Multi-Band RF Amplifier Voltage Tuning for Output Power Control
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Solution Overview
Problem
In wireless RF networks, existing solutions for configuring radio apparatuses with multiple frequency bands either require multiple high-efficiency power amplifiers for each band or a wideband amplifier, which have respective advantages and disadvantages, and there is a need for a method to optimize voltage characteristics for amplifiers to achieve specific output power levels while meeting performance requirements like efficiency and out-of-band rejection.
Innovation Solution
A radio apparatus and method that store reference data for voltage characteristics of amplifiers across different frequency bands, determining the required voltage settings based on this data to achieve specific output power levels, and adjust filter centre frequencies to meet performance criteria, allowing for optimized power distribution across multiple bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple high-efficiency power amplifiers are provided for each frequency band, then efficiency is improved, but device complexity increases
Solution Approach 1:
A single wideband power amplifier is designed to cover multiple frequency bands (e.g., 700MHz, 800MHz, 900MHz, 1800MHz, 2100MHz, 2600MHz) that would traditionally require separate narrowband amplifiers. This universal amplifier provides multi-functional capability, reducing the total number of amplifier units while maintaining high efficiency across all bands through optimized voltage characteristics and reference data storage.
2Device complexity
If a wideband power amplifier is used to cover multiple bands, then device complexity is reduced, but efficiency may deteriorate
Solution Approach 1:
The system stores reference data containing voltage characteristics (drain voltage, gate bias voltage, temperature compensation) for different output power levels and frequency bands. By dynamically adjusting these voltage parameters based on the operating band and required output power, the wideband amplifier maintains high efficiency across all frequency bands, preventing efficiency deterioration despite the broader bandwidth coverage.
3Reliability
If voltage characteristics are optimized for specific output power levels, then performance is improved, but measurement precision requirements increase
Solution Approach 1:
Reference data containing pre-measured and pre-optimized voltage characteristics (drain voltage, gate bias voltage, temperature compensation) for various output power levels and frequency bands is stored in the system during manufacturing or initial calibration. This preliminary action eliminates the need for real-time complex measurements during operation, reducing measurement precision requirements while ensuring reliable performance by directly applying pre-validated voltage settings from the reference data.
Data Source
AI summary
An apparatus is disclosed, comprising means for storing reference data indicative of characteristics for each of two or more amplifiers for amplifying signals in two or more respective bands, the reference data including voltage characteristics required by the particular amplifier to achieve a particular output power for a range of output power values for its respective frequency band. The apparatus may comprise means for receiving at least a first required output power for a first amplifier and a second required output power for a second amplifier, and determining, based on the reference data, the voltage characteristics required for the first amplifier to achieve the first required output power and the voltage characteristics required for the second amplifier to achieve the second required output power.