A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator

Shang Hsien Yang; Yen Ting Lin; Yu Sheng Ma; Hung Wei Chen; Ke-Horng Chen; Chin Long Wey; Ying Hsi Lin; Shian Ru Lin; Tsung Yen Tsai

doi:10.1109/ISSCC.2017.7870248

A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator

Shang Hsien Yang, Yen Ting Lin, Yu Sheng Ma, Hung Wei Chen, Ke-Horng Chen, Chin Long Wey, Ying Hsi Lin, Shian Ru Lin, Tsung Yen Tsai

Department of Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

8 Scopus citations

Abstract

RF-PAs in 4G LTE mobile devices handle modulated signals with high peak-to-average power ratios (PAPRs) while maintaining linearity and power efficiency. Envelope-tracking technology increases the efficiency of an RF-PA by modulating its supply voltage proportionally to the RF signals. The function of an envelope-tracking supply modulator (ETSM) is to track the envelope information and provide the same output voltage to the RF-PA. Figure 2.3.1 shows a conventional hybrid ETSM, which is comprised of a linear amplifier (LA) and a hysteresis-controlled switching regulator (SWR). Since the ETSM is mainly battery-powered, an additional SWR is required. This paper presents a single-inductor dual-output (SIDO) converter that removes both SWRs, as illustrated in Fig. 2.3.2, to speed up the performance of the ETSM. In the past, a cross-regulation (CR) effect was recognized as one the most critical drawbacks in the conventional design with single-inductor multiple-output (SIMO) converters, and numerous research papers have attempted to suppress CR [1,2]. In this paper, however, the proposed ETSM design, driven by the LA, makes effective use of the CR effect for achieving faster and efficient envelope tracking. Results show that, at a switching frequency of 2MHz, the proposed ETSM can deliver up to 2W of average output power with an efficiency of 82%.

Original language	English
Title of host publication	2017 IEEE International Solid-State Circuits Conference, ISSCC 2017
Editors	Laura C. Fujino
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	36-37
Number of pages	2
ISBN (Electronic)	9781509037575
DOIs	https://doi.org/10.1109/ISSCC.2017.7870248
State	Published - 2 Mar 2017
Event	64th IEEE International Solid-State Circuits Conference, ISSCC 2017 - San Francisco, United States Duration: 5 Feb 2017 → 9 Feb 2017

Publication series

Name	Digest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume	60
ISSN (Print)	0193-6530

Conference

Conference	64th IEEE International Solid-State Circuits Conference, ISSCC 2017
Country	United States
City	San Francisco
Period	5/02/17 → 9/02/17

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10.1109/ISSCC.2017.7870248

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Yang, S. H., Lin, Y. T., Ma, Y. S., Chen, H. W., Chen, K-H., Wey, C. L., Lin, Y. H., Lin, S. R., & Tsai, T. Y. (2017). A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator. In L. C. Fujino (Ed.), 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017 (pp. 36-37). [7870248] (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; Vol. 60). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISSCC.2017.7870248

Yang, Shang Hsien ; Lin, Yen Ting ; Ma, Yu Sheng ; Chen, Hung Wei ; Chen, Ke-Horng ; Wey, Chin Long ; Lin, Ying Hsi ; Lin, Shian Ru ; Tsai, Tsung Yen. / A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator. 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. editor / Laura C. Fujino. Institute of Electrical and Electronics Engineers Inc., 2017. pp. 36-37 (Digest of Technical Papers - IEEE International Solid-State Circuits Conference).

@inproceedings{47c5ff8b456e415f82cde8a91c95375c,

title = "A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator",

abstract = "RF-PAs in 4G LTE mobile devices handle modulated signals with high peak-to-average power ratios (PAPRs) while maintaining linearity and power efficiency. Envelope-tracking technology increases the efficiency of an RF-PA by modulating its supply voltage proportionally to the RF signals. The function of an envelope-tracking supply modulator (ETSM) is to track the envelope information and provide the same output voltage to the RF-PA. Figure 2.3.1 shows a conventional hybrid ETSM, which is comprised of a linear amplifier (LA) and a hysteresis-controlled switching regulator (SWR). Since the ETSM is mainly battery-powered, an additional SWR is required. This paper presents a single-inductor dual-output (SIDO) converter that removes both SWRs, as illustrated in Fig. 2.3.2, to speed up the performance of the ETSM. In the past, a cross-regulation (CR) effect was recognized as one the most critical drawbacks in the conventional design with single-inductor multiple-output (SIMO) converters, and numerous research papers have attempted to suppress CR [1,2]. In this paper, however, the proposed ETSM design, driven by the LA, makes effective use of the CR effect for achieving faster and efficient envelope tracking. Results show that, at a switching frequency of 2MHz, the proposed ETSM can deliver up to 2W of average output power with an efficiency of 82%.",

author = "Yang, {Shang Hsien} and Lin, {Yen Ting} and Ma, {Yu Sheng} and Chen, {Hung Wei} and Ke-Horng Chen and Wey, {Chin Long} and Lin, {Ying Hsi} and Lin, {Shian Ru} and Tsai, {Tsung Yen}",

year = "2017",

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doi = "10.1109/ISSCC.2017.7870248",

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Yang, SH, Lin, YT, Ma, YS, Chen, HW, Chen, K-H, Wey, CL, Lin, YH, Lin, SR & Tsai, TY 2017, A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator. in LC Fujino (ed.), 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017., 7870248, Digest of Technical Papers - IEEE International Solid-State Circuits Conference, vol. 60, Institute of Electrical and Electronics Engineers Inc., pp. 36-37, 64th IEEE International Solid-State Circuits Conference, ISSCC 2017, San Francisco, United States, 5/02/17. https://doi.org/10.1109/ISSCC.2017.7870248

A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator. / Yang, Shang Hsien; Lin, Yen Ting; Ma, Yu Sheng; Chen, Hung Wei; Chen, Ke-Horng; Wey, Chin Long; Lin, Ying Hsi; Lin, Shian Ru; Tsai, Tsung Yen.

2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. ed. / Laura C. Fujino. Institute of Electrical and Electronics Engineers Inc., 2017. p. 36-37 7870248 (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; Vol. 60).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Yang, Shang Hsien

AU - Lin, Yen Ting

AU - Ma, Yu Sheng

AU - Chen, Hung Wei

AU - Chen, Ke-Horng

AU - Wey, Chin Long

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AU - Lin, Shian Ru

AU - Tsai, Tsung Yen

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N2 - RF-PAs in 4G LTE mobile devices handle modulated signals with high peak-to-average power ratios (PAPRs) while maintaining linearity and power efficiency. Envelope-tracking technology increases the efficiency of an RF-PA by modulating its supply voltage proportionally to the RF signals. The function of an envelope-tracking supply modulator (ETSM) is to track the envelope information and provide the same output voltage to the RF-PA. Figure 2.3.1 shows a conventional hybrid ETSM, which is comprised of a linear amplifier (LA) and a hysteresis-controlled switching regulator (SWR). Since the ETSM is mainly battery-powered, an additional SWR is required. This paper presents a single-inductor dual-output (SIDO) converter that removes both SWRs, as illustrated in Fig. 2.3.2, to speed up the performance of the ETSM. In the past, a cross-regulation (CR) effect was recognized as one the most critical drawbacks in the conventional design with single-inductor multiple-output (SIMO) converters, and numerous research papers have attempted to suppress CR [1,2]. In this paper, however, the proposed ETSM design, driven by the LA, makes effective use of the CR effect for achieving faster and efficient envelope tracking. Results show that, at a switching frequency of 2MHz, the proposed ETSM can deliver up to 2W of average output power with an efficiency of 82%.

AB - RF-PAs in 4G LTE mobile devices handle modulated signals with high peak-to-average power ratios (PAPRs) while maintaining linearity and power efficiency. Envelope-tracking technology increases the efficiency of an RF-PA by modulating its supply voltage proportionally to the RF signals. The function of an envelope-tracking supply modulator (ETSM) is to track the envelope information and provide the same output voltage to the RF-PA. Figure 2.3.1 shows a conventional hybrid ETSM, which is comprised of a linear amplifier (LA) and a hysteresis-controlled switching regulator (SWR). Since the ETSM is mainly battery-powered, an additional SWR is required. This paper presents a single-inductor dual-output (SIDO) converter that removes both SWRs, as illustrated in Fig. 2.3.2, to speed up the performance of the ETSM. In the past, a cross-regulation (CR) effect was recognized as one the most critical drawbacks in the conventional design with single-inductor multiple-output (SIMO) converters, and numerous research papers have attempted to suppress CR [1,2]. In this paper, however, the proposed ETSM design, driven by the LA, makes effective use of the CR effect for achieving faster and efficient envelope tracking. Results show that, at a switching frequency of 2MHz, the proposed ETSM can deliver up to 2W of average output power with an efficiency of 82%.

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Yang SH, Lin YT, Ma YS, Chen HW, Chen K-H, Wey CL et al. A single-inductor dual-output converter with linear-amplifier-driven cross regulation for prioritized energy-distribution control of envelope-tracking supply modulator. In Fujino LC, editor, 2017 IEEE International Solid-State Circuits Conference, ISSCC 2017. Institute of Electrical and Electronics Engineers Inc. 2017. p. 36-37. 7870248. (Digest of Technical Papers - IEEE International Solid-State Circuits Conference). https://doi.org/10.1109/ISSCC.2017.7870248