Power control method for improving power amplifier switch spectrum and circuit thereof

A technology of power amplifier and power control, which is applied to power amplifiers, improving amplifiers to improve efficiency, etc., can solve the problems of deterioration of switching spectrum characteristics of power amplifiers, and achieve the effects of improving switching spectrum characteristics, reducing change rate, and ingenious circuit design

Active Publication Date: 2015-05-13
BEIJING VANCHIP TESTING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution also has the following defects: when the power supply voltage of the mobile terminal is too low, the switching spectrum characteristics of the power amplifier will still deteriorate

Method used

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  • Power control method for improving power amplifier switch spectrum and circuit thereof
  • Power control method for improving power amplifier switch spectrum and circuit thereof
  • Power control method for improving power amplifier switch spectrum and circuit thereof

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Embodiment Construction

[0031] The technical content of the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0032] Such as figure 1 As shown, the linear voltage regulator circuit 101 used to implement the present invention includes an error amplifier 102, a feedback circuit 104, and a pass element 105. The error amplifier 102 is an operational amplifier. The inverting input terminal is connected to the power control signal Vramp provided by the outside world, the non-inverting input terminal is connected to one end of the feedback circuit 104, and the output terminal 103 is connected to the gate of the pass element 105; The source is connected to the power supply terminal Vdd, the drain 106 is connected to the other end of the feedback circuit, and is also connected to the collector of one or more power amplifiers. figure 1 Expressed in load. The linear regulator circuit 101 has two outputs: one output is the drain 106 of the pass element 10...

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Abstract

The invention provides a power control method for improving the power amplifier switch spectrum. The method comprises the steps that (1) the grid voltage and the drain voltage or grid voltage and power supply voltage of a passing element are detected, and the saturability information of the passing element is obtained; and (2) if the saturability information shows that the passing element is about to be separated from a saturability working zone, the drain current of the passing element is shunted to an error amplifier, and drain output voltage is lowered. Meanwhile, the invention discloses a power control circuit for achieving the method. Simple and ingenious circuit design is used, the changing rate of output voltage can be reduced, the output voltage is prevented from being close to power supply voltage quickly, the saturability of the passing element is maintained, and the switch spectrum feature of a power amplifier is obviously improved.

Description

Technical field [0001] The present invention relates to a power control method, in particular to a power control method for improving the switching spectrum characteristics of a mobile terminal power amplifier, and also to a power control circuit for realizing the above power control method, belonging to radio frequency circuit technology field. Background technique [0002] Radio frequency power amplifiers (RF PA) are widely used in wireless communication devices such as mobile phones. In the pre-stage circuit of the transmitter, the power of the RF signal generated by the modulation oscillator circuit is very small, and it needs to be amplified by a series of RF power amplifiers—buffer stage, intermediate amplifier stage, and final power amplifier stage to obtain sufficient RF power Later, it can be fed to the antenna for radiation. In this process, precise power control is essential to ensure the normal use of wireless communication equipment. [0003] Currently, there are mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F3/20
Inventor 刘希达
Owner BEIJING VANCHIP TESTING TECH CO LTD
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