Digital Predistortion Feedback Filtering for Wideband RF Amplifiers

The patent segments the wideband signal processing into multiple narrowband parallel channels. Each channel is processed independently at a lower sampling rate, then combined to achieve the overall wideband effect. This allows the system to handle wide instantaneous bandwidth (e.g., 50 MHz) without requiring proportionally high sampling rates for the entire bandwidth, thus reducing power consumption while maintaining processing capability.

The patent transforms the problem from a single-dimensional high-speed processing approach to a multi-dimensional parallel processing architecture. By dividing the frequency spectrum into multiple sub-bands and processing them in parallel at reduced rates, the system achieves equivalent overall processing speed without the cubic power increase that would result from uniformly increasing the sampling rate across the entire bandwidth.

The system divides the wideband signal path into multiple narrowband parallel channels, each handled by separate processing chains operating at lower sampling rates. This segmentation allows the use of simpler, lower-cost components in each channel while achieving aggregate wideband performance, thereby reducing overall system complexity and cost.

The patent creates a multi-functional processing architecture where identical narrowband processing modules can be reused across multiple frequency channels. This universal module approach reduces design complexity and allows the same hardware blocks to serve multiple functions across different bands, simplifying the overall system architecture.