Switchless Carrier Aggregation Circuit for Low-Noise RF Isolation

The patent extracts and removes the switches from the RF signal paths entirely. Instead of using switches to isolate signal paths, the design employs separate LNAs and filters for each frequency band, eliminating the need for switching mechanisms while maintaining path isolation through physical separation and frequency-selective filtering.

The patent segments the RF receiver into multiple independent signal paths, each with its own LNA and filter dedicated to a specific frequency band. This segmentation allows simultaneous operation on multiple bands without requiring switches to route signals, as each band has its own dedicated processing path.

The switches that would degrade noise figure are extracted and removed from the signal path. Frequency band isolation is achieved through dedicated filters for each band rather than through switching mechanisms, eliminating the noise contribution from switch operations.

The receiver is segmented into independent parallel paths, each with its own LNA and band-specific filter. This allows simultaneous reception of multiple frequency bands without the need for switching, thereby maintaining low noise figure while achieving frequency isolation through filtering.

The patent merges multiple frequency band processing paths into a single integrated receiver architecture. By using a common RF input stage and combining the signal paths after filtering, the design achieves frequency isolation without requiring completely separate LNA circuits for each band, thereby reducing overall device size and cost.

The receiver employs a universal common input stage and signal processing path that can handle multiple frequency bands simultaneously. Each band uses dedicated filters but shares the common LNA and subsequent processing stages, providing multi-functionality that reduces the total number of components needed.