公开(公告)号：US20150002235A1

公开(公告)日：2015-01-01

申请号：US14488114

申请日：2014-09-16

Applicant: QUALCOMM Incorporated

Inventor： Lennart Karl-Axel MATHE ,  Pengfei LI ,  Song S. SHI ,  Yunfei SHI ,  Joseph D. RUTKOWSKI

IPC: H03F1/02 ,  H03F3/21 ,  H03F3/19

CPC classification number: H03F1/0222 ,  H03F1/0227 ,  H03F3/19 ,  H03F3/21 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/451

Abstract: Techniques for dynamically generating a headroom voltage for an envelope tracking system. In an aspect, an initial headroom voltage is updated when a signal from a power amplifier (PA) indicates that the PA headroom is insufficient. The initial headroom voltage may be updated to an operating headroom voltage that includes the initial voltage plus a deficiency voltage plus a margin. In this manner, the operating headroom voltage may be dynamically selected to minimize power consumption while still ensuring that the PA is linear. In a further aspect, a specific exemplary embodiment of a headroom voltage generator using a counter is described.

Abstract translation: 用于动态产生包络跟踪系统的净空电压的技术。 在一方面，当来自功率放大器（PA）的信号指示PA余量不足时，更新初始余量电压。 初始余量电压可以被更新为包括初始电压加上缺陷电压加上余量的操作净空电压。 以这种方式，可以动态选择操作净空电压以最小化功耗，同时仍然确保PA是线性的。 在另一方面，描述了使用计数器的净空电压发生器的具体示例性实施例。

公开(公告)号：US20210083576A1

公开(公告)日：2021-03-18

申请号：US16573825

申请日：2019-09-17

Applicant: QUALCOMM Incorporated

Inventor： Mukesh BANSAL ,  Pengfei LI ,  Moataz Abdelsamie ABDELFATTAH ,  Iulian MIREA ,  Song SHI

IPC: H02M3/158 ,  H03K3/037

Abstract: A method for unbalancing a tri-level switching regulator uses hysteretic control when switching across multiple states of the tri-level switching regulator. The method includes determining a battery voltage and an output voltage of the tri-level switching regulator. The method also includes dynamically adjusting at least one of a first hysteretic window of a first hysteretic comparator associated with a second switching state of the tri-level switching regulator and a second hysteretic window of a second hysteretic comparator associated with a first switching state of the tri-level switching regulator based on the battery voltage and the output voltage.