Multi-Band Power Amplifier Impedance Tuning for Carrier Aggregation

The patent introduces a switching mechanism that dynamically reconfigures the output terminal connections based on the operating mode (single-band or carrier aggregation). The switch can connect the power amplifier output to different filter circuits depending on which frequency bands are being used, thereby dynamically adapting the impedance matching conditions to maintain high amplification efficiency across different operational states.

The patent applies different filtering characteristics to different frequency bands by connecting the power amplifier output to specific filter circuits based on the active carrier bands. Each filter circuit is optimized for specific frequency ranges, allowing the system to maintain optimal impedance matching and signal quality for each local frequency band while supporting multi-band operation.

The patent designs filter circuits that can serve multiple functions: they act as band-selective filters for carrier aggregation mode and as impedance matching networks for single-band mode. The same physical filter circuits are reused across different operational contexts, reducing the need for separate dedicated components for each function and thereby limiting the increase in device complexity.

The patent pre-configures multiple filter circuits with different frequency characteristics before operation begins. When carrier aggregation or single-band mode is activated, the appropriate pre-configured filter circuit is already in place and can be quickly connected via the switching mechanism, eliminating the need for complex real-time filter synthesis or reconfiguration during operation.