What Is a CMOS Transistor?

The cmos transistor, a metal-oxide-semiconductor (Metal-Oxide-Semiconductor) structured transistor is referred to as a MOS transistor for short.

cmos transistor

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A metal-oxide-semiconductor (Metal-Oxide-Semiconductor) structured transistor is referred to as a MOS transistor, which is divided into a P-type MOS tube and an N-type MOS tube. by

CMOS digital integrated circuit is a circuit composed of a clever combination of NMOS tube and PMOS tube, and belongs to a digital integrated circuit with micro power consumption. The main series are:

1. Standard 4000B / 4500B series This series is based on the CD4000B series and CD4500B series of the American RCA company, and is fully compatible with the MC14000B series and C14500B series of Motorola of the United States. The main features of this series of products are wide operating power supply voltage range (3 to 18V), minimum power consumption, low speed, many varieties, and low prices. They are currently the main application products of CMOS integrated circuits.

2. 74HC-series 54 / 74HC-series is a series of high-speed CMOS standard logic circuits. It has the same operating degree as 74LS-series, low power consumption inherent in CMOS integrated circuits, and wide power supply voltage range. 74HCxxx is a duplicate of 74LSxxx with the same serial number. The last few digits of the model are the same, indicating that the logic function and pin arrangement of the circuit are completely compatible, which provides convenience for replacing 74LS with 74HC.

3. 74AC-Series This series is also called "advanced CMOS integrated circuit". The 54 / 74AC series has the same working speed as the 74AS series, low power consumption and wide power supply voltage range inherent to CMOS integrated circuits. The main features of CMOS integrated circuits are:

(1) Has very low static power consumption. When the power supply voltage VCC = 5V, the static power consumption of the medium-scale integrated circuit is less than 100mW.

(2) Has a very high input impedance. Normally working CMOS integrated circuits have their input protection diodes in a reverse-biased state with DC input impedance greater than 100M.

(3) Wide power supply voltage range. The power supply voltage of CMOS integrated circuit standard 4000B / 4500B series products is 3 ~ 18V.

(4) Strong fan-out capability. In low-frequency operation, one output can drive more than 50 inputs of CMOS devices.

(5) Strong anti-interference ability. The voltage noise tolerance of CMOS integrated circuits can reach 45% of the power supply voltage value, and the noise tolerance values of high and low levels are basically equal.

(6) The logic swing is large.

When the CMOS circuit is under no load, it outputs high-level VOHVCC-0.05V and low-level V0L0.05V. Performance characteristics of CMOS integrated circuits Micro power consumptionThe single-gate static power consumption of CMOS circuits is on the order of nanowatts (nw). High noise marginThe noise margin of CMOS circuits is generally above 40% of the supply voltage. Wide operating voltage rangeThe power supply voltage of CMOS circuits is generally 1.5 ~ 18 volts. High logic swingThe amplitude of the high and low levels of the output of the CMOS circuit reaches full power "1" for VDD and logic "0" for VSS. High input impedance-The input impedance of CMOS circuits is greater than 108 and generally up to 1010. High fan-out capability-The fan-out capability of CMOS circuits is greater than 50. Low input capacitance--The input capacitance of CMOS circuits is generally not greater than 5PF.