Abidur M Rahman

US Patent:

7236003, Jun 26, 2007

Filed:

Sep 29, 2005

Appl. No.:

11/239021

Inventors:

Shanmuganand Chellamuthu - Richardson TX, US
Brett E. Smith - McKinney TX, US
Thomas A. Schmidt - Murphy TX, US
Abidur Rahman - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03K 19/007

US Classification:

326 14, 326 27, 363 50

Abstract:

The H-bridge circuit with shoot through current prevention during power-up includes: a high side transistor; a low side transistor coupled in series with the high side transistor; pull down devices coupled to a control node of the high side transistor and to a control node of the low side transistor; and wherein the pull down devices are controlled by a pull down circuit including a Power On Reset circuit, monitoring the digital power supply such that the high side and low side transistors are OFF until the digital power supply has settled to a desired operating voltage.

US Patent:

7560972, Jul 14, 2009

Filed:

Jan 29, 2008

Appl. No.:

12/021939

Inventors:

Kee Chee Tiew - Richardson TX, US
Brett Smith - McKinney TX, US
Abidur Rahman - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03L 5/00

US Classification:

327333, 326 81

Abstract:

Methods and apparatus to reduce propagation delay of circuits are disclosed. A disclosed apparatus to reduce propagation delay of a circuit comprises a level shifter to selectively turn a first circuit on and off; a first switch to couple the first circuit to a second circuit when the first circuit is on, wherein the second circuit is to selectively receive a first current from the first circuit based on a signal the second circuit receives from the level shifter; and a second switch to couple the first circuit to a reference signal based on the first current, the second switch causing the first circuit to start to turn off.

US Patent:

7843207, Nov 30, 2010

Filed:

Dec 29, 2008

Appl. No.:

12/345419

Inventors:

Abidur Rahman - Allen TX, US
Chris Vogel - Wylie TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G01R 31/26

US Classification:

324765, 324769

Abstract:

Methods and apparatus to test electronic devices are disclosed. An example method includes setting a first controlled switch to prevent a current detect signal from tripping an overcurrent protection event controlling an operation of the device; setting a second controlled switch to route a first sensed voltage associated with the device to a voltage adjuster; sending a calibration current corresponding to a target threshold current through the device; detecting the first sensed voltage while the calibration current flows through the device; and setting a reference signal substantially equal to the first sensed voltage, wherein the reference signal is to be used to generate the current detect signal.

US Patent:

7928784, Apr 19, 2011

Filed:

Jun 26, 2009

Appl. No.:

12/492252

Inventors:

Huijuan Li - Plano TX, US
Abidur Rahman - Allen TX, US
Chienyu Huang - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03K 5/12

US Classification:

327170, 327261

Abstract:

A circuit for independently controlling slew and propagation delay of a current DAC is provided. The circuit applies dual slope technique with feed-back control the gate (or control electrode) of a switching transistor to make propagation delay independent control from rise/fall slew rate. This allows one to adjust propagation delay and current slew rate separately to achieve better performance.

US Patent:

8143812, Mar 27, 2012

Filed:

Jun 25, 2009

Appl. No.:

12/491609

Inventors:

Chienyu Huang - Plano TX, US
Abidur Rahman - Allen TX, US
Huijuan Li - Plano TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H05B 37/02

US Classification:

315297, 315307, 345204

Abstract:

An output stage for an LED driver is provided. In particular, a low voltage clamp, which uses several cascode circuits, is provided to protect low voltage switching transistors in the range of two times higher voltage application under both normal and fault conditions. Additionally, a circuit for regulating the bias voltage applied to each of the cascode circuits is provided to prevent damage during startup, while an internal voltage regulator is settling.

US Patent:

8492925, Jul 23, 2013

Filed:

Aug 24, 2010

Appl. No.:

12/862511

Inventors:

Gowtham Vemulapalli - Murphy TX, US
Rakesh Raja - Allen TX, US
Abidur Rahman - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02J 1/10

US Classification:

307 43, 307 52, 307 87, 327110, 327309, 327318, 327321, 327322, 327327, 327328, 327347, 330253

Abstract:

Conventional circuits often have undesirable characteristics to due “hot spots” or use a large amount of area. Here, however, a charging circuit is provides that uses an improved driver. Namely, an amplifier within a current sensor is used to control the rate that a switch can charge an external capacitor. This is accomplished through the adjustment of the gain of the amplifier during a charging mode.

US Patent:

8531056, Sep 10, 2013

Filed:

May 13, 2010

Appl. No.:

12/779418

Inventors:

Abidur Rahman - Allen TX, US
Xiaochun Zhao - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02J 1/10

US Classification:

307 43

Abstract:

Generally, with low drop out (LDO) regulators that use multiplexed power supplies, the transistors within the regulator can use a substantial amount of area. Here, a regulator is provided that uses a multiplexer to commonly control the back-gates of multiple power transistors within the LDO. By doing this, the area overhead that would normally be present with these switches (of the multiplexer) can be dramatically reduced without sacrificing performance.

US Patent:

8552898, Oct 8, 2013

Filed:

Dec 30, 2011

Appl. No.:

13/341501

Inventors:

Jim Kien Huy Le - Fairview TX, US
Abidur Rahman - Allen TX, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H03M 1/78

US Classification:

341154, 341144

Abstract:

A circuit has a digital to analog (DA) resistance ladder having an analog output; a capacitor coupled to the analog output; a first resistance coupled from the capacitor to ground; and a switch coupled to the capacitor in parallel to the resistor, wherein the switch, when closed, has a second resistance, and the first resistance is greater than the second resistance.