An Active EMI Cancellation Technique Achieving a 25-dB Reduction in Conducted EMI of LIN Drivers

Abhishek Ray, Raveesh Magod, Bhushan Talele, Shashank Alevoor, Terry Mayhugh, Bertan Bakkaloglu

Research output: Contribution to journalArticlepeer-review

Abstract

Robustness to electromagnetic interference (EMI) is one of the primary design aspects of state of the art automotive ICs like System Basis Chips (SBCs) which provide a wide range of analog, power regulation and digital functions on the same die. One of the primary sources of conducted EMI on the Local Interconnect Network (LIN) driver output is an integrated switching DC-DC regulator noise coupling through the parasitic substrate capacitance of the SBC. In this paper an adaptive active EMI cancellation technique to cancel the switching noise of the DC-DC regulator on the LIN driver output to ensure electromagnetic compatibility (EMC) is presented. The proposed active EMI cancellation circuit synthesizes a phase synchronized cancellation pulse which is then injected onto the LIN driver output using an on-chip tunable capacitor array to cancel the switching noise injected via substrate. The proposed EMI reduction technique can track and cancel substrate noise independent of process technology and device parasitics, input voltage, duty cycle and loading conditions of the DC-DC switching regulator. The EMI cancellation system is designed and fabricated on a 180nm Bipolar-CMOS-DMOS (BCD) process with an integrated power stage of a DC-DC buck regulator at a switching frequency of 2MHz along with an automotive LIN driver. The EMI cancellation circuit occupies an area of 0.7 mm<inline-formula> <tex-math notation="LaTeX">$^{2}$</tex-math> </inline-formula>, which is less than 3% of the overall area in a standard SBC and consumes 12.5 mW of power and achieves 25 dB reduction of conducted EMI in the LIN driver output&#x2019;s power spectrum at the switching frequency and its harmonics.

Original languageEnglish (US)
Pages (from-to)1-12
Number of pages12
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
DOIs
StateAccepted/In press - 2022

Keywords

  • Couplings
  • electromagnetic compatibility
  • Electromagnetic compatibility
  • Electromagnetic interference
  • Electromagnetic interference
  • LIN driver
  • Regulators
  • substrate coupling
  • Substrates
  • Switches
  • switching noise
  • system basis chip (SBC)
  • Vehicles

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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