Integrated Linear Amplifier Bias Switching for Wide-Range Linearity
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Solution Overview
Problem
Existing radio frequency power amplifiers face challenges in miniaturization due to high power consumption, which affects the battery life of portable devices, and struggle to provide high-quality signals across a wide output power and frequency range.
Innovation Solution
A linear amplifier circuit with multiple matching circuits, power amplifiers, and a biasing circuit that dynamically activates power amplifiers based on output signal thresholds, along with a power sensing circuit for real-time feedback, to minimize power consumption and ensure high signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple power amplifiers are used in parallel or series to improve power consumption, then power efficiency is improved, but signal quality and linearity deteriorate across wide output power and frequency ranges
Solution Approach 1:
The patent implements dynamic switching between different power amplifier configurations (single PA mode, dual PA parallel mode, dual PA series mode) based on real-time output power requirements. The system transitions from static amplifier designs to dynamic reconfigurable architectures, selecting the appropriate configuration to maintain signal quality while optimizing power consumption across different operating conditions.
Solution Approach 2:
The patent changes the operational parameters of the power amplifiers by adjusting bias conditions and switching between different connection configurations (parallel/series) based on output power levels. This allows the system to adapt amplifier characteristics dynamically, maintaining linearity and signal quality across wide power and frequency ranges while improving overall power efficiency.
2Use of energy by moving object
If Doherty Technique with serially connected power amplifiers is used to reduce power consumption, then power efficiency is improved, but signal quality deteriorates in wide output power and frequency ranges
Solution Approach 1:
The patent segments the power amplification function into multiple independent power amplifier units that can operate independently or in combination. Instead of using a single Doherty amplifier configuration, the system divides the amplification task across multiple PAs with different power levels, allowing flexible combination to cover wide output power ranges while maintaining efficiency.
Solution Approach 2:
The patent creates a universal power amplification system where the same set of power amplifier units can perform multiple functions by switching between different connection configurations (single PA, dual PA parallel, dual PA series). This multi-functional architecture replaces the need for separate amplifiers for different power levels and modes, improving adaptability across wide output power and frequency ranges.
3Use of energy by moving object
If quadrature balanced amplifiers are used to reduce power consumption, then power efficiency is improved, but signal quality and linearity deteriorate across wide frequency ranges
Solution Approach 1:
The patent implements dynamic selection of active power amplifier units based on frequency requirements. The system can adaptively enable or disable specific PA units and adjust their operating frequencies to match the input signal characteristics, providing excellent linearity and signal quality across wide frequency ranges while maintaining power efficiency.
4Volume of moving object
If power amplifiers are miniaturized to decrease device size, then portability is improved, but power consumption increases
Solution Approach 1:
The patent divides the power amplification function into multiple smaller, lower-power amplifier units that can be integrated on a single chip. Instead of using one large high-power amplifier, the system uses multiple small PAs that can be selectively activated, reducing overall power consumption while maintaining the required output power capability and improving portability.
Data Source
AI summary
A linear amplifier circuit includes a first matching circuit that receives a first signal and to produce a first impedance matched signal, a first power amplifier that produces a first amplified signal in response to the first impedance matched signal under the control of a first bias signal, a second power amplifier that produces a second amplified signal in response to the first impedance matched signal under the control of a second bias signal, a biasing circuit that produces the first bias signal and the second bias signal. The first power amplifier can be activated by the first biasing signal when the power of the output signal is to exceed a first threshold value. The second power amplifier can be activated by the second biasing signal when the power of the output signal is below a second threshold value. A second matching circuit configured to receive the first amplified signal and the second amplified signal, and to produce an output signal.