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

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...

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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

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