Power Amplifier Biasing With Offset Correction Across Wide Supply Range
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Solution Overview
Problem
Existing bias controllers for power amplifiers face challenges in accurately biasing power amplifiers over a wide range of supply voltages due to non-linear offset error characteristics, requiring complex calibration and circuitry.
Innovation Solution
A bias controller with a current sensor that exhibits a non-linear offset error characteristic is calibrated using a first set of offsets matching the error characteristic over a second range of power supply voltages within the first range, allowing for accurate biasing across a wide supply voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bias controller uses a current sensor with non-linear offset error characteristic over a wide supply voltage range, then the biasing accuracy deteriorates, but using multiple sets of offsets for different voltage ranges increases device complexity
Solution Approach 1:
The wide supply voltage range is divided into multiple smaller voltage ranges, with each range having its own dedicated set of offset values. The bias controller selects the appropriate offset set based on the current supply voltage range, thereby maintaining high biasing accuracy without requiring complex continuous correction circuits
Solution Approach 2:
Multiple sets of offset values are pre-calculated and stored in memory during manufacturing for different supply voltage ranges. This preliminary calibration eliminates the need for complex real-time calibration circuits during operation, reducing device complexity while maintaining accuracy
2Adaptability or versatility
If a bias controller is calibrated for accurate operation over a wide supply voltage range, then the calibration time increases, but operating over a narrow voltage range reduces adaptability
Solution Approach 1:
The bias controller is pre-calibrated during manufacturing to cover the entire wide supply voltage range by storing multiple offset sets in memory. This preliminary comprehensive calibration eliminates the need for time-consuming field calibration, reducing calibration time to minimal operations while maintaining wide voltage adaptability
Solution Approach 2:
The bias controller changes operational parameters (selected offset set) based on the supply voltage range detection. By switching between pre-stored offset sets corresponding to different voltage ranges, the system achieves wide adaptability without requiring time-consuming continuous calibration
Data Source
AI summary
According to an aspect, a bias controller for biasing a power amplifier in an electronic system comprising, a current sensor operative to sense a current flowing through the power amplifier, the current sensor exhibiting an offset error characteristic that is non linear over a first range of power supply voltages and a first set of offsets matching with the offset error characteristic over a second range of power supply voltages that are within the first range of power supply voltages, in that, the first set of offsets are applied for correcting the offset errors of the current sensor when the power amplifier is subjected to the second range of power supply voltages.