Christopher A Riddle

6483817, Nov 19, 2002

Oct 14, 1998

09/172332

Franklin Antonio - Del Mar CA
Christopher C. Riddle - San Diego CA

Qualcomm Incorporated - San Diego CA

H04J 100

370328, 370335, 370342, 370537

A base station architecture splits modem functionality into modulator and demodulator entities, each configured to handle multiple telephone calls. A high-speed digital bus with associated routing elements connects multiple-channel (i. e. , multiuser) modulator and demodulator elements. The modulator and demodulator elements may be physically separated, residing on different cards, and even different shelves, within the base station. On each modulator card, the outputs of multiple modulators may be combined by digitally upconverting the output of each modulator by a different amount and summing the results.

6600792, Jul 29, 2003

Jun 26, 1998

09/105532

Franklin P. Antonio - Del Mar CA
Walid Hamdy - San Diego CA
Nitin Kasturi - Los Gatos CA
Christopher C. Riddle - San Diego CA
David P. Oses - San Diego CA

Qualcomm Incorporated - San Diego CA

H04L 2549

375297, 330149, 455126

A predistortion technique for high power amplifiers includes an adaptive predistortion algorithm that operates independently of data samples to write a set of complex gain values, or predistortion parameters, to a lookup table. The algorithm may be processor-driven. The gain values are taken from the lookup table and multiplied by a complex digital baseband waveform. The gain values may first be subjected to interpolation. The downconverted output of the amplifier is measured to gauge the efficacy of the predistortion. Based on the effect of the predistortion upon the ratio of in-band power to out-of-band power, decisions are made on the set of predistortion parameters for the next iteration of the algorithm. The algorithm runs continuously, perturbing parameters and adapting the predistortion functions accordingly in an effort to continually reflect instantaneous amplitude-modulation and phase-modulation relationships that may change over time with temperature variation or component aging.

7812582, Oct 12, 2010

Sep 14, 2006

11/532000

Lew G. Chua-Eoan - Carlsbad CA, US
Boris Andreev - San Diego CA, US
Christopher C. Riddle - San Diego CA, US
Chunlei Shi - Poway CA, US
Justin Joseph Rosen Gagne - San Diego CA, US
Seong-Ook Jung - Goyang-Si, KR
Thomas R. Toms - Dripping Springs TX, US

QUALCOMM Incorporated - San Diego CA

G05F 1/40

323282

A device is disclosed that includes a first pin to supply power to a first power domain of an integrated circuit, a second pin to supply power to a second power domain of the integrated circuit, a switching regulator and a controller. The switching regulator is coupled to the first pin to provide a first regulated power supply to the first power domain and is coupled to the second pin to provide a second regulated power supply to the second power domain. The controller is coupled to the first pin and to the second pin to selectively reduce current flow to at least the second pin during a low power event.

8014476, Sep 6, 2011

Nov 7, 2005

11/269360

Daniel F. Filipovic - Solana Beach CA, US
Charles J. Persico - Rancho Santa Fe CA, US
Christopher C. Riddle - San Diego CA, US

QUALCOMM, Incorporated - San Diego CA

H04L 27/06

375344, 375355

A wireless device achieves good performance using a crystal oscillator that is not compensated for temperature. The crystal oscillator provides a reference signal having a temperature dependent frequency error. A control unit estimates the frequency error (e. g. , based on a received pilot) and provides a frequency error estimate. A clock generator generates a digital clock, which tracks chip timing, based on the reference signal and the frequency error estimate. A receiver frequency downconverts an input RF signal with a receive LO signal having the frequency error and provides an analog baseband signal. An ADC digitizes the analog baseband signal based on a sampling clock having the frequency error and provides ADC samples. A re-clocking circuit re-clocks the ADC samples based on a digital clock and provides data samples. A digital rotator frequency translates the data samples based on the frequency error estimate and provides frequency-translated samples centered near DC.