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

2010 IEEE International Solid-State Circuits Conference - (ISSCC) Pub Date : 2010-03-18 DOI:10.1109/ISSCC.2010.5433989

Ying Wu, P. Mok

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引用次数: 8

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 Vo; 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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一种用于极性发射机的两相开关混合电源调制器，效率提高9%

用于高效率和线性功率放大器(PAs)的新兴极性发射机需要高效率、高带宽和低纹波电源调制器。在[1]中，使用线性调节器;然而，在低功率水平下，其效率很低。[2]采用开关模式电源(SMPS);但是由于高开关频率(高带宽所必需的)导致的高开关损耗将最大效率限制在约76%。混合放大器(HA)拓扑结合了线性放大器(LA)和开关放大器(SA)在最近的一些工作中被使用[3,4]。在该拓扑中，高带宽LA在其输出Vo处复制输入包络电压Vin;而高效SA在其带宽内提供大部分负载电流。但在[3]中，跟踪带宽是有限的;[4]中的LA需要提供大部分高频负载电流，因为用于实现小输出纹波的超大电感(20µH);因此，限制了动态效率。图10.1.1显示了提出的宽带HA，采用两相开关(2PHSW)来减少纹波和提高静态效率，采用前馈带通滤波器(FF-BBF)来提高动态效率。

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2010 IEEE International Solid-State Circuits Conference - (ISSCC)

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