A 5×80W 0.004% THD+N automotive multiphase Class-D audio amplifier with integrated low-latency ΔΣ ADCs for digitized feedback after the output filter

Fred Mostert, Daniel Schinkel, Wouter Groothedde, Lucien Breems, Remko van Heeswijk, Marto Jan Koerts, Eric Van Iersel, Daniel Groeneveld, Gertjan van Holland, Patrick Zeelen, Derk Jan Hissink, Martin Pos, Paul Wielage, Fre Jorritsma, Marc Klein Middelink

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Citations (Scopus)

Abstract

Feedback after the output filter has long been a desired feature for high-power switching (Class-D) amplifiers, as it mitigates the influence of the LC filter components on the frequency transfer function and on linearity, enabling lower component costs. However, it requires compensation of the LC filter to maintain loop stability. In the analog domain, this is difficult to combine with high loop-gain, as the design has to cope with variability in both the LC filter and in the loop-filter. In [1], multiple analog feedback loop-filters from before and after the output filter have been employed, but the loop-gain of the outer loop is only ∼10dB at 20kHz. Alternatively, digital filters have no variability in their coefficients and are well suited for programmable compensation of the output filter, optionally even adaptive. In [2] feasibility is shown of a single digital loop with full global feedback. However, to achieve this, a costly commercially available ADC with 2.5MHz bandwidth and 950mW power consumption was required, a drawback that so far has prevented further adoption. In this paper we present a 5-channel Class-D amplifier with integrated low-latency delta-sigma (ΔΣ) ADCs, each consuming only 30mW, for digital feedback after the output filter. With this system, more than 50dB loop-gain is obtained. THD+N is 0.004% over the full audio band, which is at least 10× better than [1] where data is only given at 1kHz.

LanguageEnglish
Title of host publication2017 IEEE International Solid-State Circuits Conference, ISSCC 2017
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages86-87
Number of pages2
ISBN (Electronic)9781509037575
DOIs
StatePublished - 2 Mar 2017
Event64th IEEE International Solid-State Circuits Conference (ISSCC 2017) - San Francisco, United States
Duration: 5 Feb 20179 Feb 2017
Conference number: 61

Conference

Conference64th IEEE International Solid-State Circuits Conference (ISSCC 2017)
Abbreviated titleISSCC 2017
CountryUnited States
CitySan Francisco
Period5/02/179/02/17

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Feedback
Digital filters
Probability density function
Transfer functions
Electric power utilization
Bandwidth
Costs
Compensation and Redress

Cite this

Mostert, F., Schinkel, D., Groothedde, W., Breems, L., van Heeswijk, R., Koerts, M. J., ... Middelink, M. K. (2017). A 5×80W 0.004% THD+N automotive multiphase Class-D audio amplifier with integrated low-latency ΔΣ ADCs for digitized feedback after the output filter. In 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017 (pp. 86-87). [7870273] Piscataway: Institute of Electrical and Electronics Engineers. DOI: 10.1109/ISSCC.2017.7870273
Mostert, Fred ; Schinkel, Daniel ; Groothedde, Wouter ; Breems, Lucien ; van Heeswijk, Remko ; Koerts, Marto Jan ; Van Iersel, Eric ; Groeneveld, Daniel ; van Holland, Gertjan ; Zeelen, Patrick ; Hissink, Derk Jan ; Pos, Martin ; Wielage, Paul ; Jorritsma, Fre ; Middelink, Marc Klein. / A 5×80W 0.004% THD+N automotive multiphase Class-D audio amplifier with integrated low-latency ΔΣ ADCs for digitized feedback after the output filter. 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. Piscataway : Institute of Electrical and Electronics Engineers, 2017. pp. 86-87
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title = "A 5×80W 0.004{\%} THD+N automotive multiphase Class-D audio amplifier with integrated low-latency ΔΣ ADCs for digitized feedback after the output filter",
abstract = "Feedback after the output filter has long been a desired feature for high-power switching (Class-D) amplifiers, as it mitigates the influence of the LC filter components on the frequency transfer function and on linearity, enabling lower component costs. However, it requires compensation of the LC filter to maintain loop stability. In the analog domain, this is difficult to combine with high loop-gain, as the design has to cope with variability in both the LC filter and in the loop-filter. In [1], multiple analog feedback loop-filters from before and after the output filter have been employed, but the loop-gain of the outer loop is only ∼10dB at 20kHz. Alternatively, digital filters have no variability in their coefficients and are well suited for programmable compensation of the output filter, optionally even adaptive. In [2] feasibility is shown of a single digital loop with full global feedback. However, to achieve this, a costly commercially available ADC with 2.5MHz bandwidth and 950mW power consumption was required, a drawback that so far has prevented further adoption. In this paper we present a 5-channel Class-D amplifier with integrated low-latency delta-sigma (ΔΣ) ADCs, each consuming only 30mW, for digital feedback after the output filter. With this system, more than 50dB loop-gain is obtained. THD+N is 0.004{\%} over the full audio band, which is at least 10× better than [1] where data is only given at 1kHz.",
author = "Fred Mostert and Daniel Schinkel and Wouter Groothedde and Lucien Breems and {van Heeswijk}, Remko and Koerts, {Marto Jan} and {Van Iersel}, Eric and Daniel Groeneveld and {van Holland}, Gertjan and Patrick Zeelen and Hissink, {Derk Jan} and Martin Pos and Paul Wielage and Fre Jorritsma and Middelink, {Marc Klein}",
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doi = "10.1109/ISSCC.2017.7870273",
language = "English",
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Mostert, F, Schinkel, D, Groothedde, W, Breems, L, van Heeswijk, R, Koerts, MJ, Van Iersel, E, Groeneveld, D, van Holland, G, Zeelen, P, Hissink, DJ, Pos, M, Wielage, P, Jorritsma, F & Middelink, MK 2017, A 5×80W 0.004% THD+N automotive multiphase Class-D audio amplifier with integrated low-latency ΔΣ ADCs for digitized feedback after the output filter. in 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017., 7870273, Institute of Electrical and Electronics Engineers, Piscataway, pp. 86-87, 64th IEEE International Solid-State Circuits Conference (ISSCC 2017), San Francisco, United States, 5/02/17. DOI: 10.1109/ISSCC.2017.7870273

A 5×80W 0.004% THD+N automotive multiphase Class-D audio amplifier with integrated low-latency ΔΣ ADCs for digitized feedback after the output filter. / Mostert, Fred; Schinkel, Daniel; Groothedde, Wouter; Breems, Lucien; van Heeswijk, Remko; Koerts, Marto Jan; Van Iersel, Eric; Groeneveld, Daniel; van Holland, Gertjan; Zeelen, Patrick; Hissink, Derk Jan; Pos, Martin; Wielage, Paul; Jorritsma, Fre; Middelink, Marc Klein.

2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. Piscataway : Institute of Electrical and Electronics Engineers, 2017. p. 86-87 7870273.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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AU - Mostert,Fred

AU - Schinkel,Daniel

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AU - Koerts,Marto Jan

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AU - Zeelen,Patrick

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N2 - Feedback after the output filter has long been a desired feature for high-power switching (Class-D) amplifiers, as it mitigates the influence of the LC filter components on the frequency transfer function and on linearity, enabling lower component costs. However, it requires compensation of the LC filter to maintain loop stability. In the analog domain, this is difficult to combine with high loop-gain, as the design has to cope with variability in both the LC filter and in the loop-filter. In [1], multiple analog feedback loop-filters from before and after the output filter have been employed, but the loop-gain of the outer loop is only ∼10dB at 20kHz. Alternatively, digital filters have no variability in their coefficients and are well suited for programmable compensation of the output filter, optionally even adaptive. In [2] feasibility is shown of a single digital loop with full global feedback. However, to achieve this, a costly commercially available ADC with 2.5MHz bandwidth and 950mW power consumption was required, a drawback that so far has prevented further adoption. In this paper we present a 5-channel Class-D amplifier with integrated low-latency delta-sigma (ΔΣ) ADCs, each consuming only 30mW, for digital feedback after the output filter. With this system, more than 50dB loop-gain is obtained. THD+N is 0.004% over the full audio band, which is at least 10× better than [1] where data is only given at 1kHz.

AB - Feedback after the output filter has long been a desired feature for high-power switching (Class-D) amplifiers, as it mitigates the influence of the LC filter components on the frequency transfer function and on linearity, enabling lower component costs. However, it requires compensation of the LC filter to maintain loop stability. In the analog domain, this is difficult to combine with high loop-gain, as the design has to cope with variability in both the LC filter and in the loop-filter. In [1], multiple analog feedback loop-filters from before and after the output filter have been employed, but the loop-gain of the outer loop is only ∼10dB at 20kHz. Alternatively, digital filters have no variability in their coefficients and are well suited for programmable compensation of the output filter, optionally even adaptive. In [2] feasibility is shown of a single digital loop with full global feedback. However, to achieve this, a costly commercially available ADC with 2.5MHz bandwidth and 950mW power consumption was required, a drawback that so far has prevented further adoption. In this paper we present a 5-channel Class-D amplifier with integrated low-latency delta-sigma (ΔΣ) ADCs, each consuming only 30mW, for digital feedback after the output filter. With this system, more than 50dB loop-gain is obtained. THD+N is 0.004% over the full audio band, which is at least 10× better than [1] where data is only given at 1kHz.

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Mostert F, Schinkel D, Groothedde W, Breems L, van Heeswijk R, Koerts MJ et al. A 5×80W 0.004% THD+N automotive multiphase Class-D audio amplifier with integrated low-latency ΔΣ ADCs for digitized feedback after the output filter. In 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. Piscataway: Institute of Electrical and Electronics Engineers. 2017. p. 86-87. 7870273. Available from, DOI: 10.1109/ISSCC.2017.7870273