Inventors:
- San Diego CA, US
Miles Sanner - San Diego CA, US
Ke Li - San Diego CA, US
James Francis McElwee - Austin TX, US
Tero Tapio Ranta - San Diego CA, US
Kevin Roberts - Rohnert Park CA, US
Chih-Chieh Cheng - Poway CA, US
International Classification:
H03H 7/01
H04B 1/00
H04W 72/04
Abstract:
A flexible multi-path RF adaptive tuning network switch architecture that counteracts impedance mismatch conditions arising from various combinations of coupled RF band filters, particularly in a Carrier Aggregation-based (CA) radio system. In one version, a digitally-controlled tunable matching network is coupled to a multi-path RF switch in order to provide adaptive impedance matching for various combinations of RF band filters. Optionally, some or all RF band filters include an associated digitally-controlled filter pre-match network to further improve impedance matching. In a second version, some or all RF band filters coupled to a multi-path RF switch include a digitally-controlled phase matching network to provide necessary per-band impedance matching. Optionally, a digitally-controlled tunable matching network may be included on the common port of the multi-path RF switch to provide additional impedance matching capability. In a third version, CA direct mapped adaptive tuning networks include filter tuning blocks for selected lower frequency bands.