Power Amplifier Bias Calibration for Linearity-Efficiency Balance

The patent applies preliminary action by performing power amplifier calibration before deployment to establish optimal bias settings. The calibration circuit pre-determines the relationship between bias signals and performance parameters (IMD3, ACPR), storing this data for later use. This preliminary characterization allows the amplifier to operate at optimal points that balance coverage and linearity without requiring real-time adjustments during operation.

The patent utilizes parameter changes by systematically varying bias signal parameters (first and second bias signals) during calibration to observe their effect on performance parameters. By changing these electrical parameters and mapping their relationships, the system identifies optimal operating points that achieve both adequate coverage and acceptable linearity, resolving the contradiction between coverage range and linearity.

The patent implements feedback by using the calibration circuit to measure performance parameters (IMD3, ACPR) resulting from different bias signal combinations, then using this measured data to determine optimal settings. The system feeds back the relationship between bias signals and performance metrics, allowing selection of operating points that achieve acceptable linearity while maintaining reasonable efficiency, rather than simply maximizing one parameter at the expense of the other.

The patent applies parameter changes by exploring multiple bias signal configurations and their corresponding performance characteristics. Rather than fixing bias at a single value, the system varies bias parameters during calibration to map the trade-off curve between linearity and efficiency, then selects an optimal operating point that balances both requirements based on specific application needs.

The patent applies segmentation by dividing the calibration process into discrete, manageable steps: generating individual bias signal combinations, measuring corresponding performance parameters, and storing results in a structured manner. The calibration circuit breaks down the complex optimization problem into systematic evaluation of individual bias pairs, making the process manageable and automated rather than requiring complex real-time optimization algorithms.

The patent implements self-service through automated calibration where the calibration circuit independently performs measurements and determines optimal settings without requiring manual intervention. The system self-characterizes the power amplifier by automatically sweeping through bias combinations, measuring performance parameters, and storing the results for future use, reducing calibration complexity while maintaining high performance.