Varactor-Based Passive Ripple Filter with Automatic Tuning for Low-Noise Power-Supply Systems

Patrick J. Meehan; Donal O'Sullivan; Aldrick S. Limjoco; Pat McGuinness; James Jasper MacAsaet; Jefferson A. Eco; Thomas Conway

doi:10.1109/TPEL.2016.2598639

Varactor-Based Passive Ripple Filter with Automatic Tuning for Low-Noise Power-Supply Systems

Patrick J. Meehan, Donal O'Sullivan, Aldrick S. Limjoco, Pat McGuinness, James Jasper MacAsaet, Jefferson A. Eco, Thomas Conway

Department of Electronics & Computer Engineering

Analog Devices, Inc.

Research output: Contribution to journal › Article › peer-review

Abstract

Use of parallel resonance to notch filter the fundamental ripple frequency on a switching regulator output offers advantages in the combined metric of size and power compared to traditional low-pass solutions. Availability of barium strontium titanate varactors with capacitance of several nanofarads now makes automatic tuning of parallel resonance alignment with the ripple fundamental a feasible alternative. A phase-lock automatic-tuning circuit is demonstrated. The effective use of this technique as the power-supply filter used to power a 16 bit ADC is shown. The suitability of the resulting filter and regulator to full surface mount encapsulation is demonstrated.

Original language	English
Article number	7536117
Pages (from-to)	4741-4752
Number of pages	12
Journal	IEEE Transactions on Power Electronics
Volume	32
Issue number	6
DOIs	https://doi.org/10.1109/TPEL.2016.2598639
Publication status	Published - Jun 2017

Keywords

Auto-tuned circuit
barium strontium titanate
buck regulators
dc-dc power converters
parallel resonance
passive filter
ripple reduction
switched-mode power supply
tank filter
tuned-filter
varactor

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10.1109/TPEL.2016.2598639

Cite this

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title = "Varactor-Based Passive Ripple Filter with Automatic Tuning for Low-Noise Power-Supply Systems",

abstract = "Use of parallel resonance to notch filter the fundamental ripple frequency on a switching regulator output offers advantages in the combined metric of size and power compared to traditional low-pass solutions. Availability of barium strontium titanate varactors with capacitance of several nanofarads now makes automatic tuning of parallel resonance alignment with the ripple fundamental a feasible alternative. A phase-lock automatic-tuning circuit is demonstrated. The effective use of this technique as the power-supply filter used to power a 16 bit ADC is shown. The suitability of the resulting filter and regulator to full surface mount encapsulation is demonstrated.",

keywords = "Auto-tuned circuit, barium strontium titanate, buck regulators, dc-dc power converters, parallel resonance, passive filter, ripple reduction, switched-mode power supply, tank filter, tuned-filter, varactor",

author = "Meehan, {Patrick J.} and Donal O'Sullivan and Limjoco, {Aldrick S.} and Pat McGuinness and MacAsaet, {James Jasper} and Eco, {Jefferson A.} and Thomas Conway",

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year = "2017",

month = jun,

doi = "10.1109/TPEL.2016.2598639",

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AU - McGuinness, Pat

AU - MacAsaet, James Jasper

AU - Eco, Jefferson A.

AU - Conway, Thomas

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AB - Use of parallel resonance to notch filter the fundamental ripple frequency on a switching regulator output offers advantages in the combined metric of size and power compared to traditional low-pass solutions. Availability of barium strontium titanate varactors with capacitance of several nanofarads now makes automatic tuning of parallel resonance alignment with the ripple fundamental a feasible alternative. A phase-lock automatic-tuning circuit is demonstrated. The effective use of this technique as the power-supply filter used to power a 16 bit ADC is shown. The suitability of the resulting filter and regulator to full surface mount encapsulation is demonstrated.

KW - Auto-tuned circuit

KW - barium strontium titanate

KW - buck regulators

KW - dc-dc power converters

KW - parallel resonance

KW - passive filter

KW - ripple reduction

KW - switched-mode power supply

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Varactor-Based Passive Ripple Filter with Automatic Tuning for Low-Noise Power-Supply Systems

Abstract

Keywords

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