Jianjun J Guo from 50 Everson Way, Ballston Spa, NY 12020, age 53, Phone: 518 885-0186

Resumes

Jianjun Guo

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Jianjun Guo

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Us Patents

Circuit And Method For Reducing Bias Noise In Amplifier Circuits
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US Patent:

7489191, Feb 10, 2009
Filed:

Jun 8, 2007
Appl. No.:

11/759972
Inventors:

Naresh Kesavan Rao - Clifton Park NY, US
Jianjun Guo - Ballston Spa NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03F 1/14
US Classification:

330 51, 330149, 330296
Abstract:

An amplifier circuit and method for reducing bias noise is disclosed. The amplifier circuit includes a passive biasing source for supplying a desired bias signal to the amplifier and an active biasing source for energizing the passive biasing source to supply the desired bias signal. The amplifier circuit also includes a decoupler for selectively decoupling the active biasing source from the passive biasing source when the amplifier is configured for amplifying an input signal so that the amplifier remains isolated from electronic noise produced by the active biasing source while still being supplied the desired bias signal by the passive source.

Data Acquisition System For Medical Imaging
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US Patent:

7570185, Aug 4, 2009
Filed:

Dec 28, 2004
Appl. No.:

11/023669
Inventors:

Naresh Kesavan Rao - Clifton Park NY, US
Jianjun Guo - Schenectady NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03M 1/00
US Classification:

341138, 341120, 341118
Abstract:

A system and a method for converting an analog signal to a digital signal are provided. The technique involves receiving a sampled analog signal, and selecting one of a plurality of segments of a segmented relation between DAC output values and desired ADC input values. Desired gain and offset values are applied to the DAC output values or to the sampled analog signal based upon the selected segment. The sampled analog signal is converted to a digital signal based upon the desired gain and offset values.

Data Acquisition System For Photon Counting And Energy Discriminating Detectors
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US Patent:

7760123, Jul 20, 2010
Filed:

Aug 27, 2008
Appl. No.:

12/198989
Inventors:

Naresh Kesavan Rao - Clifton Park NY, US
Brian David Yanoff - Niskayuna NY, US
Yanfeng Du - Rexford NY, US
Jianjun Guo - Ballston Spa NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03M 1/12
US Classification:

341155, 712 36, 378 4
Abstract:

A data acquisition system including a readout Application Specific Integrated Circuit (ASIC) having a plurality of channels, each channel having a time discriminating circuit and an energy discriminating circuit, wherein the ASIC is configured to receive a plurality of signals from a semiconductor radiation detector. The data acquisition system also includes a digital-to-analog converter (DAC) electrically coupled to the ASIC and configured to provide a reference signal to the ASIC used in the generation of digital outputs from the ASIC, and a controller electrically coupled to the ASIC and to the DAC, the controller configured to instruct the DAC to provide the reference signal to the ASIC.

System And Method For Reducing Flicker Noise From Cmos Amplifiers
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US Patent:

7969244, Jun 28, 2011
Filed:

Jul 15, 2008
Appl. No.:

12/173345
Inventors:

Naresh Kesavan Rao - Clifton Park NY, US
Richard Gordon Cronce - New Berlin WI, US
Jianjun Guo - Ballston Spa NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03F 3/04
US Classification:

330296, 330124 R
Abstract:

A technique is provided for acquiring data with reduced correlated low frequency noise interference via a data acquisition circuit. The data acquisition circuit includes a plurality of data channels comprising a plurality of amplifiers and a biasing circuit for providing bias voltages to the plurality of amplifiers. The biasing circuit is configured to generate the bias voltages and establish a relationship between the bias voltages so as to reduce correlated low frequency noise in the plurality of amplifiers.

Low-Noise Data Acquisition System For Medical Imaging
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US Patent:

8040270, Oct 18, 2011
Filed:

Feb 26, 2009
Appl. No.:

12/393762
Inventors:

Naresh Kesavan Rao - Clifton Park NY, US
Richard Gordon Cronce - New Berlin WI, US
Jianjun Guo - Ballston Spa NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03M 1/12
US Classification:

341172, 341155, 341156
Abstract:

According to embodiments of the present technique, a system and a method for obtaining low-noise measurements for a wide range of analog signal strengths is provided. According to aspects of the present technique, a low-gain measurement of an input pixel charge is performed, wherein the input pixel charge is distributed to two feedback capacitors, which together provide a relatively low integrator gain. After the low-gain measurement, a high-gain measurement is performed, wherein one of the capacitors is remove from the feedback loop and the charge is redistributed to the remaining capacitor.

System And Method For Time-To-Voltage Conversion With Lock-Out Logic
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US Patent:

8159286, Apr 17, 2012
Filed:

Aug 27, 2008
Appl. No.:

12/199020
Inventors:

Naresh Kesavan Rao - Clifton Park NY, US
Brian David Yanoff - Niskayuna NY, US
Yanfeng Du - Rexford NY, US
Jianjun Guo - Ballston Spa NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03K 5/00
US Classification:

327554, 327558, 327337
Abstract:

An event time stamping system comprising a current source, an integrator comprising an input and an output, and configured to output a voltage proportional to the length of time the current source is coupled to the input, and one or more switches configured to couple the current source to the input of the integrator upon receipt of an event signal and configured to de-couple the current source from the input of the integrator upon receipt of a control trigger. The system further comprises a lock-out signal generator configured to generate a lock-out signal, and a controller coupled to the one or more switches, wherein the controller is configured to generate the control trigger based on the lock-out signal to ensure a minimum integration time.

Readout Electronics For Photon Counting And Energy Discriminating Detectors
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US Patent:

8384038, Feb 26, 2013
Filed:

Jun 24, 2009
Appl. No.:

12/490903
Inventors:

Jianjun Guo - Ballston Spa NY, US
Naresh Kesavan Rao - Clifton Park NY, US
John Eric Tkaczyk - Delanson NY, US
Yanfeng Du - Rexford NY, US
Naveen Chandra - Kenosha WI, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

G01T 1/24
US Classification:

25037009
Abstract:

A data acquisition system includes a charge-sensitive amplifier (CSA) configured to receive a charge from an x-ray detector, the CSA includes a high-gain electronic voltage amplifier, an electrical energy storage device coupled with the amplifier, and an electrical resistor coupled with the amplifier. The data acquisition system includes a baseline sampling circuit configured to receive an output from the CSA and to sample a baseline signal from the CSA, at least one discriminator coupled to an output of the CSA and to an output of the baseline sampling circuit, the at least one discriminator configured to output a voltage if the output of the CSA exceeds a threshold, and a counter coupled to an output of the discriminator and configured to output a digital signal indicative of a photon count received at the x-ray detector and based on the output from the CSA and on the signal from the CSA.

Apparatus And Method For Channel-Specific Configuration In A Readout Asic
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US Patent:

8044681, Oct 25, 2011
Filed:

Aug 27, 2008
Appl. No.:

12/199039
Inventors:

Naresh Kesavan Rao - Clifton Park NY, US
Brian David Yanoff - Niskayuna NY, US
Yanfeng Du - Rexford NY, US
Jianjun Guo - Ballston Spa NY, US
Assignee:

General Electric Company - Niskayuna NY
International Classification:

H03K 19/173
US Classification:

326 38, 326 41, 378 19, 378 988, 2502081, 712 36
Abstract:

An application-specific integrated circuit (ASIC) comprising a plurality of channels, each channel having circuitry for time and energy discrimination, a plurality of programmable registers, each programmable register configured to output at least one configuration parameter for the circuitry, and a channel-select register configured to identify a channel of the plurality of channels to be configured. The ASIC further includes a configuration-select register configured to identify the programmable register to be used for channel configuration, and a communications interface configured to transmit instructions received from a controller to one of the channel-select register, the configuration-select register, and the plurality of programmable registers.