A two-phase switching hybrid supply modulator for polar transmitters with 9% efficiency improvement

Ying Wu; Philip K T Mok

doi:10.1109/ISSCC.2010.5433989

A two-phase switching hybrid supply modulator for polar transmitters with 9% efficiency improvement

Ying Wu^*, Philip K T Mok

^*Corresponding author for this work

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

6 Scopus citations

Abstract

Emerging polar transmitters for highly efficient and linear power amplifiers (PAs) demand for high-efficiency, high-bandwidth and low-ripple supply modulators. In [1], a linear regulator is used; however, its efficiency is low at low power levels. A switched-mode power supply (SMPS) is used in [2]; but the high switching loss due to high switching frequency (necessary for high bandwidth) limits the maximum efficiency to ∼76%. A hybrid amplifier (HA) topology combining both linear amplifier (LA) and switching amplifier (SA) is used in some recent work [3, 4]. In this topology, a high-bandwidth LA replicates the input envelope voltage V_in at its output V _o; while the high-efficiency SA supplies most of the load current within its bandwidth. Yet, the tracking bandwidth is finite in [3]; and the LA in [4] needs to supply most of the high-frequency load current due to the exceptionally large inductor (20μH) used for realizing small output ripple; and therefore, limiting the dynamic efficiency. Figure 10.1.1 shows the proposed wideband HA featuring two-phase switching (2PHSW) for reducing ripple and improving static efficiency, and a feedforward bandpass filter (FF-BBF) for enhancing dynamic efficiency.

Original language	English (US)
Title of host publication	2010 IEEE International Solid-State Circuits Conference, ISSCC 2010 - Digest of Technical Papers
Pages	196-197
Number of pages	2
Volume	53
DOIs	https://doi.org/10.1109/ISSCC.2010.5433989
State	Published - 2010
Externally published	Yes
Event	2010 IEEE International Solid-State Circuits Conference, ISSCC 2010 - San Francisco, CA, United States Duration: Feb 7 2010 → Feb 11 2010

Other

Other	2010 IEEE International Solid-State Circuits Conference, ISSCC 2010
Country/Territory	United States
City	San Francisco, CA
Period	02/7/10 → 02/11/10

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/ISSCC.2010.5433989

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title = "A two-phase switching hybrid supply modulator for polar transmitters with 9% efficiency improvement",

abstract = "Emerging polar transmitters for highly efficient and linear power amplifiers (PAs) demand for high-efficiency, high-bandwidth and low-ripple supply modulators. In [1], a linear regulator is used; however, its efficiency is low at low power levels. A switched-mode power supply (SMPS) is used in [2]; but the high switching loss due to high switching frequency (necessary for high bandwidth) limits the maximum efficiency to ∼76%. A hybrid amplifier (HA) topology combining both linear amplifier (LA) and switching amplifier (SA) is used in some recent work [3, 4]. In this topology, a high-bandwidth LA replicates the input envelope voltage Vin at its output V o; while the high-efficiency SA supplies most of the load current within its bandwidth. Yet, the tracking bandwidth is finite in [3]; and the LA in [4] needs to supply most of the high-frequency load current due to the exceptionally large inductor (20μH) used for realizing small output ripple; and therefore, limiting the dynamic efficiency. Figure 10.1.1 shows the proposed wideband HA featuring two-phase switching (2PHSW) for reducing ripple and improving static efficiency, and a feedforward bandpass filter (FF-BBF) for enhancing dynamic efficiency.",

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language = "English (US)",

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Wu, Y & Mok, PKT 2010, A two-phase switching hybrid supply modulator for polar transmitters with 9% efficiency improvement. in 2010 IEEE International Solid-State Circuits Conference, ISSCC 2010 - Digest of Technical Papers. vol. 53, 5433989, pp. 196-197, 2010 IEEE International Solid-State Circuits Conference, ISSCC 2010, San Francisco, CA, United States, 02/7/10. https://doi.org/10.1109/ISSCC.2010.5433989

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AU - Mok, Philip K T

PY - 2010

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AB - Emerging polar transmitters for highly efficient and linear power amplifiers (PAs) demand for high-efficiency, high-bandwidth and low-ripple supply modulators. In [1], a linear regulator is used; however, its efficiency is low at low power levels. A switched-mode power supply (SMPS) is used in [2]; but the high switching loss due to high switching frequency (necessary for high bandwidth) limits the maximum efficiency to ∼76%. A hybrid amplifier (HA) topology combining both linear amplifier (LA) and switching amplifier (SA) is used in some recent work [3, 4]. In this topology, a high-bandwidth LA replicates the input envelope voltage Vin at its output V o; while the high-efficiency SA supplies most of the load current within its bandwidth. Yet, the tracking bandwidth is finite in [3]; and the LA in [4] needs to supply most of the high-frequency load current due to the exceptionally large inductor (20μH) used for realizing small output ripple; and therefore, limiting the dynamic efficiency. Figure 10.1.1 shows the proposed wideband HA featuring two-phase switching (2PHSW) for reducing ripple and improving static efficiency, and a feedforward bandpass filter (FF-BBF) for enhancing dynamic efficiency.

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BT - 2010 IEEE International Solid-State Circuits Conference, ISSCC 2010 - Digest of Technical Papers

T2 - 2010 IEEE International Solid-State Circuits Conference, ISSCC 2010

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ER -

A two-phase switching hybrid supply modulator for polar transmitters with 9% efficiency improvement

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