Multiband Booster Feedback Cancellation Circuit

The patent combines multiple feedback cancellation functions into a single integrated circuit that can handle multiple frequency bands simultaneously. The circuit uses a shared architecture with band-specific filtering and processing stages, allowing one circuit to perform the work of what would traditionally require multiple separate circuits, thereby reducing overall device complexity while maintaining comprehensive feedback cancellation capability.

The feedback cancellation circuit is designed with universal functionality to operate across multiple frequency bands (e.g., Band 12, Band 13, Band 66) using a common signal processing architecture. The circuit incorporates configurable filters and adjustable parameters that allow it to adapt to different band requirements, making a single circuit capable of performing multiple band-specific feedback cancellation tasks that would otherwise require separate dedicated circuits.

The patent introduces an intermediary feedback cancellation circuit positioned between the antenna ports and the signal processing stages. This intermediary circuit captures feedback signals early in the signal path, processes them through configurable filters and cancellation algorithms, and injects cancellation signals back into the appropriate signal paths. By acting as an intermediary, the circuit effectively reduces antenna-to-antenna feedback while maintaining signal integrity through controlled signal injection points rather than direct antenna port manipulation.

The feedback cancellation circuit extracts feedback signals from the main signal path at strategic points where they can be processed and cancelled without significantly interfering with the primary signal flow. The circuit separates feedback components from desired signals using filtering techniques, processes only the harmful feedback portions, and selectively cancels them while preserving the integrity of the main communication signals.

The patent implements dynamically adjustable filtering and signal processing parameters within the feedback cancellation circuit. The circuit includes configurable filters with adjustable center frequencies, bandwidths, and Q-factors that can be programmed to match different frequency band requirements (Band 12, Band 13, Band 66, etc.). This dynamic configurability allows the same hardware to adapt to multiple bands without requiring extremely tight manufacturing tolerances, as the parameters can be tuned through software or configuration registers after manufacturing.

The feedback cancellation circuit utilizes programmable parameters including filter coefficients, gain values, and frequency settings that can be adjusted to optimize performance across different frequency bands. By changing these parameters through software configuration rather than relying solely on fixed physical components, the circuit achieves wideband multiband coverage with relaxed manufacturing precision requirements, as parameter adjustments can compensate for manufacturing variations.