Charge Pump PA Bias Supply Undershoot Prevention
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Solution Overview
Problem
Traditional multi-mode multi-band RF communications devices require complex and costly circuitry to support various wireless communications protocols and frequency bands, necessitating efficient and compact RF power amplifier (PA) solutions that maintain amplitude modulation characteristics while minimizing size, cost, and power consumption.
Innovation Solution
A charge pump-based PA bias power supply system that operates in multiple modes to prevent undershoot disruption, ensuring stable voltage delivery and optimizing efficiency, combined with a quadrature PA architecture that simplifies circuit topology and tolerates antenna loading changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a charge pump-based PA bias power supply is used to reduce size and cost, then device complexity and cost are reduced, but voltage undershoot disruption occurs during mode transitions
Solution Approach 1:
The patent applies preliminary action by setting a minimum on-time duration for the charge pump circuit before allowing mode transitions to occur. This ensures that the charge pump circuit has sufficient time to establish stable voltage output before switching operating modes, preventing voltage undershoot disruption while maintaining a compact design.
Solution Approach 2:
The patent implements dynamics by making the charge pump circuit's operating parameters adaptive based on its current state. The system dynamically adjusts the minimum on-time duration based on whether the charge pump is in pump-up mode or bypass mode, allowing optimal performance across different operating conditions while maintaining reliability during transitions.
2Use of energy by moving object
If the charge pump operates in bypass mode to improve efficiency, then power consumption is reduced, but voltage adequacy cannot be guaranteed during transitions
Solution Approach 1:
The patent applies feedback by continuously monitoring the charge pump circuit's operating mode and using this information to control the enable signal timing. The system feedback ensures that mode transitions only occur when the charge pump has sufficient time to stabilize, preventing voltage undershoot while allowing efficient bypass mode operation during steady-state conditions.
Solution Approach 2:
The patent ensures voltage adequacy during transitions by implementing a minimum on-time requirement before allowing mode switches. This preliminary action guarantees that the charge pump circuit has sufficient time to establish adequate voltage output before transitioning from pump-up mode to bypass mode, preventing power consumption issues while maintaining voltage stability.
3Speed
If mode transitions are allowed immediately to improve responsiveness, then operational speed is improved, but voltage undershoot disruption occurs
Solution Approach 1:
The patent resolves the contradiction between speed and reliability by implementing a minimum on-time mechanism that allows the charge pump circuit to stabilize before mode transitions. This ensures rapid yet stable transitions by preventing immediate switching, thereby avoiding voltage undershoot while maintaining operational responsiveness.
Solution Approach 2:
The patent makes the mode transition timing dynamic by adjusting the minimum on-time duration based on the charge pump's current operating state. This dynamic approach allows faster transitions when appropriate while preventing undershoot when the circuit needs stabilization time, optimizing both speed and reliability adaptively.
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 enables compact, efficient, and cost-effective multi-mode multi-band RF communications devices by stabilizing bias power supply and simplifying PA architecture, thereby enhancing performance and reducing power consumption.
Implementation Method 1
A charge pump-based PA bias power supply system that operates in multiple modes to prevent undershoot disruption
Data Source
AI summary
A charge pump of a power amplifier (PA) bias power supply and a process to prevent undershoot disruption of a bias power supply signal of the PA bias power supply are disclosed. The charge pump operates in one of multiple bias supply pump operating modes, which include at least a bias supply pump-up operating mode and a bias supply bypass operating mode. The process prevents selection of the bias supply pump-up operating mode from the bias supply bypass operating mode before charge pump circuitry in the charge pump is capable of providing adequate voltage to prevent undershoot disruption of the bias power supply signal.