Power Amplifier Bias Adjustment for Wireless Transceivers
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Solution Overview
Problem
Portable electronic devices face challenges in reducing power consumption of wireless communications circuitry, which limits battery life and efficiency, especially due to varying power amplifier linearity requirements across different modulation schemes and frequency bands.
Innovation Solution
The implementation of an adjustable voltage supply for power amplifier circuitry, allowing real-time adjustment of bias voltage based on the current modulation scheme and operating conditions to optimize power consumption while maintaining performance criteria, such as minimizing adjacent channel leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power amplifier bias voltage is maintained at high levels to ensure sufficient linearity for all modulation schemes, then the linearity performance is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the power amplifier bias voltage based on the currently active modulation scheme. The bias voltage is varied in real-time according to the linearity requirements of different modulation schemes (e.g., QPSK, 16-QAM, 64-QAM), ensuring sufficient linearity when needed while reducing power consumption when less stringent requirements are acceptable.
Solution Approach 2:
The patent changes the bias voltage parameter of the power amplifier according to the modulation scheme being used. Different modulation schemes have different linearity requirements, and the bias voltage is adjusted to match these requirements, optimizing the trade-off between linearity performance and power consumption for each specific communication scenario.
2Use of energy by moving object
If the power amplifier bias voltage is reduced to minimize power consumption, then the power efficiency is improved, but the linearity performance deteriorates
Solution Approach 1:
The system dynamically adjusts the bias voltage based on the operational requirements. When modulation schemes with lower linearity requirements are used, the bias voltage is reduced to improve power efficiency. When high linearity is required, the bias voltage is increased to maintain performance, creating an adaptive system that optimizes both efficiency and reliability.
Solution Approach 2:
The bias voltage parameter is changed according to the modulation scheme requirements. The system identifies the current modulation scheme and adjusts the bias voltage accordingly, allowing the power amplifier to operate at optimal efficiency points while maintaining sufficient linearity for the specific communication standard being used.
3Adaptability or versatility
If multiple power amplifiers are used to support different cellular telephone standards and frequency bands, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent employs multiple power amplifiers that can be selectively activated depending on the cellular standard and frequency band in use. Each power amplifier is configured to handle specific standards or bands, allowing the system to support multiple communication protocols while managing complexity through selective activation rather than requiring all amplifiers to be simultaneously operational.
Solution Approach 2:
The power amplifier subsystem is segmented into multiple specialized amplifiers, each optimized for specific cellular standards or frequency bands. This segmentation allows the system to activate only the necessary amplifier for the current communication requirement, reducing the overall complexity burden compared to a single universal amplifier design.
Data Source
AI summary
An electronic device may contain wireless circuitry that transmits and receives radio-frequency signals through antenna structures. Power amplifier circuitry may amplify the radio-frequency signals that are being transmitted. An adjustable voltage supply may supply an adjustable power amplifier bias voltage to the power amplifier circuitry. The power amplifier circuitry may include multiple power amplifiers each of which may handle signals transmitted using a different cellular telephone standard. For each cellular telephone standard, multiple modulation schemes may be supported. Some modulation schemes may have greater power amplifier linearity requirements than others. Control circuitry can adjust the adjustable power amplifier bias voltage in real time to select an optimum power amplifier bias voltage based on the current cellular telephone standard, modulation scheme, power amplifier gain state, and operating frequency in use.