Performance Evaluation of Thin-Film Embedded Resistors


Reading time ( words)

Thin-film microstrip circuits have been widely applied in microwave communications, electronic countermeasures (ECM), and aerospace applications, etc. When manufacturing thin-film ICs, it is very important to apply deposited thin-film resistor material to fabricate high-accuracy and highly stable thin-film embedded resistors. Thin-film ICs call for thin-film resistors that meet these stringent requirements:

  1. Square resistance should be wide enough
  2. Temperature coefficient of resistance should be small
  3. Adhesive force with substrate should be strong enough
  4. Thin-film resistors should feature a stable and reliable performance
  5. Filming should be easy and convenient
  6. Should be capable of handling high-temperature processing, high power and relatively wide application range. 

A Brief Introduction of Embedded PCBs

The first IC invented by Jack Kilby in 1959 contained only two transistors and a resistor. Nowadays, multiple complex techniques are applied to combine tens of millions of transistors into one single PC chip. With electronic products stepping towards miniaturization and multifunction, a type of embedded passive component technology occurred to meet the increasingly higher demands. The ratio between passive components and active components is approximately 20:1, density has been gradually going up with the ratio rising. With so many passive components embedded in PCBs, the area of an SMT circuit board shrinks by 40% compared to board fabricated through embedded technology.

To read this entire article, which appeared in the June 2017 issue of The PCB Design Magazine, click here.

 

Share

Print


Suggested Items

IPC Reliability Forum Wrap-up With Brook Sandy-Smith

08/12/2019 | Andy Shaughnessy, Design007 Magazine
I attended the recent IPC High-Reliability Forum and Microvia Summit in Baltimore, Maryland. The speakers and panelists focused on a variety of topics, but one issue that kept popping up was the failure of some microvias on military and aerospace PCBs. Fortunately, some smart technologists are focusing on determining the cause of these via failures. I asked Brook Sandy-Smith, IPC’s technical education program manager, to give us a quick wrap-up of this event.

Denny Fritz: The Difference Between Quality and Reliability

08/06/2019 | Andy Shaughnessy, Design007 Magazine
I recently spoke with industry veteran (and I-Connect007 columnist) Denny Fritz about the relationship between quality and reliability—two terms that are unequal but often used interchangeably. We also discuss the current state of lead-free solders in the U.S. military and defense market as well as the microvia reliability issues Denny focused on at IPC’s High-Reliability Forum and Microvia Summit in Baltimore, Maryland.

26 Meters of Flex!

07/25/2019 | I-Connect007 Editorial Team
Barry Matties spoke with Philip Johnston, managing director of Trackwise Designs, about the company’s patented length-unlimited multilayer printed circuits aimed at replacing conventional wire harnesses. Originally created for the aerospace industry, Trackwise has since seen growing interest from a number of different industries. Jake Kelly, managing director and chairman of Viking Test Ltd., also joined the conversation to discuss the importance of having a flexible equipment supplier when dealing with such a unique technology.



Copyright © 2019 I-Connect007. All rights reserved.