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      PASSIVE COMPONENTS Keys to Enabling Advanced Future System Designs

      August 26, 2022
      Reading Time: 10 mins read
      123 1
      A A

      by Ron Demcko AVX Corporation Fellow, USA

      presented by R.Demcko at the 2nd PCNS 10-13th September 2019, Bucharest, Romania as Keynote 1 and rated by PCNS attendees as the best Keynote presentation

      Abstract

      In the past, system power budgets and data/operating speeds were wide and slow respectively. This allowed passive component selection and consideration to occur at the end of the design cycle. Today in the digital world, emerging single chip semiconductors now have enough processing power to become a real time – reconfigurable end system. 

      These ICs that have extreme needs when it comes to power integrity, peak power stability and thermal environments. Similar cases exist in the RF world with high power designs based upon GaAs & GaN. Cases will be shown that prove the importance of passives in order to optimize the active component performance. A correlation between the level of technology that the passive must exhibit and IC type are discussed by IC type. End systems within the transport and harsh environment sector and cases are shown which reinforce passive component importance to system performance.

      Advancement of Capacitance Technology

      In 1746, the Leyden Jarwas considered to be the very first capacitor. It was the first device capable of storing an electric charge. Since that capacitors developed into fascinating components capable to cover 17 ranges ! of capacitance values from sub volt to hundred thousands of volts. See Fig.1 of the current capacitance vs voltage overview of mass volume capacitor technologies.

      Fig.1. Mass volume capacitor technologies capacitance vs voltage overview chart. modified from source:EPCI

      In 2019 we have experienced some shortage of some components such as MLCC capacitors or resistors and market conditions unlike anything we have seen before.

      Fig.2. Cycling nature of capacitors shortages, source: modified from Paumanok Publications

      SUPPLY SHORTAGE IMPACTS

      Design Engineers were driven to align usage with parts readily available – compromises made

      Designers & IC Fabs Now:

      • Exploring Design Changes to Reduce Component Count
      • Increased Collaboration in New IC Types Causing Accelerated Innovation / Rate of Change

      The next 10 years will be nothing like anything we have seen. Massive new markets and application needs is one of current drivers. We are in human era of fast adoption of digital based services and hardware development in areas such as:

      • Virtual Reality / Augmented Reality
      • EVs
      • Autonomous Vehicles
      • 5G
      • IoT Cloud

      Lets dive into two sectors: IoT

      • Smartphones/ PDA
      • Charging – Wireless Low Power &
      • Wired High Power
      • Medical Electronics
      • Advanced Robotics
      Fig.3. IoT potential economic impact; Source: McKinsey Global Institute Analysis

      Example of passive components involvement: Advances in semiconductor technologies is one of the strong driver that enables fast IoT, wearables, energy harvesting development etc. However, its use in real applications would not be possible without development of enabling capacitor technologies.

      Fig.4. Semiconductor density development trend; source: Intel
      Fig.5. Enabling capacitor technologies; source: AVX

      Fig.4. shows trends in semiconductor density development. Semiconductor die scaling is however also associated with IC voltage drop as shown on Fig.6. that makes direct impact to:

      • Capacitors job decoupling more critical
      • Clock & data speeds making di/dt drawn larger
      Fig. 6. semiconductor supply voltage decrease and on chop local clock increase trend; source: ITRS

      Fig.7. and 8. illustrate the concrete example of Maxim FPGA system architecture and Xilinx Virtex-7 power supply requirements.

      Fig.7. Example of Maxim FPGA system architecture
      Fig.8. Xillinx Virtex 7 power supplies requirements; source: Maxim

      Such requirements are calling for a low inductance, high frequency decoupling solution. The actual solution today is based either on low inductance MLCC types or small case size MLCCs in low inductance configuration using a 0402 Caps Inside 0.8 mm Pitch BGA or 0201 Caps Placed 90° Rotated Allows For More Caps Underneath The BGA Area as shown in Fig.9. Fig.10. shows an example of low impedance LGA MLCC capacitor construction.

      and Fig.10.

      Fig.9. Low inductance small size MLCC IC decoupling; source: Maxim, Intel

      Fig.10. Low inductance MLCC capacitors; source: AVX

      IoT is thus one of the current and future application where capacitors enables the further growth and performance improvements. The growth of IoT in 2019 will reach 18 billion USD according to Ericsson, or 37 billion per Statista with further growth to 75 billion USD in 2025. The number of connected devices will exceed 75 Billion by 2025 according to Cisco – see Fig.11.

      Fig.11. Number of IoT connected devices; source: Cisco

      With such IoT growth forecast IoT is becoming the major driver of passive component volumes in near future. One of the IoT challenges is its energy independence from the main power networking relying on batteries or a other energy sources using its potential to 24/7 remote monitoring of anything. Batteries are often non-practical solution from small wearables to large wind power generators with difficult & expensive maintenance. Thus IoT will also drive energy harvesting methods, circuits & modules and a local storage technologies such as capacitors.

      Fig.12. Simplified IoT stamp profile
      Fig.13. IoT integration

      Cost pressures and downsizing are driving further IoT integration with miniaturization requirements for all components. Power energy harvesting will need advancements in energy storage components – from on-chip nano-dimensions to high power large systems. The storage solutions will have to feature parameters such as:

      • low leakage current
      • high storage capability (high capacitance value)
      • sufficient energy and power density

      Optimum storage component selection guide may differ with actual applications and it can be based on capacitor, hybrid capacitor/battery or pure battery technologies. See Fig. 14 for current energy storage technologies overview.

      Fig. 14. Current energy storage density vs power density technologies overview

      So, what are the energy storage component power of the future requirements?

      • Small, Light, Cheap
      • High Performance
      • High Life Cycles
      • Reliable
      • Billions Made

      Current & Future Capacitors Applications

      Electric Vehicles

      Today electrical vehicles consist of massive content of >10,000 capacitors. The application range includes from RF to Power Capacitors including special requirements for high temperature 150C/175C, decoupling & AC coupling on ADAS Drive (critical for safety) or wireless charge circuitry in cabin entertainment systems.

      A specific new challenges of electrical versus classical combustion engine vehicles includes:

      • Plug in charger & DC drive filtering
      • DC Link Caps
      • EMI Filter Caps
      • Safety Caps


      Fig.15. HEV/EV traction chain with capacitor requirements

      Table 1. shows comparison between film and electrolytic capacitors versus the power application typical parameter requirements.

      Table 1. Film vs electrolytics benchmark in power applications

      Power applications general needs:

      • More Cap
      • Higher Voltages
      • Smaller & Lighter Packages
      • Operation At Higher Temperatures 

      Where are we going & what does the future hold ?

      The current capacitor mass market technology positions and application domains are summarized in Fig.16. and Table 2. below.

      Fig.16. Capacitor technology technology domains and requirements roadmap
      Table 2. Capacitor parameter requirements versus application type

      Increase integration and downsizing has resulted in ICs evolution towards System-on-chip (SoC) and System-in-package (SiP) solutions. This trend is also associated with increase of power quality needs. Chart in Figure 17. is illustrating the trend of semiconductor miniaturization and diversification into creation of higher value systems for the future.

      Fig. 17. Beyond CMOS miniaturization and diversification trends

      Example of such integration in evolution of component integration in SoC/SiP is shown in Fig. 18.

      Fig.18. Component integration evolution example; source: Intel, Texas Instruments, IBM

      Summary

      We are living in fascinating time entering digital era of human society. The fast growth of technologies and services enabled by digital electronics drive us to the future with unimaginable upsides.

      We have seen currently some component shortages that has been a challenge for the existing supply chains. Nevertheless, on the other hand the shortages also drive the design innovation and novel solutions.

      Passive components and especially capacitors are part of the challenge for future electronics. Need for efficient capacitors is growing.

      The capacitor technology evolution is driven by the three major drivers:

      1. Semiconductor IC Demands
      2. New Applications
      3. Emerging Active/Passive Packages

      more 2nd PCNS symposium technical papers can be viewed and downloaded in pdf from EPCI Academy e-Proceedings:

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