Switched-Capacitor Tracker Circuit for Discrete PA Supply Voltages
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Solution Overview
Problem
Existing power amplifier circuits in 5G IoT devices face challenges in achieving further improvements in power efficiency, particularly in digital envelope tracking (D-ET) mode.
Innovation Solution
A tracker circuit is implemented with switched-capacitor circuits and a supply modulator to generate and selectively output multiple discrete voltages, including a first, second, and third output voltage, to power amplifiers, optimizing power efficiency in D-ET mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If digital envelope tracking (D-ET) is implemented to improve power efficiency, then power consumption is reduced, but the ability to achieve further improvements in power efficiency is limited
Solution Approach 1:
The voltage output is segmented into multiple discrete levels (first output voltage, second output voltage, third output voltage) generated by switched-capacitor circuits. This segmentation allows the power amplifier to operate at different voltage levels according to signal requirements, enabling finer-grained power efficiency optimization beyond conventional D-ET approaches.
Solution Approach 2:
The tracker circuit dynamically selects and outputs different discrete voltages based on real-time signal conditions. The supply modulator dynamically switches between voltage levels, and the switched-capacitor circuits dynamically generate appropriate voltage differences, enabling adaptive power efficiency improvement that responds to varying operational demands.
2Power
If multiple discrete voltages are generated to optimize power efficiency, then power-added efficiency (PAE) is improved, but device complexity increases
Solution Approach 1:
Multiple voltage generation functions are merged into a unified tracker circuit architecture. The first and second switched-capacitor circuits are combined to generate multiple discrete voltages from a single input voltage, and the supply modulator integrates the selection and output of these voltages. This merging reduces overall system complexity compared to implementing separate voltage generation circuits for each voltage level.
Solution Approach 2:
The switched-capacitor circuits serve multiple functions: they act as voltage reference sources, voltage difference generators, and power supply elements for the power amplifier. The tracker circuit universally handles both voltage generation and selection functions, reducing the need for separate dedicated circuits and thereby managing complexity while achieving multiple discrete voltage output.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances power efficiency in D-ET mode by dynamically regulating power supply voltages, improving performance in 5G IoT devices.
Implementation Method 1
a first switched-capacitor circuit configured to generate, from a first input voltage, a first output voltage and a second output voltage that is lower than the first output voltage
Data Source
AI summary
A tracker circuit is provided that includes a switched-capacitor circuit that generates, from a first input voltage, a first output voltage and a second output voltage that is lower than the first output voltage; a switched-capacitor circuit that generates, from the first output voltage and the second output voltage, a third output voltage that is lower than the first output voltage and higher than the second output voltage; and a supply modulator that selectively outputs, to a power amplifier, at least one of a plurality of discrete voltages that includes the first output voltage, the second output voltage, and the third output voltage.