Envelope-Tracking Amplifier Finger Control for Lower Power Loss
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Solution Overview
Problem
Existing power amplifiers in mobile communication devices face inefficiencies due to high peak-to-average power ratios in signals, leading to increased energy consumption and reduced operational efficiency, especially when handling time-varying input signals.
Innovation Solution
The implementation of modulated supply amplifiers that dynamically adjust power supply voltages and the number of active amplifier fingers based on the envelope of the input signal, using control circuitry to optimize efficiency and linearity by varying cascode control voltages and power supply voltages in response to changing input signal parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of amplifier fingers and supply voltage are kept constant, then the amplifier can maintain stable operation, but energy consumption increases and efficiency decreases when handling time-varying signals with high peak-to-average power ratios
Solution Approach 1:
The patent implements dynamic adjustment of the number of active amplifier fingers and supply voltage based on the envelope of the input signal. The control circuitry monitors the signal envelope and dynamically reconfigures the amplifier by enabling or disabling specific amplifier fingers and adjusting the supply voltage accordingly, allowing the system to adapt to time-varying signal conditions and optimize energy consumption while maintaining operational stability.
Solution Approach 2:
The patent changes operational parameters (number of active amplifier fingers and supply voltage) in response to varying signal conditions. The control circuitry detects the envelope of the input signal and adjusts the amplifier configuration parameters to match the current load conditions, thereby improving energy efficiency without compromising reliability.
2Power
If the amplifier operates at maximum power supply voltage and all amplifier fingers are active, then the amplifier can handle peak signal demands, but energy consumption increases during low-power operation
Solution Approach 1:
The patent dynamically adjusts the supply voltage and the number of active amplifier fingers based on the detected envelope of the input signal. During peak signal demands, the amplifier operates at maximum power supply voltage with all fingers active. During low-power operation, the control circuitry reduces the supply voltage and deactivates unnecessary amplifier fingers, thereby minimizing energy waste while maintaining the capability to handle peak demands when needed.
Solution Approach 2:
The patent applies partial action by activating only the necessary number of amplifier fingers required to handle the current signal level, rather than keeping all fingers active at all times. This partial activation approach reduces energy consumption during low-power operation while maintaining sufficient amplification capacity for peak demands.
3Device complexity
If the amplifier uses a fixed number of amplifier fingers, then the circuit design is simpler, but the amplifier efficiency cannot be optimized for varying signal conditions
Solution Approach 1:
The patent introduces dynamic control capability that allows the amplifier to adjust the number of active fingers based on signal conditions. The control circuitry monitors the envelope of the input signal and dynamically reconfigures the amplifier by enabling or disabling specific amplifier fingers, optimizing efficiency for varying signal conditions while adding only moderate circuit complexity.
Solution Approach 2:
The patent segments the amplifier into multiple independent amplifier fingers that can be individually controlled. This segmentation allows the control circuitry to selectively activate or deactivate specific fingers based on the current signal level, enabling efficiency optimization without requiring a complete redesign of the entire amplifier structure.
Data Source
AI summary
An amplifier may include control circuitry that may track a first input signal parameter and, in response, adjust a value of a second input parameter. Input parameter tracking and adjustment may facilitate control of output parameters for the amplifier. For example, an envelope-tracking amplifier may track input signal amplitude and adjust other input parameters in response. The adjustments may facilitate control of output parameters, such as gain or efficiency. The amplifier may further include calibration circuitry to determine adjustment responses to various tracked input parameters.