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CMOS :
Complementary Metal Oxide Semiconductor
It is used in Microprocessors,
Microcontrollers and many electronic digital logic circuits. It is a semi-conductor chip
that keeps data without requiring any external power source.
This technology uses both N-type and P-type
transistors , they both are
used to conclude logic functions. CMOS technology is a
semiconductor technology for latest microcontrollers such as
8051,8052 Microchips.
There is Low Power Consumption. In Vocabulary of Processors
CMOS keeps the major instructions the computer requires to
initialize its hardware components and boot up. There is High
Noise Immunity in these type of devices that is No effect of
High Noise. It uses both N
Type and P type transistors.
In the figure above (CMOS inverter) when
the voltage of input X is low NMOS transistor has high
resistance while PMOS has low resistance and it allows
voltage source to transfer voltage through PMOS transistor
to output which is generally high voltage.
The main point of CMOS over
NMOS and bipolar technology is the much smaller power usage
then them. This allows to integrate many more CMOS gates on an
IC than in NMOS or bipolar
technology, resulting in much better performance. Unlike NMOS
or bipolar circuits, a CMOS circuit has almost no static power
dissipation
e.g CD4001, CD4002, CD4025
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