PA Supply Voltage Control Using APT and ETSM for Signal Integrity
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Solution Overview
Problem
Parasitic capacitances in power amplifiers (PAs) for transmitting front ends can degrade the signal integrity of RF signals, and existing solutions have not effectively addressed this issue.
Innovation Solution
A voltage control device that dynamically adjusts supply voltages to the PA using an average-power-tracking (APT) mechanism for the driving stage amplifier and an envelope-tracking-supply-modulation (ETSM) mechanism for the output stage amplifier, thereby reducing power dissipation and improving signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single supply voltage is provided to the power amplifier, then the device complexity is reduced, but the signal integrity deteriorates due to parasitic capacitances
Solution Approach 1:
The power amplifier is divided into multiple stages (driving stage and output stage), and each stage is provided with a separate supply voltage controlled by independent processing circuits. This segmentation allows different voltage control strategies to be applied to different stages, improving signal integrity while managing complexity.
Solution Approach 2:
The supply voltages are made dynamic rather than fixed. The first processing circuit dynamically adjusts the first supply voltage based on average power level, and the second processing circuit dynamically adjusts the second supply voltage based on envelope tracking. This dynamic adjustment compensates for parasitic capacitance effects and improves signal integrity.
2Reliability
If supply voltage is dynamically adjusted using APT and ETSM mechanisms, then signal integrity is improved, but the device complexity increases
Solution Approach 1:
The processing circuits are designed to perform multiple functions. The first processing circuit not only provides supply voltage but also implements APT mechanism for average power tracking. The second processing circuit implements ETSM mechanism for envelope tracking. This multi-functionality reduces the need for separate dedicated circuits for each function.
Solution Approach 2:
The voltage control device automatically adjusts supply voltages based on feedback from power level and envelope information without requiring external manual intervention. The APT and ETSM mechanisms enable the system to self-regulate the supply voltages according to the operating conditions, reducing the need for additional control circuitry.
3Loss of energy
If separate supply voltages are provided to different amplifier stages, then power dissipation is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The APT mechanism uses feedback from the average power level to dynamically adjust the first supply voltage. The ETSM mechanism uses feedback from the envelope information to dynamically adjust the second supply voltage. This feedback control ensures that the supply voltages are precisely adjusted according to actual operating conditions, meeting manufacturing precision requirements while reducing power dissipation.
Solution Approach 2:
The supply voltage parameters are dynamically changed based on operating conditions rather than being fixed. The first supply voltage is adjusted according to average power level, and the second supply voltage is adjusted according to envelope tracking. This parameter adaptation allows the system to optimize power dissipation while maintaining voltage control precision through dynamic adjustment.
Data Source
AI summary
The disclosure provides a voltage control device for controlling supply voltages of a power amplifier (PA). The voltage control device includes a first processing circuit to provide a first supply voltage to at least one driving stage amplifier of the PA, and a second processing circuit to provide a second supply voltage to an output stage amplifier of the PA. The first supply voltage is generated according to an average-power-tracking (APT) mechanism related to an average power level of a radio frequency (RF) signal transmitted by the PA.