lec08_-_mos_and_cmos - Copy

lec08_-_mos_and_cmos - Copy - Microelectronics(Part 3...

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1 Microelectronics (Part 3) Chapter 7: MOS Transistor and CMOS Circuit
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Course Outcomes CO1: Ability to apply the semiconductor CMOS technology in digital circuits 2
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1-<3> Topics to be covered CMOS Technology MOS Transistor and Switch Pass and Transmission Transistor CMOS Inverter: DC Analysis CMOS Inverter: Transient Analysis CMOS Inverter: Power Dissipation CMOS for Combinational Logic CMOS for Sequential Logic CMOS Layout
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1-<4> CMOS Technology CMOS Complementary Metal Oxide Semiconductor as main technology behind the integrated circuit industry CMOS advantages: Low power (current consumption comes from switching as those capacitors are charged and discharged High level of integration (inverter consist of two transistors) VLSI (very large scale integration): Achievable through the use of CMOS technology A lot of functions on a single piece of silicon a lot of logic for the size, cost and power. CMOS technology uses two types of MOS transistors: p-type transistor (pMOS) n-type transistor (nMOS)
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1-<5> MOS Transistors MOS transistor: A device in which the current flowing in a conducting channel between source and drain is controlled by the voltage applied to the gate. n p gate source drain substrate n n p gate source drain substrate n GND GND V DD GND +++++++ - - - - - - - channel Gate = 0 , so it is OFF (no connection between source and drain) Gate = 1 , so it is ON (channel between source and drain)
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1-<6> Transistors Logic gates are usually built out of transistors Transistor is a three-ported voltage-controlled switch Two of the ports are connected depending on the voltage on the third port For example, in the switch below the two terminals (d and s) are connected (ON) only when the third terminal (g) is 1 g s d g = 0 s d g = 1 s d OFF ON
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1-<7> Transistor Function g s d g = 0 s d g = 1 s d g d s d s d s nMOS pMOS OFF ON ON OFF
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