#chip design

A new type of computing chip could be a game-changer. That’s because its transistors are not made of silicon. Transistors are tiny electronic switches that together perform calculations. A new prototype uses carbon nanotubes. It is not yet as speedy or as small as the silicon devices found in today’s computers, phones and more. But these new computer chips may one day give rise to electronics that are faster and use less energy.

Researchers describe their advance in the August 29 Nature.

This is “a very important milestone in the development of this technology,” observes Qing Cao. He’s a materials scientist at the University of Illinois at Urbana-Champaign. He was not involved in the work.

The heart of every transistor is a semiconductor component. It’s usually made of silicon. This element can act like an electrical conductor. It also can act like an insulator. This lets a transistor have an “on” and an “off” state. When on, current flows through the semiconductor; when off, it doesn’t. And this on/off state is what encodes the 1s and 0s of digital computer data.

Max Shulaker is an electrical engineer. He works at the Massachusetts Institute of Technology in Cambridge. “We used to get exponential gains in computing every single year,” he says. Computer engineers were able to do so by building smaller and faster silicon transistors. But now, he says, “performance gains have started to level off.” Silicon transistors can’t get much smaller and more efficient than they already are.

Carbon nanotubes, though, are almost as thin as an atom. And they ferry electricity well. As a result, they make better semiconductors than silicon. In principle, carbon nanotube processors could run three times faster than silicon ones. And they would consume about one-third as much energy as silicon processors, Shulaker says. But until now, carbon nanotubes have proved too finicky to use in complex computing systems.

Carbon computing

One issue comes when a network of carbon nanotubes is deposited onto a computer chip wafer. At that point, the tubes tend to bunch into lumps. This prevents the transistor from working. It’s “like trying to build a brick patio, with a giant boulder in the middle of it,” Shulaker says. His team solved that problem. They spread nanotubes on a chip. Then they used vibrations to gently shake unwanted bundles off the layer of nanotubes.

A new kind of computer chip (array of chips on the wafer pictured above) contains thousands of transistors made from carbon nanotubes, not silicon. The prototypes can't yet compete with silicon chips for size or speed. But carbon-nanotube-based computing promises to usher in a new era of electronics that are faster and more energy efficient.   CREDITL G. Hills et al/Nature 2019

The team also faced another problem. Each batch of carbon nanotubes contains about 0.01 percent metallic nanotubes. Metallic nanotubes can’t properly flip between conductive and insulating. So these tubes can muddle a transistor’s readout.

Shulaker and colleagues searched for a workaround. To perform different kinds of operations on bits of data, transistors can be configured in various ways. The researchers looked at how metallic nanotubes affected different configurations. They found that defective nanotubes affected the function of some configurations more than others. This is similar to the way a missing letter can make some words illegible, but leave others mostly readable. So the researchers carefully designed the circuitry of their microprocessor. They avoided configurations that were most confused by metallic-nanotube glitches.

“One of the biggest things that impressed me about this paper was the cleverness of that circuit design,” says Michael Arnold. He’s a materials scientist at the University of Wisconsin–Madison. He was not involved in the work.

The resulting chip has more than 14,000 carbon-nanotube transistors. It executed a simple program to write the message, “Hello, world!” This is the first program that many newbie computer programmers learn to write.

The new chips are not yet ready to unseat silicon ones in modern electronics. Each carbon transistor is about a millionth of a meter across. Current silicon transistors are smaller. They are tens of billionths of a meter across. Each carbon-nanotube transistor in this prototype can flip on and off about a million times a second. Silicon transistors can flicker billions of times per second. That puts nanotube transistors on a par with silicon transistors of the 1980s.

In the era of wireless communication and connected devices, RF Design (Radio Frequency Design) plays a crucial role in enabling seamless data transmission across systems. As industries adopt technologies like 5G, IoT, and advanced automotive electronics, the need for precise and efficient RF design has become more important than ever.

For software companies, chip design engineers, and semiconductor businesses, RF design is not just a technical function, it is a key driver of product innovation, performance, and long-term scalability.

Understanding RF Design in Modern Systems

RF design focuses on creating circuits and systems that operate at high frequencies, typically in the radio spectrum. These systems are responsible for transmitting and receiving signals without distortion, delay, or interference.

Unlike low-frequency digital circuits, RF systems require deep expertise in electromagnetic behavior, signal propagation, and circuit optimization. Even minor inefficiencies can lead to signal loss, reduced range, or performance instability, making RF design a highly specialized domain within semiconductor engineering.

Key Challenges in RF Design

Designing RF systems involves addressing several complex challenges. Engineers must ensure proper impedance matching to maximize power transfer while minimizing signal reflection. Noise management is also critical, as unwanted interference can significantly impact system performance.

Additionally, RF components must be optimized for power efficiency, especially in battery-operated devices. Thermal management, compact design requirements, and integration with digital systems further add to the complexity.

For chip design engineers and semiconductor companies, overcoming these challenges requires advanced tools, simulation techniques, and domain expertise.

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Effective RF design services provide end-to-end solutions that support the entire product development lifecycle. These capabilities typically include:

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Why RF Design Matters for Your Business

For software companies, RF design ensures seamless integration between hardware and software components, leading to improved system functionality. Chip design engineers benefit from optimized RFIC development, enabling the creation of compact and high-performance chips.

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Conclusion

RF design is a critical enabler of today’s connected world. As technologies continue to evolve, the demand for high-quality RF engineering will only increase.