Sample-and-Hold Current Sensing for Multi-Mode RF Power Amplifiers
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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 linear mode performance while allowing for non-linear operation to enhance efficiency.
Innovation Solution
The implementation of a sample-and-hold current estimating circuit and a switching power supply that samples voltage across a series switching element during an ON state and ramping signal peak to estimate output current, enabling efficient power amplification across multiple modes and bands with reduced circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional circuitry is used to support multiple wireless communications protocols and frequency bands, then device functionality and versatility are improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal current sensing mechanism that serves multiple functions: it senses current for both linear mode and non-linear mode operations, supports multiple wireless communications protocols, and works across different frequency bands. This single multi-functional circuit replaces what would traditionally require separate dedicated circuits for each mode and protocol, thereby reducing overall device complexity while maintaining versatility
Solution Approach 2:
The patent employs dynamic switching between linear mode and non-linear mode operations based on real-time conditions. The system can adaptively change its operating mode to optimize performance for different wireless communications protocols and frequency bands, allowing the same hardware to handle diverse requirements without requiring fixed dedicated circuits for each mode
2Reliability
If linear mode operation is maintained for all protocols, then signal quality and performance are improved, but energy efficiency decreases
Solution Approach 1:
The patent implements dynamic mode switching that allows the power amplifier to operate in linear mode when high signal quality is required (such as for protocols sensitive to distortion) and switch to non-linear mode when energy efficiency is the priority (such as for protocols more tolerant of distortion). This dynamic adaptation enables the system to optimize the trade-off between reliability and energy consumption based on real-time operational requirements
Solution Approach 2:
The patent changes the operating parameters of the power amplifier by switching between linear and non-linear modes. By adjusting the amplification characteristics and operating point of the amplifier based on the specific protocol and frequency band being used, the system can achieve both high signal quality when needed and improved energy efficiency when appropriate
3Use of energy by moving object
If non-linear operation is enabled to improve efficiency, then energy efficiency is improved, but signal quality and linear mode performance deteriorate
Solution Approach 1:
The patent employs dynamic mode selection that allows the system to switch between linear and non-linear operation based on the specific requirements of each wireless communications protocol and frequency band. For protocols and bands where signal quality is critical, the system maintains linear mode operation, while for those where efficiency is more important, it transitions to non-linear mode, thus preventing performance deterioration in critical applications
4Reliability
If separate circuits are used for each mode and protocol, then mode-specific performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal current sensing and control mechanism that can accurately sense and control current for both linear mode and non-linear mode operations, as well as for multiple wireless communications protocols and frequency bands. This single multi-functional circuit replaces what would traditionally require separate dedicated circuits for each mode and protocol, thereby reducing overall device complexity and cost while maintaining mode-specific performance through adaptive control
Solution Approach 2:
The patent segments the current sensing function into distinct operational phases (linear mode sensing and non-linear mode sensing) that can be selectively activated based on the operating mode. This segmentation allows the same hardware to be optimized for different modes through software or control logic rather than requiring separate physical circuits for each mode
Data Source
AI summary
A sample-and-hold (SAH) current estimating circuit and a first switching power supply are disclosed. The first switching power supply provides a first switching power supply output signal based on a series switching element and a setpoint. The SAH current estimating circuit samples a voltage across the series switching element of the first switching power supply during an ON state of the series switching element and during a ramping signal peak to provide an SAH output signal based on an estimate of an output current of the first switching power supply output signal. The first switching power supply selects the ON state of the series switching element, such that during the ramping signal peak, the series switching element has a series current having a magnitude, which is about equal to a magnitude of the output current of the first switching power supply output signal.