Closed-Loop Envelop Tracking System Calibrating Method And Apparatus

An envelope tracking and closed-loop technology, applied in the field of envelope tracking, can solve problems such as long factory calibration time, and achieve the effect of maintaining linearity

Inactive Publication Date: 2016-12-07
MEDIATEK INC
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  • Abstract
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  • Claims
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Problems solved by technology

However, open-loop calibration requires a priori information about the characteristics of the power amplifier, which requires a long factory calibration time due to the complexity of describing all the combinations of the different factors mentioned above

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Embodiment Construction

[0023] The following description is a preferred embodiment of the present invention. The following embodiments are only used to illustrate the technical features of the present invention, and are not used to limit the scope of the present invention. Certain terms are used throughout the specification and the following claims to refer to specific elements. Those skilled in the art should understand that manufacturers may use different terms to refer to the same components. This specification and claims do not use differences in names as ways to distinguish elements, but use differences in functions of elements as a basis for distinction. The terms "element", "system" and "device" used in the present invention may be entities related to a computer, where the computer may be hardware, software, or a combination of hardware and software. The terms "including" and "including" mentioned in the following description and claims are open-ended terms, so they should be interpreted as "...

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Abstract

The invention provides a closed-loop envelop tracking system calibrating method. The method comprises the following steps: transmitting a wireless signal in a wireless system by a wireless transmitter with a radio frequency (RF) module utilizing an envelope tracking (ET) adapting a power amplifier (PA) supply voltage with a PA target response; obtaining a reference signal on-the-fly, wherein the reference signal is a baseband digital signal of the transmitted wireless signal using a modulation signal specified by the wireless system; obtaining a detection signal on-the-fly through a coupler, wherein the detection signal is a partial feedback from down-sampled PA outputs; computing a difference between a measured response and the PA target response based on the reference signal and the detection signal; and adjusting a PA supply voltage compensation look up table (LUT) based on the computed difference to maintain the linearity of the ET. Accordingly, the invention also provides a closed-loop envelop tracking system calibrating apparatus, in order to improve the linearity of the ET.

Description

Technical field [0001] The present invention relates to envelope tracking for wireless devices, and more particularly, to a calibration method and device of a closed-loop envelope tracking system. Background technique [0002] In recent years, the wireless communication industry has developed exponentially. In any wireless communication system, a radio frequency transmitter plays an important role. The power amplifier (PA) used in the radio frequency transmitter is the final amplifier in the transmitter amplification chain. The performance of the power amplifier used in the wireless transmitter is critical and challenging to the transmission path of the wireless system. Since the purpose of the power amplifier is to drive high power to the load (such as an antenna) through the power supply circuit, the power amplifier consumes a large amount of power and is the main power loss of the transceiver unit. Further, since the power amplifier is a key element of the transmission path...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/13H04B17/14H03G3/20
CPCH04B17/13H03F1/02H03F1/32
Inventor 蔡秋薇彭嘉笙颜升宏
Owner MEDIATEK INC
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