Ching Hsia Chu

US Patent:

7893714, Feb 22, 2011

Filed:

Feb 6, 2009

Appl. No.:

12/367310

Inventors:

Ching Chu - San Jose CA, US

Assignee:

Supertex, Inc. - Sunnyvale CA

International Classification:

H03K 19/094
H03K 3/00

US Classification:

326 68, 327109

Abstract:

An integrated circuit high voltage analog switch has digital logic-level control interface circuit. A level translator is coupled to the digital logic-level control interface circuit. A plurality of output multi-channel high voltage switches is coupled to the level translator.

US Patent:

7956653, Jun 7, 2011

Filed:

May 4, 2009

Appl. No.:

12/434862

Inventors:

Benedict C. K. Choy - Cupertino CA, US
Ching Chu - San Jose CA, US

Assignee:

Supertex, Inc. - Sunnyvale CA

International Classification:

H03K 3/00

US Classification:

327108, 327112, 326 83

Abstract:

A complementary high voltage switched current source circuit has a complementary current source pair, wherein a first of the current source pair is coupled to a positive voltage rail and a second of the current source pair is coupled to a negative voltage rail. A digital logic-level control interface circuit is coupled to the complementary current source pair and to the positive voltage rail and the negative voltage rail. A pair of high voltage switches is coupled to the complementary current source pair and the digital logic-level control interface circuit and controlled by the digital control interface circuit.

US Patent:

7977820, Jul 12, 2011

Filed:

Jan 15, 2009

Appl. No.:

12/354137

Inventors:

Ching Chu - San Jose CA, US
Benedict C. K. Choy - Cupertino CA, US

Assignee:

Supertex, Inc. - Sunnyvale CA

International Classification:

H03K 3/00

US Classification:

307106

Abstract:

A ultrasound transmit pulse waveform generator for driving a piezoelectric transducer in medical ultrasound imaging, nondestructive testing (NDT) ultrasound imaging applications, includes a capacitor, switching programmable current sources, and a power amplifier.

US Patent:

8013640, Sep 6, 2011

Filed:

Jun 12, 2009

Appl. No.:

12/484107

Inventors:

Ching Chu - San Jose CA, US

Assignee:

Supertex, Inc. - Sunnyvale CA

International Classification:

H03B 21/00

US Classification:

327106, 31031601

Abstract:

An electrical waveform generating circuit has a programmable current source-driver. A digital switched current source is coupled to the programmable current source-driver and controlled by waveforms stored in the programmable current source-driver. A plurality of MOSFETs is coupled to the programmable current source driver. A center-tapped RF transformer is provided and has a primary coupled to the plurality of high voltage MOSFETs. A transducer is coupled to a secondary of the RF transformer.

US Patent:

8198922, Jun 12, 2012

Filed:

May 6, 2010

Appl. No.:

12/775242

Inventors:

Ching Chu - San Jose CA, US

Assignee:

Supertex, Inc. - Sunnyvale CA

International Classification:

H03K 3/00

US Classification:

327112

Abstract:

A digital switched current source is coupled to a programmable current source-driver and controlled by waveforms stored in the programmable and floating complementary sourcing and sinking current source-driver. A plurality of complementary P- and N-MOSFET is coupled to the programmable floating current source driver. The transformer-less programmable ultrasound transmit beamformer integrated circuit is provided and directly coupled to the plurality of transducers.

US Patent:

8542037, Sep 24, 2013

Filed:

Jan 23, 2012

Appl. No.:

13/355749

Inventors:

Ben Choy - San Jose CA, US
Ching Chu - Cupertino CA, US

Assignee:

Supertex, Inc. - Sunnyvale CA

International Classification:

H03K 3/00

US Classification:

327108, 327112, 327381, 326 27, 326 82

Abstract:

A multi-level high-voltage pulse generator integrated circuit has a digital logic-level control interface circuit. A pair of complementary MOSFETs is controlled by the digital control interface circuit. A pair of supply voltage rails is provided, wherein one of the pair of supply voltage rails is connected to each of the pair of complementary MOSFETs. A pair of Zener diodes is provided, wherein one of the pair of Zener diodes is connected to each of the pair of complementary MOSFETs. A pair of resistors is provided, wherein one of the pair of resistors is connected in parallel with each of the pair of Zener diodes. A pair of complementary voltage blocking-MOSFETs having predetermined gate bias voltages is provided, wherein each of the pair complementary voltage blocking-MOSFETs is attached to a corresponding one pair of complementary MOSFETs.

US Patent:

8648627, Feb 11, 2014

Filed:

Aug 16, 2012

Appl. No.:

13/587551

Inventors:

Ching Chu - San Jose CA, US

Assignee:

Supertex, Inc. - Sunnyvale CA

International Classification:

H03B 21/00

US Classification:

327106, 327112, 327129

Abstract:

An electrical waveform generating circuit has a programmable current source-driver. A digital switched current source is coupled to the programmable current source-driver and controlled by waveforms stored in the programmable current source-driver. A plurality of MOSFETs is coupled to the programmable current source driver. A first coupled inductor is connected to the plurality of high voltage MOSFETs. A transducer is coupled to the first coupled inductor.

US Patent:

20030095755, May 22, 2003

Filed:

Nov 16, 2001

Appl. No.:

09/991226

Inventors:

Vladimir Vaganov - Los Gatos CA, US
Ching Chu - Sunnyvale CA, US
Michael Kohlstadt - San Jose CA, US

International Classification:

G02B006/42
G02B006/36

US Classification:

385/088000, 385/092000, 385/093000, 385/052000

Abstract:

An apparatus and method to align and assemble a photonic package with sub-micron placement accuracy. The apparatus, or feature, maintains mechanical contact between a first and a second photonic component while the two photonics are aligned and affixed together. The package may comprise the first photonic component having a contact surface and the second photonic component having a partially spherical surface. The contact surface is shaped and fitted to rotatably couple with the partially spherical surface while permitting the partially spherical surface to move in at least three rotational degrees of freedom. The two photonic components are then aligned as desired and affixed together. Certain variations permit motion of the partially spherical surface in three rotational degrees of freedom and one linear degree of freedom. At least one version of the invention includes aligning and assembling an optical fiber with an optical MEMS-based device. In this version, the partially spherical surface of the second component may be coupled with the optical fiber first and makes contact with a contact surface of the MEMS-based device. The optical fiber is then rotated in two degrees of freedom until a desired alignment with the MEMS-based device is achieved. The optical fiber and the MEMS-based device are then affixed by affixing the partially spherical surface and the contact surface together. In one alternate variation the partially spherical surface is shaped to make contact with a contact area of the contact surface. The partially spherical surface maintains connection with at least part of the contact area while the partially spherical surface is rotated in at least two rotational degrees of freedom.

Author:

Ching Chu

ISBN #:

0819427918