Paul T Chan

US Patent:

6774508, Aug 10, 2004

Filed:

Jul 3, 2001

Appl. No.:

09/898680

Inventors:

Gary J. Ballantyne - Christchurch, NZ
Paul L. Chan - Encinitas CA
Jonathan Klaren - San Diego CA
Charles J. Persico - Rancho Santa Fe CA
Walter Scott Charles - San Diego CA
Somphou Sithideth - Spring Valley CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H02J 300

US Classification:

307 85

Abstract:

A battery ( ) powers a wireless telephones power amplifier ( ) through a Switch Mode Power Supply (SMPS) ( ). The SMPS has a capacity lower than the maximum power requirements of the amplifier. When a controller ( ) senses that an amplifier power-requirement threshold has been exceeded, it closes a switch ( ) parallel to the SMPS, allowing power to flow from the battery to the amplifier without passing through the SMPS. This architecture allows the use of a smaller SMPS, and eliminates SMPS-generated noise to the amplifier when the amplifier is least able to tolerate such noise, namely, under high power conditions.

US Patent:

6806768, Oct 19, 2004

Filed:

Oct 31, 2001

Appl. No.:

10/039936

Inventors:

Jonathan Klaren - San Diego CA
Charles J. Persico - Rancho Santa Fe CA
Scott Walter - San Diego CA
Paul L. Chan - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H03F 368

US Classification:

330124R, 330 51

Abstract:

A balanced power amplifier circuit arrangement comprises a driver amplifier stage ( ) adapted to receive and amplify a signal. The amplified signal is input to a first coupler ( ). The first coupler ( ) produces an in-phase signal and an out-of-phase quadrature signal. A first power amplifier ( ) receives and amplifies the in-phase signal. A second power amplifier ( ) receives and amplifies the out-of-phase signal. A first switch ( ) alternately connects an isolated port of the first coupler to ground ( ) or a bypass path ( ). A second coupler ( ) receives and combines the amplified in-phase signal and the amplified out-of-phase signal to produce a combined signal. A second switch ( ) alternately connects an isolated port of the second coupler ( ) to either ground ( ) or the bypass path ( ). When the power amplifiers ( ) are powered down, the first coupler ( ) splits the RF-signal into an in-phase signal and an out-of-phase signal. The power amplifiers ( ) appear as reflective impedances to the signal when they are powered down.

US Patent:

20030114182, Jun 19, 2003

Filed:

Jan 16, 2002

Appl. No.:

10/051792

Inventors:

Paul Chan - Encinitas CA, US
Jonathan Klaren - San Diego CA, US
Charles Persico - Rancho Sante Fe CA, US
Scott Walter - San Diego CA, US

International Classification:

H04B007/00

US Classification:

455/525000, 455/067100, 455/343000, 455/127000

Abstract:

Power detectors sense load mismatch conditions and cause the power output of a power amplifier to be reduced in response to a load mismatch. Transmitted and reflected power measurements are used to calculate a load mismatch criterion. A power amplifier is configured based on the calculated load mismatch criterion. A dual-directional coupler may be used to separate a power signal into transmitted and reflected components. With output power reduced under load mismatch conditions, signal distortion levels may be reduced to acceptable levels.