A Power Amplifier Structure Based on Negative Feedback

A power amplifier and negative feedback technology, applied in the field of power amplifier structure based on negative feedback, can solve problems such as obvious distortion, complex system, predistortion error, etc., and achieve the effects of improving reliability, large linear power, and reducing complexity

Active Publication Date: 2018-09-04
SOI MICRO CO LTD
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Problems solved by technology

[0004] However, the current application of envelope tracking technology has the following problems: envelope tracking technology needs the support of power amplifier, envelope modulator and baseband algorithm, so the system is complex
In addition, the baseband’s correction of the delay and the generation of the envelope waveform are essentially feed-forward pre-distortion. Due to the lack of feedback, there will be errors in the pre-distortion. The distortion caused by the error will be more obvious under extreme temperatures and chip process corners.

Method used

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  • A Power Amplifier Structure Based on Negative Feedback
  • A Power Amplifier Structure Based on Negative Feedback
  • A Power Amplifier Structure Based on Negative Feedback

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Embodiment Construction

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] like figure 2 shown, figure 2 It is a block diagram of a power amplifier structure based on negative feedback provided by the present invention. The power amplifier structure is to add an output signal envelope detector (Envelope Detector) connected in sequence between the output end and the power supply end of an existing common power amplifier (PA). ), attenuator (Attenuator) and envelope amplifier (EnvelopeAmplifier), so that the power amplifier, output signal envelope detector, attenuator and envelope amplifier form a feedback loop. The envelope amplifier dynamically adjusts the power supply voltage of the power amplifier by comparing the envelope of the RF input signal of the power amplifier and the envelope of the RF output ...

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Abstract

The invention discloses a negative-feedback-based power amplifier structure. According to the power amplifier structure, an output signal envelope detector, an attenuator and an envelope amplifier sequentially connected are added between the output end of a power amplifier and a power supply end, so that the power amplifier, the output signal envelope detector, the attenuator and the envelope amplifier form a feedback loop. Through comparison of the envelope of the power amplifier radio frequency input signal and the envelope of the power amplifier radio frequency output signal, the envelope amplifier dynamically adjusts the power supply voltage of the power amplifier, so that constant gain of the power amplifier can be realized, furthermore, the efficiency of modulating signal outputting of the power amplifier is sharply improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, such as radio frequency transmitter in 3G, 4G communication and wireless local area network, especially a power amplifier structure based on negative feedback, the power amplifier structure is an important circuit module in the radio frequency transmitter. Background technique [0002] High-speed wireless communication technologies such as 3G and 4G mobile communications and wireless local area networks all use modulated signals with a peak-to-average ratio, which causes the power amplifier to back off a large amount of power to meet the linearity requirements of the above-mentioned peak-to-average ratio modulated signal. The power backoff causes the power amplifier to work in a state of lower output power most of the time, so the efficiency is very low. [0003] To solve this problem, academia has proposed several solutions based on polar coordinate transmitters, including envelope ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/34H03F1/32H03F3/217
Inventor 刘昱萧延彬李志强张海英
Owner SOI MICRO CO LTD
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