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technologia: NMOS logic

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NMOS AND-by-default logic can produce unusual glitches or buggy behavior in NMOS components, such as the 6502 "illegal opcodes" which are absent in CMOS 6502s.

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NMOS or nMOS logic (from N-type metal–oxide–semiconductor) uses n-type (-) MOSFETs (metal–oxide–semiconductor field-effect transistors) to implement logic gates and other digital circuits. NMOS transistors operate by creating an inversion layer in a p-type transistor body. This inversion layer, called the n-channel, can conduct electrons between n-type source and drain terminals. The n-channel is created by applying voltage to the third terminal, called the gate. Like other MOSFETs, nMOS transistors have four modes of operation: cut-off (or subthreshold), triode, saturation (sometimes called active), and velocity saturation. NMOS AND-by-default logic can produce unusual glitches or buggy behavior in NMOS components, such as the 6502 "illegal opcodes" which are absent in CMOS 6502s. In some cases such as Commodore's VIC-II chip, the bugs present in the chip's logic were extensively exploited by programmers for graphics effects. For many years, NMOS circuits were much faster than comparable PMOS and CMOS circuits, which had to use much slower p-channel transistors. It was also easier to manufacture NMOS than CMOS, as the latter has to implement p-channel transistors in special n-wells on the p-substrate, not prone to damage from bus conflicts, and not as vulnerable to electrostatic discharge damage. The major drawback with NMOS (and most other logic families) is that a direct cu…

Kategoria: technologia

Rodzina: technologia

Jakość źródła: 65/100

Próby weryfikacji: 3

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Wikipedia ENPOTWIERDZAniezależne

Evidence: 100 • authority: 72

NMOS or nMOS logic (from N-type metal–oxide–semiconductor) uses n-type (-) MOSFETs (metal–oxide–semiconductor field-effect transistors) to implement logic gates and other digital circuits. NMOS transistors operate by creating an inversion layer in a p-type transistor body. This inversion layer, called the n-channel, can conduct electrons between n-type source and drain terminals. The n-channel is created by applying voltage to the third terminal, called the gate. Like other MOSFETs, nMOS transistors have four modes of operation: cut-off (or subthreshold), triode, saturation (sometimes called active), and velocity saturation. NMOS AND-by-default logic can produce unusual glitches or buggy be…

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Institute of Electrical and Electronics Engineers (IEEE)pomocniczeniezależne

Evidence: 20 • authority: 88

NMOS Based Dynamic Logic Design for High Speed Circuits. Domino logic circuits inherent speed and area efficiency benefits make them essential for high-speed and low-power digital applications. However, particularly in contemporary, massively scaled technologies, traditional domino logic architectures typically encounter issues such as excessive power waste, higher delay, and lower noise immunity. To overcome these constraints, we suggest two to three improved circuit designs that offer new designs on traditional domino logic. To meet the demands of diverse high-performance applications, each design concentrates on certain performance improvements, such as lowering power consumption, enhanc…

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IREpomocniczeniezależne

Evidence: 20 • authority: 80

A highly reliable 16 output high voltage NMOS/CMOS logic IC with shielded source structure

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AIP Publishingpomocniczeniezależne

Evidence: 20 • authority: 80

Design and analyze output power of two bit magnitude comparator using NMOS logic compared with CMOS logic

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