Richard Keith Pierson

US Patent:

6407875, Jun 18, 2002

Filed:

Jun 16, 1998

Appl. No.:

09/098308

Inventors:

Richard C. Pierson - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G11B 509

US Classification:

360 46, 360 65, 333 28 R

Abstract:

An apparatus for filtering an input signal includes a first second order filter section having an output and an intermediate output, a second second order filter section having an input connected to the output of the first second order filter, and a gain stage coupling the output of the first second order filter section and the intermediate output of the first second order filter section to the output of the second second order filter section. The gain stage is coupled such that a transfer function between the output of the second second order filter section and the input of the second second order filter section is a biquadratic transfer function.

US Patent:

58050019, Sep 8, 1998

Filed:

Jun 13, 1996

Appl. No.:

8/665145

Inventors:

Benjamin Joseph Sheahan - Dallas TX
Richard Charles Pierson - Dallas TX

Assignee:

Texas Instruments Instruments Incorporated - Dallas TX

International Classification:

H03L 700

US Classification:

327142

Abstract:

A circuit provides a restart signal to indicate a zero crossing of a continuous varying signal. A zero phase signal is generalized based on a zero crossing of the continuous varying signal. The continuous varying signal is sampled and held in accordance with the zero crossing. The continuous varying signal is converted to complementary signals, and these complementary signals are in turn converted to a signal appropriate for CMOS circuits.

US Patent:

59125837, Jun 15, 1999

Filed:

Dec 30, 1997

Appl. No.:

9/000826

Inventors:

Richard C. Pierson - Dallas TX
Srinivasan Venkatranan - Bangalore, IN

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02M 700

US Classification:

327553

Abstract:

A transconductor is provided having a transconductance G. sub. m. This transconductance is then attenuated with a steering circuit (41) to attenuate the overall transconductance of the transconductor and vary the bandwidth. A fixed voltage is then input to the transconductor with the output thereof offset with a programmable current DAC (48). This output is then provided to an error amplifier (46) for developing an error voltage. This error voltage is then input back to the input of the transconductor to adjust the transconductance thereof to minimize this error. The steering circuit (41) is controlled by a voltage DAC (58) to program the attenuation provided thereby. Both the voltage DAC (58) and the current DAC (48) are controlled by a bandwidth control signal to program the bandwidth of the overall transconductor. This is facilitated while compensating for the process and temperature variations of the transconductance of the transconductor. This is also facilitated with a master/slave relationship.

US Patent:

62952102, Sep 25, 2001

Filed:

Apr 7, 2000

Appl. No.:

9/544748

Inventors:

Chris Allan Lanzone - Rockwall TX
Richard A. Pierson - Rockwall TX
Andrea T. Sandage - Mesquite TX

Assignee:

Lucent Technologies, Inc. - Murray Hill NJ

International Classification:

H05K 900

US Classification:

361799

Abstract:

A printed wiring board is adapted to be mounted to a chassis using a fastener. The chassis provides an electrical ground for the printed wiring board. The board includes first and second sides and a mounting aperture extending therethrough for receiving the fastener. A plurality of spaced apart solder pads are disposed on one side of the board and adjacent to the mounting aperture. The pads are adapted to provide an electrical connection to the chassis. At lease one aperture is disposed in each of the plurality of pads. The aperture is plated creating an electrical connection between the sides of the board.

US Patent:

57966729, Aug 18, 1998

Filed:

Apr 24, 1997

Appl. No.:

8/842342

Inventors:

Jeanne K. Pitz - Richardson TX
Fredrick W. Trafton - Lewisville TX
Richard C. Pierson - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G11C 800

US Classification:

36523003

Abstract:

A method and circuit for routing data to registers in an integrated circuit is disclosed. The circuit comprises an I/O port (100) for receiving data and address signals, and a plurality of distributed memory modules (200-900) having registers (210-217). Each memory module is associated with and located adjacent to a circuit functional block. All of the memory modules (200-900) are connected to the I/O port (100) via a single data bus (40).

US Patent:

58444262, Dec 1, 1998

Filed:

Jun 13, 1996

Appl. No.:

8/665144

Inventors:

Benjamin Joseph Sheahan - Dallas TX
Richard Charles Pierson - Dallas TX

Assignee:

Texas Intruments Incorporated - Dallas TX

International Classification:

H03K 190175
H03K 19082
H03K 19094

US Classification:

326 80

Abstract:

A level shift is provided between a first level and a second level for a first and second compensatory signal. Power supply variations are measured and the levels are compensated for these power supply variations so that the power supply does not affect the first and second levels.

US Patent:

60695226, May 30, 2000

Filed:

Feb 2, 1998

Appl. No.:

9/016907

Inventors:

Srinivasan Venkatraman - Bangalore, IN
Richard C. Pierson - Dallas TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03K 500

US Classification:

327552

Abstract:

A capacitor current sensing circuitry (100) for sensing the current through a bandpass capacitor (20) of a first biquad stage (80) and generating an output current in response. The capacitor current sensing circuitry (100) includes a differential input circuit comprising a transistor (123) and a transistor (124), a fixed current source (130), a variable current source (120), a variable current, source (122), an input current sink (126), a differential output circuit comprising a transistor (132) and a transistor (134), and a programmable output current sink (138). The differential input circuit receives an input sense voltage and generates a first input current, a second input current, a first output voltage, and a second output voltage in response. The fixed current source (130) generates a current that is used to provide a first current component to the first input current and a first current component to the second input current. The variable current source (120) and the variable current source (122) generate a second component of the first input current and the second input current, respectively.