Gabriel Gomez

US Patent:

6621441, Sep 16, 2003

Filed:

May 7, 2001

Appl. No.:

09/850435

Inventors:

Baher S. Haroun - Allen TX
Gabriel J. Gomez - Plano TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M 112

US Classification:

341155, 341172

Abstract:

An analog signal (V ) is converted into a digital signal ( ) by sampling the analog signal at a plurality of points in time to produce a sampled signal ( ) which represents the analog signal. A filtering operation is advantageously incorporated into the sampling operation ( ). The filtering operation filters the analog signal such that the sampled signal represents a filtered version of the analog signal. The digital signal is produced from the sampled signal.

US Patent:

6674381, Jan 6, 2004

Filed:

Feb 28, 2003

Appl. No.:

10/377222

Inventors:

Gabriel J. Gomez - Plano TX
Baher S. Haroun - Allen TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M 300

US Classification:

341143, 341144, 341155

Abstract:

Sigma delta modulators and digital to analog converters therefor are disclosed, in which intentional mismatch is provided in circuit elements of the digital to analog converter to facilitate tone reduction where dynamic element matching is used in selecting the digital to analog converter circuit elements. Methods are disclosed for fabricating digital to analog converters for providing analog feedback using a group of circuit elements selected according to a quantized output signal in a sigma delta modulator, in which a plurality of matched circuit elements having values within a tolerance amount of a design value are provided in the group along with at least one mismatched circuit element having a mismatched element value differing from the design value by a mismatch amount, where the mismatch amount is greater than the tolerance amount.

US Patent:

7129875, Oct 31, 2006

Filed:

Jul 8, 2005

Appl. No.:

11/178191

Inventors:

Oguz Altun - Richardson TX, US
Vijaya B. Rentala - Plano TX, US
Gabriel J. Gomez - Plano TX, US
Baher S. Haroun - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M 3/00

US Classification:

341143, 341120

Abstract:

An analog-to-digital (A/D) converter system is provided that compensates for operating variations associated with one or more passive components of the A/D converter. In one aspect of the present invention, the A/D converter system comprises a sigma delta modulator having at least one passive component and a feedback path that includes at least one switched digital-to-analog converter (DAC), and a tracking reference generator that provides compensated reference signals to the at least one switched DAC for providing feedback to the sigma delta modulator. The compensated reference signals include inverse variations that cancel operating variations associated with the at least one passive component.

US Patent:

20090159967, Jun 25, 2009

Filed:

Dec 19, 2007

Appl. No.:

11/959921

Inventors:

Henry Litzmann Edwards - Garland TX, US
Tathagata Chatterjee - Allen TX, US
Mohamed Kamel Mahmoud - Wylie TX, US
Gabriel J. Gomez - Plano TX, US

International Classification:

H01L 29/78

US Classification:

257335, 257E29256

Abstract:

One embodiment of the invention relates to a semiconductor device formed over a semiconductor body. In this device, source and drain regions are formed in the body about lateral edges of a gate electrode and are separated from one another by a gate length. A channel region, which is configured to allow charged carriers to selectively flow between the source and drain regions during operation of the device, has differing widths under the gate electrode. These widths are generally perpendicular to the gate length. Other devices, methods, and systems are also disclosed.

US Patent:

63269112, Dec 4, 2001

Filed:

Nov 5, 1998

Appl. No.:

9/186559

Inventors:

Gabriel J. Gomez - Plano TX
Jenn-Yu G. Lin - Plano TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M 300
H03M 120

US Classification:

341143

Abstract:

A method and apparatus for dithering idle channel tones in delta-sigma converters is provided. In a delta-sigma modulator (10), random dither signal (23) is added before quantizing a signal in order to attenuate the idle channel tones. A random number generator (50) coupled to a digital-to-analog converter (52) with an applied biasing current (54) produces the dither signal (23). The dither signal (23) combines with an input signal at the input of a quantizer (14) in order to randomly change the quantizer output (15) and attenuate idle channel tones.