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Double-switch power supply modulator for envelope tracking system

A power modulation and envelope tracking technology, applied in control/regulation systems, DC-coupled DC amplifiers, instruments, etc., can solve problems such as low efficiency of power modulators, inability to meet system requirements well, etc., and achieve ingenious structural design. , efficiency improvement, the effect of improving efficiency

Inactive Publication Date: 2015-09-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-efficiency power modulator for an envelope tracking system, which mainly solves the problem that the power modulator in the prior art has low efficiency and cannot better meet the system requirements

Method used

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  • Double-switch power supply modulator for envelope tracking system
  • Double-switch power supply modulator for envelope tracking system

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Embodiment

[0024] The structure of this embodiment is as figure 1 As shown, the power modulator includes: linear amplifier stage ( figure 1 Zone 1 in), the main switching converter stage ( figure 1 in Zone 2), and the compensating switching stage ( figure 1 Area 3 in), I1, I2, I3 and Iout refer to the current flow direction of the output node. figure 1 The X node voltage follows the input voltage Vin, and the resistor R1 prevents it very little. The voltage of the output node Y is approximately equal to the node X voltage, which is determined by the linear level 1.

[0025] When there is an input, the X node voltage changes with the input voltage Vin, the linear stage 1 outputs current at the X node to the output node Y, and these currents form a voltage difference across the resistor R1, and the comparator U2 senses this voltage difference and outputs the control voltage V1 is at a high level, and the switch U4 is controlled to be turned on through the driver stage U3. The inductor ...

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Abstract

The invention discloses a double-switch power supply modulator for an envelope tracking system and belongs to the field of integrated circuits. The double-switch power supply modulator for the envelope tracking system mainly solves the problem that a power supply modulator of an envelope tracking amplifier in the prior art is low in efficiency and cannot well meet system requirements. The power supply modulator is of a double-switch converter structure and comprises a linear amplifier stage, a main switch converter stage and a compensation switch stage, output current is combined into an output signal of the whole power supply modulator, and power is supplied to a radio frequency power amplifier. Due to the fact that current output from a linear stage is compensated for by adding the compensation switch stage, the output current of a low-efficiency linear amplifier is reduced, and the overall efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a dual-switch power supply modulator used in an envelope tracking system. Background technique [0002] Envelope tracking technology is an effective means to improve the efficiency of power amplifiers when processing signals with high peak-to-average power ratio. The power modulator is the core component of the envelope tracking system, and its efficiency has an important impact on the overall efficiency of the envelope tracking system. Most traditional power modulators use a linear amplifier-switching converter hybrid structure, which has good linearity, simple structure and low cost, but low efficiency, which cannot well meet the system requirements. Therefore, it is practically necessary to invent and create a high-efficiency power modulator structure for an envelope tracking system. Contents of the invention [0003] The purpose of the present inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/45G05F1/46
Inventor 康凯熊翼通赵晨曦陈东
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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