Richard Charles 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:

6570406, May 27, 2003

Filed:

Nov 13, 2001

Appl. No.:

10/010825

Inventors:

Benjamim Tang - Hawthorne CA
Richard C. Pierson - Newport Beach CA

Assignee:

Primarion, Inc. - Tempe AZ

International Classification:

H03K 19003

US Classification:

326 86, 326 26, 326 27, 326 29

Abstract:

A method and circuit for pre-emphasis equalization of a high speed data communication system can be provided through the use of programmable pulse shaping. A data communication system configured with the pre-emphasis equalization circuit operates by receiving an input data stream and outputting a data stream for transmission through an interconnect or other transmission channel. The data can be passed through an output buffer configured with programmable pre-emphasis equalization, having input inverters at an input stage and output inverters at an output stage. During operation, once an input signal to the input stage transitions, for example from a low to a high state, an input signal to the output stage is configured to a full amplitude to drive the transmission channel. Once the output stage transitions to a full amplitude, the input of the output stage is configured closer to a mid-scale amplitude. The amount of amplitude change from full scale back to mid-scale determines the amount of equalization to be provided by the output buffer to the transmission channel.

US Patent:

6794900, Sep 21, 2004

Filed:

Jul 24, 2002

Appl. No.:

10/205340

Inventors:

Benjamim Tang - Hawthorne CA
Richard C. Pierson - Newport Beach CA

Assignee:

Primarion, Inc. - Tempe AZ

International Classification:

H03K 19003

US Classification:

326 86, 326 26, 326 27, 326 29

Abstract:

A method and circuit for pre-emphasis equalization of a high speed data communication system can be provided through the use of programmable pulse shaping. A data communication system configured with the pre-emphasis equalization circuit operates by receiving an input data stream and outputting a data stream for transmission through an interconnect or other transmission channel. The data can be passed through an output buffer configured with programmable pre-emphasis equalization, having input inverters at an input stage and output inverters at an output stage. During operation, once an input signal to the input stage transitions, for example from a low to a high state, an input signal to the output stage is configured to a full amplitude to drive the transmission channel. Once the output stage transitions to a full amplitude, the input of the output stage is configured closer to a mid-scale amplitude. The amount of amplitude change from full scale back to mid-scale determines the amount of equalization to be provided by the output buffer to the transmission channel.

US Patent:

7492134, Feb 17, 2009

Filed:

Jul 3, 2006

Appl. No.:

11/480715

Inventors:

Benjamim Tang - Rancho Palos Verdes CA, US
Robert T. Carroll - Andover MA, US
Nicholas R. Steffen - Redondo Beach CA, US
Richard C. Pierson - Newport Beach CA, US

Assignee:

Primarion, Inc. - Tempe AZ

International Classification:

G05F 1/00

US Classification:

323241, 323283

Abstract:

Disclosed is a power regulator for providing precisely regulated power to a microelectronic device such as a microprocessor. Improved power regulation is accomplished by optimizing the power efficiency of the power regulator. In particular, in a multiphase system, the number of active phases is increased or decreased to achieve optimum power efficiency. The multiphase voltage regulator adapts the operating mode to maximize efficiency as the load current demand of the load device changes by adjusting the number of active phases to maximize efficiency. The total value of current provided by the regulator and the total number of active phases is determined, the total number of active phases is compared with the number of active phases required to provide the total value of current at maximum efficiency; and the number of active phases is adjusted to provide the total value of current at maximum efficiency. A current sense circuit senses the current at each phase, a summing circuit coupled to the output of the current sense circuit provides the total current value of all the measured phases, a circuit coupled to the output of the summing circuit provides the time averaged total current value to a threshold detecting circuit that determines the number of phases at which the voltage regulator should be operating for maximum efficiency, and a circuit for comparing the number of phases that are operating to the number of phases at which the voltage regulator should be operating adjusts the number of active phases to the number of phases at which the voltage regulator should be operating for maximum efficiency.

US Patent:

7521913, Apr 21, 2009

Filed:

Dec 19, 2005

Appl. No.:

11/311115

Inventors:

Benjamim Tang - Rancho Palos Verdes CA, US
Robert T. Carroll - Andover MA, US
Scott Wilson Southwell - Seal Beach CA, US
Kenneth A. Ostrom - Palos Verdes Estates CA, US
Richard C. Pierson - Newport Beach CA, US

Assignee:

Primarion Corporation - Torrance CA

International Classification:

G05F 1/618

US Classification:

323283, 323272, 323284

Abstract:

Disclosed is a multi-phase pulse width modulated voltage regulator and method in which transient voltage excursions or deviations that exceed the load line voltage by more than a pre-determined amount are detected by an ATR circuit and a correction signal is applied. The correction signal is in the form of asynchronous pulses and the number of such pulses is a function of the magnitude of the voltage excursion as determined by the number of thresholds that are exceeded. Also disclosed is an adaptive voltage positioning (AVP) circuit and method for early detection of a transient event by sensing voltage changes at the load and adjusting the target voltage with pre-determined current values prior to the time that ATR event changes in the current at the load are detected. The AVP load line is pre-positioned for more precise current control. Also disclosed is an adaptive filter with adjustable frequency characteristics in response to an ATR event.

US Patent:

8134354, Mar 13, 2012

Filed:

Mar 3, 2009

Appl. No.:

12/396975

Inventors:

Benjamim Tang - Ranchos Palos Verdes CA, US
Robert T. Carroll - Andover MA, US
Scott W. Southwell - Seal Beach CA, US
Kenneth A. Ostrom - Palos Verdes Estates CA, US
Richard C. Pierson - Newport Beach CA, US

International Classification:

G05F 1/59

US Classification:

323283, 323272, 323284

Abstract:

Disclosed is a multi-phase pulse width modulated voltage regulator and method in which transient voltage excursions or deviations that exceed the load line voltage by more than a predetermined amount are detected by an ATR circuit and a correction signal is applied. The correction signal is in the form of asynchronous pulses and the number of such pulses is a function of the magnitude of the voltage excursion as determined by the number of thresholds that are exceeded. Also disclosed is an adaptive voltage positioning (AVP) circuit and method for early detection of a transient event by sensing voltage changes at the load and adjusting the target voltage with pre-determined current values prior to the time that ATR event changes in the current at the load are detected. The AVP load line is pre-positioned for more precise current control. Also disclosed is an adaptive filter with adjustable frequency characteristics in response to an ATR event.

US Patent:

8193796, Jun 5, 2012

Filed:

Feb 16, 2009

Appl. No.:

12/371835

Inventors:

Benjamim Tang - Rancho Palos Verdes CA, US
Robert T. Carroll - Andover MA, US
Nicholas R. Steffen - Redondo Beach CA, US
Richard C. Pierson - Newport Beach CA, US

Assignee:

Infineon Technologies Austria AG - Villach

International Classification:

G05F 1/00

US Classification:

323283, 323272

Abstract:

Disclosed is a power regulator for providing precisely regulated power to a microelectronic device such as a microprocessor. Improved power regulation is accomplished by optimizing the power efficiency of the power regulator. In particular, in a multiphase system, the number of active phases is increased or decreased to achieve optimum power efficiency. The multiphase voltage regulator adapts the operating mode to maximize efficiency as the load current demand of the load device changes by adjusting the number of active phases to maximize efficiency. The total value of current provided by the regulator and the total number of active phases is determined, the total number of active phases is compared with the number of active phases required to provide the total value of current at maximum efficiency; and the number of active phases is adjusted to provide the total value of current at maximum efficiency. A current sense circuit senses the current at each phase, a summing circuit coupled to the output of the current sense circuit provides the total current value of all the measured phases, a circuit coupled to the output of the summing circuit provides the time averaged total current value to a threshold detecting circuit that determines the number of phases at which the voltage regulator should be operating for maximum efficiency, and a circuit for comparing the number of phases that are operating to the number of phases at which the voltage regulator should be operating adjusts the number of active phases to the number of phases at which the voltage regulator should be operating for maximum efficiency.

US Patent:

8541995, Sep 24, 2013

Filed:

Feb 3, 2012

Appl. No.:

13/365908

Inventors:

Benjamin Tang - Rancho Palos Verdes CA, US
Robert T. Carroll - Andover MA, US
Scott Wilson Southwell - Seal Beach NC, US
Kenneth A. Ostrom - Palos Verdes Estates CA, US
Richard C. Pierson - Newport Beach CA, US

Assignee:

Infineon Technologies Austria AG - Villach

International Classification:

G05F 1/575

US Classification:

323272, 323283, 323284

Abstract:

A multiphase power regulator includes a multiphase pulse width modulator, an output stage and an active transient response circuit. The output stage includes a high side transistor, a low side transistor and an inductor. The output stage is configured to supply power to a load responsive to signals generated by the multiphase pulse width modulator. The active transient response circuit is coupled between the output stage and the multiphase pulse width modulator and configured to detect the voltage level at the output stage and provide a signal to the multiphase pulse width modulator that is a function of the amplitude of the deviation of the detected voltage level from a target voltage.