Ching Chuan Chu, 64San Jose, CA

7893714, Feb 22, 2011

Feb 6, 2009

12/367310

Ching Chu - San Jose CA, US

Supertex, Inc. - Sunnyvale CA

H03K 19/094
H03K 3/00

326 68, 327109

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.

7956653, Jun 7, 2011

May 4, 2009

12/434862

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

Supertex, Inc. - Sunnyvale CA

H03K 3/00

327108, 327112, 326 83

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.

7977820, Jul 12, 2011

Jan 15, 2009

12/354137

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

Supertex, Inc. - Sunnyvale CA

H03K 3/00

307106

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.

8013640, Sep 6, 2011

Jun 12, 2009

12/484107

Ching Chu - San Jose CA, US

Supertex, Inc. - Sunnyvale CA

H03B 21/00

327106, 31031601

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.

8198922, Jun 12, 2012

May 6, 2010

12/775242

Ching Chu - San Jose CA, US

Supertex, Inc. - Sunnyvale CA

H03K 3/00

327112

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.

8542037, Sep 24, 2013

Jan 23, 2012

13/355749

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

Supertex, Inc. - Sunnyvale CA

H03K 3/00

327108, 327112, 327381, 326 27, 326 82

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.

8648627, Feb 11, 2014

Aug 16, 2012

13/587551

Ching Chu - San Jose CA, US

Supertex, Inc. - Sunnyvale CA

H03B 21/00

327106, 327112, 327129

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.

2003009, May 22, 2003

Nov 16, 2001

09/991226

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

G02B006/42
G02B006/36

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

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.