Tracker Circuit With Switched-Capacitor Voltage Modes for 3Tx Stability
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Solution Overview
Problem
The stability of supply voltage is degraded in 3Tx-support D-ET circuits due to simultaneous transmission of three radio-frequency signals in user equipment.
Innovation Solution
A tracker circuit with a pre-regulator circuit, switched-capacitor circuit, and supply modulators that generate and selectively supply multiple discrete voltages to power amplifiers, adjusting voltage levels based on transmission modes to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple discrete voltages are supplied to three power amplifiers simultaneously for 3Tx operation, then power transmission efficiency is improved, but supply voltage stability is degraded
Solution Approach 1:
The switched-capacitor circuit dynamically adjusts voltage levels based on transmission mode. In 3Tx mode, it provides stable high voltage through capacitive coupling; in other modes, it steps up/down voltages as needed. This dynamic adaptation resolves the contradiction by making the voltage supply system flexible rather than fixed.
Solution Approach 2:
The circuit changes voltage parameters (levels and stability characteristics) based on operational mode. The pre-regulator circuit maintains stable output voltage, while the switched-capacitor circuit transforms this stable voltage into multiple discrete voltage levels appropriate for different transmission modes, thus maintaining stability while enabling efficient power transmission.
2Reliability
If a pre-regulator circuit is used to generate regulated voltage, then voltage stability is improved, but circuit complexity increases
Solution Approach 1:
The pre-regulator circuit and switched-capacitor circuit are merged into an integrated voltage supply system. The pre-regulator provides stable baseline voltage, while the switched-capacitor circuit adds voltage transformation capability using the same regulated input, reducing overall system complexity compared to having separate regulation stages for each voltage level.
Solution Approach 2:
The pre-regulator circuit serves multiple functions: it provides stable voltage for 3Tx mode operation and simultaneously serves as the input source for the switched-capacitor circuit to generate other voltage levels. This multi-functionality reduces the need for separate regulation circuits, thereby reducing overall complexity while maintaining stability.
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
Improves the stability of supply voltage in 3Tx systems by dynamically generating discrete voltages through stepping up or down, ensuring efficient power transmission.
Implementation Method 1
a switched-capacitor circuit that is configured to generate multiple discrete voltages based on the regulated voltage
Data Source
AI summary
A tracker circuit is provided that includes a pre-regulator circuit, a switched-capacitor circuit, and supply modulators. The pre-regulator circuit generates a regulated voltage based on an input voltage. The switched-capacitor circuit generates multiple discrete voltages based on the regulated voltage. The supply modulators selectively supply at least one of the multiple discrete voltages to power amplifiers. In a first transmission mode in which the power amplifiers operate simultaneously, the switched-capacitor circuit generates multiple discrete voltages by stepping down the regulated voltage. In a second transmission mode in which at least one of the power amplifiers does not operate, the switched-capacitor circuit generates multiple discrete voltages by stepping up and stepping down the regulated voltage.