Load-line switching for push-pull power amplifiers

A technology for power amplifiers and load lines, applied in the field of load line switching for push-pull power amplifiers, capable of solving complex processing and calibration issues

Pending Publication Date: 2021-07-23
SKYWORKS SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods may involve complex processing and calibration and are therefore not always desirable in some applications

Method used

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  • Load-line switching for push-pull power amplifiers
  • Load-line switching for push-pull power amplifiers
  • Load-line switching for push-pull power amplifiers

Examples

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Embodiment Construction

[0037] Aspects and embodiments described herein are directed to improving the efficiency of a power amplifier by introducing a programmable loadline that can be switched to present a selected loadline impedance to the power amplifier for a given target transmit power, and Methods and circuits that extend battery life and improve device reliability are thus provided.

[0038] Load line switching may be static or dynamic in implementation. In general, dynamic loadline switching can potentially improve the efficiency of a power amplifier more than static loadline switching when driven with a complex modulation signal. However, the implementation of dynamic load line switching may be too complex for many applications and may require complex calibration routines. Static load-line switching is when the load-line impedance adjusts for average power without tracking the modulation envelope. Therefore, static load line switching can be implemented with less complexity than dynamic lo...

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Abstract

An amplifier system including a push-pull power amplifier having an input to receive a radio frequency (RF) input signal and an output, the push-pull power amplifier being configured to amplify the RF input signal and provide at the output an RF output signal that is an amplified version of the RF input signal, a switchable shunt capacitance switchably connected between a load-line connected to the output of the push-pull power amplifier and a reference potential, and a switch configured to selectively connect the switchable shunt capacitance to the reference potential and disconnect the switchable shunt capacitance from the reference potential to vary an impedance of load-line.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. Section 119 to U.S. Provisional Patent Application No. 62 / 736,540, filed September 26, 2018, entitled "LOAD-LINE SWITCHING FOR PUSH-PULL POWER AMPLIFIERS," by reference Its entire content is incorporated herein. Background technique [0003] In mobile applications such as cellular, it is very important to extend battery life to allow mobile devices to operate for relatively long periods of time without recharging. Power amplification is one of the features in mobile applications that consumes a lot of battery power. Several system and circuit implementations have aimed to reduce current consumption to extend battery life and improve thermal reliability of mobile devices. Some common methods for improving the efficiency of power amplifiers for cellular or other mobile applications include average power tracking (APT), envelope tracking (ET), and dynamic load-line tuning. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/26
CPCH03F3/26H03F1/565H03F2200/387H03F2200/451H03F2200/48H03F2200/534H03F2200/537H03F2200/541H03F3/245H03F3/195H03F2200/294H03F2200/378H03F2200/297H03F1/56H04B1/401
Inventor N·格贝耶赫席天佐康硕灿倪楠
Owner SKYWORKS SOLUTIONS INC
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