Krishnakumar Sundaresan from San Jose, CA, age 45

Us Patents

Predictive Analog-To-Digital Converter And Methods Thereof
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US Patent:

8009072, Aug 30, 2011
Filed:

Dec 19, 2009
Appl. No.:

12/642780
Inventors:

Kenneth Wayne Rigby - Clifton Park NY, US
Robert Gideon Wodnicki - Niskayuna NY, US
Krishnakumar Sundaresan - Albany NY, US
Naresh Kesavan Rao - Clifton Park NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03M 3/00
H03M 1/12
H03M 1/10
US Classification:

341143, 341155, 341118, 341119, 341120
Abstract:

Predictive Analog-to-Digital Converter system in one embodiment includes a sampling section producing a sampled analog input signal with a first summer section combining the sampled analog input signal and an analog prediction signal to produce an analog prediction error signal. There is at least one error analog-to-digital convertor digitizing the analog prediction error signal, wherein a digital error signal output from the error analog-to-digital convertor is one of a full bitwidth error signal during an over-range condition else a lower bitwidth error signal. A second summer is coupled to the digital error signal output and a digital prediction signal, and generates a full bitwidth digital output signal. A feedback section is coupled to the digital output signal and providing the digital prediction signal and the analog prediction signal.

Transmission Circuit, Ultrasonic Probe And Ultrasonic Image Display Apparatus
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US Patent:

8451155, May 28, 2013
Filed:

Feb 25, 2011
Appl. No.:

13/035675
Inventors:

Shinichi Amemiya - Tokyo, JP
Bruno Haider - Ballston Lake NY, US
Naresh Kesavan Rao - Clifton Park NY, US
Krishnakumar Sundaresan - Clifton Park NY, US
Thomas Halvorsrod - Horten, NO
Assignee:

General Electric Company - Schenectady NY
International Classification:

H03M 1/66
US Classification:

341135, 341147, 327108, 367138
Abstract:

A transmission circuit for use with an ultrasonic probe including an ultrasonic transducer is provided. The transmission circuit includes a high voltage current DAC configured to output a drive current of an ultrasonic transducer to transmit and receive ultrasound, and a waveform generator configured to output a control signal from the high voltage current DAC to the high voltage current DAC with a predetermined timing. The control signal configured to output the drive current with a desired magnitude.

Performing Via Array Merging And Parasitic Extraction
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US Patent:

8484599, Jul 9, 2013
Filed:

Jan 31, 2012
Appl. No.:

13/362583
Inventors:

Krishnakumar Sundaresan - Pleasanton CA, US
Assignee:

Synopsys, Inc. - Mountain View CA
International Classification:

G06F 17/50
US Classification:

716115, 716 52, 716108, 716111, 716112, 716113
Abstract:

Systems and techniques for performing parasitic extraction on a via array are described. If the via array is a single row or column via array, the system identifies a first via and a last via in the via array, and merges a set of vias between the first via and the last via into a center via. If the via array is a M×N (M≧2, N≧2) via array, the system merges the vias as follows: the first row and the last row of vias in the via array into a first row via and a last row via, respectively; the first column and the last column of vias in the via array into a first column via and a last column via, respectively; and a set of vias between the first and last rows and the first and last columns into a center via.

System And Method For Soft-Field Tomography Data Acquisition
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US Patent:

8508240, Aug 13, 2013
Filed:

Mar 23, 2011
Appl. No.:

13/070294
Inventors:

Krishnakumar Sundaresan - Clifton Park NY, US
Naresh Kesavan Rao - Clifton Park NY, US
Alexander Seth Ross - Albany NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

G01R 27/04
US Classification:

324629, 324 711, 324663
Abstract:

A system and method for soft-field tomography data acquisition are provided. One system includes a plurality of transducers that correspond to a plurality of channels, and an excitation driver coupled to generate excitation signals for the plurality of transducers. The system also includes a single reference excitation source from which excitations are generated and one or more derived excitation sources. The one or more derived excitation sources derive excitations from the single reference excitation source that are applied to each of the plurality of channels. The system further includes a response detector and a reduced bit digitizer in each of the plurality of channels configured to digitize a measured response difference between the measured response at one or more of the transducers and at least one of an excitation of the single reference excitation source or an excitation derived from the single reference excitation source or a separate reference.

Ultrasonic Transducer Driving Ciruit And Ultrasonic Image Display Apparatus
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US Patent:

20130104658, May 2, 2013
Filed:

Oct 28, 2011
Appl. No.:

13/284156
Inventors:

Shinichi Amemiya - Tokyo, JP
Bruno Haider - Ballston Lake NY, US
Krishnakumar Sundaresan - Clifton Park NY, US
International Classification:

G01N 29/06
H01L 41/09
US Classification:

73606, 310317
Abstract:

An ultrasonic transducer driving circuit configured to supply an output current and/or an output voltage to an output line for driving an ultrasonic transducer is provided. The ultrasonic transducer driving circuit includes a first current discharge circuit configured to allow a current arising from electric charges accumulated in the ultrasonic transducer to flow from the output line to ground when the output line is at a positive voltage, and a second current discharge circuit configured to allow the current arising from the electric charges accumulated in the ultrasonic transducer to flow from ground to the output line when the output line is at a negative voltage. The first current discharge circuit and the second current discharge circuit are controlled based on the output current and/or the output voltage.

Ultrasound Imaging System And Method For Temperature Management
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US Patent:

20140005546, Jan 2, 2014
Filed:

Jun 29, 2012
Appl. No.:

13/537109
Inventors:

Bruno Hans Haider - Ballston Lake NY, US
Krishnakumar Sundaresan - Clifton Park NY, US
Boris Constantine Joesaar - Berlin, DE
Assignee:

GENERAL ELECTRIC COMPANY - SCHENECTADY NY
International Classification:

A61B 8/14
US Classification:

600447, 600443
Abstract:

A temperature management system and a method of monitoring temperature in an ultrasound imaging system is provided. The system includes an ultrasound probe. The ultrasound probe includes at least one ultrasound transducer and a plurality of application specific integrated circuits. Further, the system includes at least one temperature sensing device disposed on at least one of the plurality of application specific integrated circuits. The temperature sensing devices are disposed in such a way that the sensing devices are in thermal contact with at least one heat producing region of the ultrasound probe.

Low Noise Amplifier With Hybrid Termination And Variable Gain
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US Patent:

20180234059, Aug 16, 2018
Filed:

Feb 14, 2017
Appl. No.:

15/432767
Inventors:

- Schenectady NY, US
Krishnakumar Sundaresan - Niskayuna NY, US
Nanette Judith Gruber - Niskayuna NY, US
Bruno Hans Haider - Niskayuna NY, US
International Classification:

H03F 3/183
H03G 1/00
H03F 1/56
A61B 8/00
A61B 8/08
Abstract:

A system including a low noise amplifier is provided. The system further includes a coarse attenuation circuit coupled to an input of the low noise amplifier and configurable to attenuate an input signal by a coarse attenuation interval. The system also includes a fine attenuation circuit coupled in feedback with the low noise amplifier and configurable to attenuate the input signal by a fine attenuation interval, wherein the fine attenuation interval is less than the coarse attenuation interval.

Ultrasonic Transducer Driving Circuit And Ultrasonic Image Display Apparatus
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US Patent:

20150053010, Feb 26, 2015
Filed:

Oct 29, 2014
Appl. No.:

14/527248
Inventors:

- Schenectady NY, US
Bruno Haider - Ballston Lake NY, US
Krishnakumar Sundaresan - Clifton Park NY, US
Assignee:

GENERAL ELECTRIC COMPANY - Schenectady NY
International Classification:

H01L 41/09
G01N 29/44
G01N 29/06
US Classification:

73606, 310317
Abstract:

An ultrasonic transducer driving circuit configured to supply an output current and/or an output voltage to an output line for driving an ultrasonic transducer is provided. The ultrasonic transducer driving circuit includes a first current discharge circuit configured to allow a current arising from electric charges accumulated in the ultrasonic transducer to flow from the output line to ground when the output line is at a positive voltage, and a second current discharge circuit configured to allow the current arising from the electric charges accumulated in the ultrasonic transducer to flow from ground to the output line when the output line is at a negative voltage. The first current discharge circuit and the second current discharge circuit are controlled based on the output current and/or the output voltage.