CMOS semiconductors use both NMOS (negative polarity) and PMOS (positive
polarity) circuits. Since only one of the circuit types is on at any given
time, the chips require less power than chips using just one type of
transistor. This makes them particularly attractive for use in
battery-powered devices, such as portable computers. Personal computers
als0 contain a smal1 amount of battery-powered CMOS memory to hold the
date, time, a.nd system setup parameters.
1.2 Problem description
The size of the CMOS chip, used in this project, is about IOmrn* 5mm*2m.
The CMOS is a very sensitive and precise electronic device. The complex
work environment, such as high temperature, dust and external impact, has
a high influence in the performance of the CMOS. A cap, assembled outside
the CMOS, is used to prevent the dust, keep cool and buffer the external
impact and wear. At the Same time, cost should be considered in design
process.