Computer & Digital Awareness20 Concepts & Facts

Moore’s Law & Semiconductor Scaling GK Questions & Answers

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Moore's Law is a foundational economic and technological observation that guided the rapid advancement of modern computing for more than half a century. In an April 1965 article published in Electronics magazine, chemist and Intel co-founder Gordon Moore noted that the number of transistors packed onto an integrated circuit had doubled roughly every twelve months since the invention of the planar transistor. A decade later, at the 1975 IEEE International Electron Devices Meeting, Moore revised his forecast to a doubling cadence of approximately every two years. Although framed as a law, the concept was never an immutable physical constant; rather, it operated as a self-fulfilling industrial roadmap that synchronized global research investments, capital equipment production, and manufacturing milestones across the worldwide electronics sector.

The enduring validity of Moore's Law was long sustained by Dennard scaling, formulated in 1974 by IBM researcher Robert Dennard. Dennard established that as silicon transistors shrank in physical dimensions, their operating voltage and current decreased proportionally, meaning that power density remained constant while clock speeds climbed without excessive overheating. This geometric scaling allowed chipmakers to pack billions of tiny switches onto silicon wafers without melting the processor dies. However, around 2005, Dennard scaling collapsed because sub-micron gate oxide layers became so thin that quantum tunneling caused massive leakage currents, producing uncontrollable thermal dissipation. As single-core clock frequencies stalled around four gigahertz, the semiconductor industry shifted toward multi-core parallel architectures and specialized accelerators.

To prolong transistor density gains in the deep sub-nanometer era, chip manufacturers abandoned conventional planar transistors in favor of three-dimensional transistor architectures, moving from FinFET designs to gate-all-around nanosheet ribbons. Manufacturing these atomic-scale features requires extreme ultraviolet photolithography machines that print circuits using light wavelengths of only 13.5 nanometers. Recognizing semiconductors as the basis of contemporary geopolitical sovereignty, nations worldwide are investing hundreds of billions in domestic silicon fabrication. Through the India Semiconductor Mission established in December 2021 with an outlay of 76,000 crore rupees, India is actively developing commercial wafer fabrication plants, advanced chip packaging facilities, and integrated compound semiconductor design ecosystems to anchor its digital manufacturing economy.

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Moore's Law is an empirical technological observation that the number of transistors on a microchip doubles approximately every two years.

Gordon Moore, a physical chemist and co-founder of Fairchild Semiconductor and Intel, published the original observation on April 19, 1965.

The original 1965 paper in Electronics magazine predicted an annual doubling cadence, which Moore revised to a two-year cycle in 1975.

Moore's Law is not a physical law of nature, but an industry-wide economic driver and planning cadence for semiconductor fabrication roadmaps.

Transistor scaling reduces the unit manufacturing cost per transistor, making computational power progressively cheaper and more accessible.

Dennard scaling, formulated by Robert Dennard in 1974, stated that power density remained constant as transistors shrank in size.

Dennard scaling broke down around 2005 because static power leakage and quantum tunneling caused chips to overheat at high clock frequencies.

The breakdown of Dennard scaling forced chip designers to abandon single-core frequency scaling and transition toward multi-core parallel computing.

Rock's Law, or Moore's Second Law, observes that the capital cost of building a semiconductor fabrication plant doubles roughly every four years.

#10

Modern leading-edge semiconductor nodes are printed using Extreme Ultraviolet (EUV) photolithography operating at a 13.5-nanometer wavelength.

#11

Dutch corporation ASML is the sole commercial manufacturer of high-numerical-aperture extreme ultraviolet photolithography machines in the world.

#12

Planar metal-oxide-semiconductor field-effect transistors (MOSFETs) were replaced by 3D FinFET structures around 2011 to reduce electron leakage.

#13

Gate-All-Around (GAA) nanosheets wrap conducting gate material around all four sides of horizontal silicon ribbons to maintain electrostatic control.

#14

Silicon reached fundamental physical barriers when transistor gate dielectric layers approached a few atomic layers in thickness, triggering quantum tunneling.

#15

Advanced packaging techniques, including 2.5D interposers and 3D chiplet stacking, allow manufacturers to combine multiple silicon dies into a single package.

#16

The International Technology Roadmap for Semiconductors (ITRS), later renamed the International Roadmap for Devices and Systems, coordinated global chip standards.

#17

The India Semiconductor Mission (ISM) was launched in December 2021 under the Ministry of Electronics and Information Technology with a 76,000 crore outlay.

#18

Under the ISM scheme, the Indian Union Cabinet approved fifty percent fiscal support for eligible commercial silicon wafer fabrication facilities.

#19

Doped silicon remains the dominant semiconductor substrate, alongside wide-bandgap compound semiconductors like gallium nitride and silicon carbide for high-power electronics.

#20

The phrase 'More than Moore' describes functional diversification of chips through integrated sensors, wireless modules, and bio-chips rather than pure scaling.

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Analytical perspective & practical exam advice from the Master10 academic board

Educator's Insight

Moore's Law is essentially an industrial rule of thumb that drove the computing revolution. Gordon Moore realized that chipmakers could double the number of transistors on a silicon wafer every two years while slashing costs. This steady miniaturization allowed computers to shrink from room-sized mainframes into pocketsize smartphones. It succeeded not because nature mandated it, but because tech companies used it as a strict competitive timetable.

In UPSC and SSC examinations, candidates must never confuse Moore's Law with a physical law; it is an empirical projection driven by economics. Pay close attention to Dennard scaling, which explained why chips ran faster without melting until heat dissipation hit a thermal wall around 2005. To remember the transition timelines, use the mnemonic "M-D-M" (Moore 1965 doubling, Dennard 1974 power scaling, Multi-core shift in 2005). For Indian economy questions, review the 76,000 crore India Semiconductor Mission outlay.

Moore’s Law & Semiconductor Scaling GK Questions & Answers

Key Concepts & Self-Assessment20 Key Facts

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