Sudhakar Sudhakar Kalakota

US Patent:

20110037506, Feb 17, 2011

Filed:

Aug 11, 2009

Appl. No.:

12/539504

Inventors:

Sudhakar Kalakota - Santa Clara CA, US
Mingdeng Chen - Palo Alto CA, US

Assignee:

QUALCOMM INCORPORATED - San Diego CA

International Classification:

H03L 5/00

US Classification:

327307

Abstract:

Exemplary techniques for DC offset calibration for complex filters are disclosed. A complex filter is provided having a first calibration path circuit and a second calibration path circuit, each including a first and a second set of switches, respectively. The first set of switches is enabled during calibration mode and the second set of switches is enabled during normal operation mode such that the network characteristics of each calibration path circuit are substantially the same during both modes of operation. In one embodiment, the complex filter is a low pass filter.

US Patent:

20130337755, Dec 19, 2013

Filed:

Jun 19, 2012

Appl. No.:

13/526825

Inventors:

Thinh Nguyen - Santa Clara CA, US
Arvind Keerti - Santa Clara CA, US
Sudhakar Kalakota - Santa Clara CA, US
Rainer Gaethke - Santa Clara CA, US

Assignee:

QUALCOMM INCORPORATED - San Diego

International Classification:

H04B 1/04

US Classification:

4551151, 455 91

Abstract:

A multipath circuit is described that has multiple signal paths and various common components used for normal operation. Each of the multiple signal paths also has multiple circuit blocks defining the functionality of the signal path. A shared access path is provided through the third winding of a three-way transformer for each signal path. Multiple switches are provided in the multipath circuit that couple to the third winding in each of the multiple signal paths. The switches are also coupled to the various common components. Selected ones of these switches may be closed to provide a shared access path between a common component and one of the signal paths or between a common components and one of the circuit blocks in one of the signal paths.