tag: process variation

No Two Chips Are Alike
By Alex Burlak - 27 Jul, 2020 - Comments: 0

As semiconductor processes continue to shrink it’s becoming increasingly challenging to manage the parameters of individual devices not only across the diameter of the wafer, but also across the length of a single chip, especially for a complex chip with a large area. Today’s standard approach to this problem is to assume the worst case and to create a sub-optimal design that accommodates t... » read more

Semiconductor Memory Evolution And Current Challenges
By Michael Hargrove - 16 Jul, 2020 - Comments: 0

The very first all-electronic memory was the Williams-Kilburn tube, developed in 1947 at Manchester University. It used a cathode ray tube to store bits as dots on the screen’s surface. The evolution of computer memory since that time has included numerous magnetic memory systems, such as magnetic drum memory, magnetic core memory, magnetic tape drive, and magnetic bubble memory. Since the 19... » read more

Monitoring IC Abnormalities Before Failures
By Anne Meixner - 07 Jul, 2020 - Comments: 0

The rising complexities of semiconductor processes and design are driving an increasing use of on-chip monitors to support data analytics from an IC’s birth through its end of life — no matter how long that projected lifespan. Engineers have long used on-chip circuitry to assist with manufacturing test, silicon debug and failure analysis. Providing visibility and controllability of inter... » read more

Monitoring For In-Die Process Speed Detection
By Richard McPartland - 14 May, 2020 - Comments: 0

Chip designers working on advanced nodes typically include a fabric of sensors spread across the die for a number of very specific reasons. In this, the second of a three-part blog series, we explore some of the key applications and benefits of these types of sensing solutions. In this installment, the focus is In-Die Process Speed Detection and why understanding in-chip process speed detecti... » read more

Avoiding Gloom With Better Knowledge
By Stephen Crosher - 12 Mar, 2020 - Comments: 0

The rate of product development is facing very real challenges as the pace of silicon technology evolution begins to slow. Today, we are squeezing the most out of transistor physics, which is essentially derived from 60-year-old CMOS technology. To maintain the pace of Moore’s law, it is predicted that in 2030 we will need transistors to be a sixth of their current size. Reducing transistor s... » read more

Wrestling With Variation In Advanced Node Designs
By Ann Mutschler - 19 Feb, 2020 - Comments: 5

Variation is becoming a major headache at advanced nodes, and issues that used to be dealt with in the fab now must be dealt with on the design side, as well. What is fundamentally changing is that margin, which has long been used as a buffer for variation and other manufacturing process-related problems, no longer works in these leading-edge designs for a couple of reasons. First, margin im... » read more

Analog Simulation At 7/5/3nm
By Ed Sperling - 27 Jan, 2020 - Comments: 0

Hany Elhak, group director of product management at Cadence, talks with Semiconductor Engineering about analog circuit simulation at advanced nodes, why process variation is an increasing problem, the impact of parasitics and finFET stacking, and what happens when gate-all-around FETs are added into the chip. » read more

Interdependencies Complicate IC Power Grid Design
By Ann Mutschler - 12 Dec, 2019 - Comments: 0

Creating the right power grid is a growing problem in leading-edge chips. IP and SoC providers are spending a considerable amount of time defining the architecture of logic libraries in order to enable different power grids to satisfy the needs of different market segments. The end of Dennard scaling is one of the reasons for the increased focus. With the move to smaller nodes, the amount of... » read more

A Study Of Next-Generation CFET Process Integration Options
By Benjamin Vincent - 21 Nov, 2019 - Comments: 0

Decision making is a critical step in semiconductor technology development. R&D semiconductor engineers must consider different design and process options early in the development of a next-generation technology. Established techniques such as Failure Mode and Effect Analysis (FMEA) can be used to select among the most promising design and process choices. Once specific design and process m... » read more

Making Random Variation Less Random
By Ed Sperling - 21 Oct, 2019 - Comments: 0

The economics for random variation are changing, particularly at advanced nodes and in complex packaging schemes. Random variation always will exist in semiconductor manufacturing processes, but much of what is called random has a traceable root cause. The reason it is classified as random is that it is expensive to track down all of the various quirks in a complex manufacturing process or i... » read more

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