Fast Tracking Power Supply with Parallel Compensation for PA Bandwidth
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Solution Overview
Problem
Modern wireless communication systems, such as CDMA, WCDMA, UMTS, and LTE, require high bandwidth and efficiency in power amplification due to variable envelope modulation, which existing power supplies struggle to meet, leading to output noise and distortion that affect Adjacent Channel Power Ratio (ACPR).
Innovation Solution
A fast tracking power supply device and method that includes a basic voltage output unit, a compensation voltage output unit, and a control unit, where the basic voltage output unit provides low bandwidth and high efficiency, and the compensation voltage output unit provides high bandwidth and high precision, with the linear amplifier connected in parallel to reduce power loss and enhance overall efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a linear amplifier is used to amplify the envelope signal, then the bandwidth is improved, but the efficiency deteriorates
Solution Approach 1:
The power supply device is segmented into two functional modules: a basic voltage output unit providing high efficiency with limited bandwidth, and a compensation voltage output unit providing high bandwidth with lower efficiency. This segmentation allows each module to operate in its optimal performance range, resolving the contradiction between bandwidth and efficiency.
Solution Approach 2:
The patent merges the basic voltage output unit and compensation voltage output unit into a unified power supply system where their outputs are combined. The basic unit handles the majority power delivery efficiently, while the compensation unit supplements with high-bandwidth tracking capability, achieving both high efficiency and high bandwidth simultaneously.
2Loss of energy
If an ordinary switch power supply is used, then the efficiency is improved, but the bandwidth deteriorates
Solution Approach 1:
The power supply is divided into a basic voltage output unit (providing efficiency) and a compensation voltage output unit (providing bandwidth). The basic unit uses switch-mode architecture for high efficiency, while the compensation unit uses linear regulation for high bandwidth tracking, thus resolving the efficiency-bandwidth tradeoff.
Solution Approach 2:
The compensation voltage output unit acts as an intermediary that bridges the bandwidth limitation of the switch power supply. It receives the same input signal and provides a high-bandwidth compensated output that supplements the basic unit's output, enabling the overall system to achieve both efficiency and bandwidth.
3Manufacturing precision
If the fast tracking power supply amplifies the envelope signal with high bandwidth, then the linearity is improved, but the power loss increases
Solution Approach 1:
The system segments the amplification function: the basic voltage output unit handles the majority of power delivery with switch-mode efficiency, while the compensation voltage output unit provides the precise high-bandwidth tracking needed for linearity. This segmentation ensures high linearity without proportionally high power loss.
Solution Approach 2:
Instead of using a single high-bandwidth linear amplifier for the entire power delivery (which would cause excessive power loss), the patent uses partial action: the compensation unit provides only the necessary tracking precision and bandwidth correction, while the basic unit handles the bulk power delivery efficiently. This partial approach achieves linearity with minimal power loss.
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3
AI summary
A fast tracking power supply device, a fast tracking power supply control method, and communication equipment are provided. The fast tracking power supply device includes: a basic voltage output unit, configured to output a basic voltage; a basic current unit, configured to output a basic current; a linear amplifier, configured to output a compensation current and a compensation voltage, the linear amplifier is connected in parallel with the basic current output unit, and then is connected in series with the basic voltage output unit. The device can output signal with high efficiency and bandwidth.