Dong F Zhang

US Patent:

20150042412, Feb 12, 2015

Filed:

Aug 7, 2013

Appl. No.:

13/961861

Inventors:

- San Diego CA, US
Yanjie Sun - Boxborough MA, US
Zhenying Luo - Boxborough MA, US
Zhenqi Chen - Acton MA, US
Calogero D. Presti - San Diego CA, US
Xinwei Wang - Dunstable MA, US
Dong Zhang - Boxborough MA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03H 7/48
H01P 5/18

US Classification:

333112

Abstract:

Techniques for efficiently integrating directional coupler circuitry with other circuit elements of an RF front end. In an aspect, one or more inductors of an RF front end filter is incorporated into a first inductor of the directional coupler, and a capacitor is further coupled in parallel with the first inductor. In another aspect, circuitry associated with matching components of the RF front end may further be incorporated into the directional coupler design. Further techniques are provided for coupling directivity tuning elements to a second inductor of the directional coupler to improve the linearity of the coupler over other tuning techniques.