Envelope swing limit circuit, signal swing limit device and envelope tracking power amplifier

An envelope tracking and swing limiting technology, which is applied to electrical components, reliability improvement and modification, transmission systems, etc., can solve problems such as circuit failure, signal distortion, and envelope slew rate over a large curve, so as to avoid direct damage or completely ruined effect

Active Publication Date: 2010-02-24
SHANGHAI HUAWEI TECH CO LTD
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

[0015] As mentioned earlier, if the envelope slew rate of the bandpass signal x(t) or x(n) is too large (the amplitude curve is too steep in the time-amplitude or sample-amplitude coordinate diagram), it will also cause the signal distortion or complete failure of the circuit

Method used

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  • Envelope swing limit circuit, signal swing limit device and envelope tracking power amplifier
  • Envelope swing limit circuit, signal swing limit device and envelope tracking power amplifier
  • Envelope swing limit circuit, signal swing limit device and envelope tracking power amplifier

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Embodiment Construction

[0050] The embodiment of the present invention provides an envelope swing limiting circuit composed of a single single-step swing limiting module or multiple cascaded single-step swing limiting modules, using different slew rate thresholds to trigger the comparison unit in the single-step swing limiting module to compare The envelope slew rate of two adjacent sample points, according to the result of the comparison, limits the upslope slew rate and / or downslope slew rate of the input signal, so that the slew rate of the final output signal of the envelope slew limiting circuit is relative to the input signal The slew rate is reduced. The embodiment of the present invention also provides a signal swing limiting device and an envelope tracking power amplifier using the above-mentioned envelope swing limiting circuit. Each will be described in detail below.

[0051] Please refer to figure 1 , a schematic diagram of the basic logic structure of the single-step swing limiting mod...

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Abstract

The embodiment of the invention provides an envelope swing limit circuit for solving the problem of overlarge signal swing ratio. The envelope swing limit circuit comprises a single-step swing limit module consisting of a time delay unit, a swing ratio generation unit, a comparing unit and a swing limit signal generation unit, wherein the swing limit signal generation unit is used for receiving the envelope amplitude of a signal to be limited to swing as well as the envelope amplitude, the comparing value and the swing ratio threshold of a delayed signal to be limited to swing and generating and outputting the envelope amplitude of a swing limit signal according to the comparing value so that the swing ratio of the swing limit signal does not excess the range of the swing ratio threshold.Therefore, the invention can ensure that a signal which is processed by the envelope swing limit circuit can be anamorphic after being input to other implements for secondary processing and also avoidthe direct damage or completely damage of elements caused by the violent variation of the envelope amplitude within short time.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an envelope swing limiting circuit, a signal swing limiting device and an envelope tracking power amplifier using the envelope swing limiting circuit. Background technique [0002] In modern communication systems, it is common practice for terminals to use various analog circuits (analog components) to process signals accordingly. For example, radio frequency signals need to be correspondingly amplified, mixed and / or filtered by analog circuits such as amplifiers, mixers and / or filters before transmission and after reception. In practical applications, any analog circuit is limited by its electrical characteristics that have been designed at the beginning of the design, such as the limitations of voltage and current thresholds and system bandwidth. Once the input signal amplitude or the bandwidth of the input signal exceeds these limits, the electrical characteris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H03K19/003
Inventor 叶四清袁宏成黎敏朱尔霓苏永革
Owner SHANGHAI HUAWEI TECH CO LTD
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