STMicroelectronics Unveils Breakthrough in Passive Integration Technology

October 10, 2005

STMicroelectronics today unveiled the first details of a breakthrough technology that significantly increases junction capacitance density in thin-film passive integration.

The new technology greatly extends the capabilities of ST’s world-leading IPAD (Integrated Passive and Active Devices) technology by allowing capacitors with densities of more than 30nF/mm2 to be integrated, which represents a 50-fold improvement over existing competitive technologies that employ materials such as oxides or nitrides of silicon or tantalum.

The new technology is based on a class of materials called PZT Perovskites. Essentially, these are compounds that contain Lead, Zirconium, Titanium and Oxygen, with many different variations possible according to the ratio of zirconium and titanium. These materials offer outstanding advantages because of their very high dielectric constant, which, at approximately 900 depending on the particular material, is over two hundred times greater than that of silicon dioxide. Equally importantly, they can be integrated cost-effectively into the proven, high-volume IPAD manufacturing flow.

The integration of passive devices is of fundamental importance, especially in all nomadic applications where complex filtering and protection functions, which typically demand a large number of passive components such as resistors, capacitors and inductors, must be incorporated into equipment where PCB space is at a premium. For example, a typical mobile phone requires several hundred passive components, over half of which are capacitors. ST’s IPAD technology allows large numbers of passive components to be integrated along with active devices such as ESD protection diodes into a single structure that performs a specified filtering or protection function.

A continual challenge in this type of integration is the search for new materials that allow ever increasing values of resistance or capacitance to be integrated. In the case of capacitors, the dielectric constant of the material is the most important factor because the capacitance is determined by the surface area, which it is always desired to minimize, and the dielectric constant. ST’s new PZT technology represents a major breakthrough in integrating the higher value capacitors that are typically required for decoupling and low-frequency filtering purposes.

This will bring considerable benefits to customers by enabling a new level of system partitioning optimization in terms of size, performance, cost and time-to-market, as a single IPAD component can replace more than 30 discrete devices with one die that is compatible with Flip-Chip packaging technology or SiP assembly with IC’s.

STMicroelectronics invented IPAD technology and is a leading supplier of IPAD devices worldwide. The new PZT technology will increase this leadership by allowing more integration and much better frequency behaviour as a result of reduced parasitic effects achieved by removing the SMD packages used today and designing shorter PCB interconnections.

To date, ST has used this technology for a number of customer-specific devices and will shortly introduce standard devices for the open market, when it will also release further technical details.

Source: STMicroelectronics

Explore further: Breakthrough in controlling light transmission

Related Stories

Breakthrough in controlling light transmission

February 8, 2018

Operation of modern-day technology requires an ever-increasing use of broadband frequency signals. This, in turn, has grown the demand for reliable, efficient methods of signal transmission that prevent interference and are ...

Developing new dental devices for the elderly

January 30, 2018

Thirty years ago, Stephen Shuman, D.D.S., M.S., never would have imagined he'd be working with aerospace engineers on oral health issues. Now, the associate professor in the School of Dentistry works with them on a regular ...

Light-erasable memory promising for system-on-panel displays

December 20, 2017

Researchers have designed a memory device based on atomically thin semiconductors and demonstrated that, in addition to exhibiting a good performance in general, the memory can also be fully erased with light, without any ...

Recommended for you

Unprecedented study of Picasso's bronzes uncovers new details

February 17, 2018

Musee national Picasso-Paris and the Northwestern University/Art Institute of Chicago Center for Scientific Studies in the Arts (NU-ACCESS) have completed the first major material survey and study of the Musee national Picasso-Paris' ...

Scientists shed light on biological roots of individuality

February 16, 2018

Put 50 newborn worms in 50 separate containers, and they'll all start looking for food at roughly the same time. Like members of other species, microscopic C. elegans roundworms tend to act like other individuals their own ...

Researchers create first superatomic 2-D semiconductor

February 16, 2018

Atoms are the basic building blocks of all matter—at least, that is the conventional picture. In a new study, researchers have fabricated the first superatomic 2-D semiconductor, a material whose basic units aren't atoms ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.