Chinh Van Phan from San Leandro, CA, age 58

Us Patents

Filter Arrangement For Shaping A Pulse Propagated Over Pots Wiring, And A Method Of Manufacturing The Same
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US Patent:

6771774, Aug 3, 2004
Filed:

Dec 2, 1999
Appl. No.:

09/454251
Inventors:

Chinh Phan - Fremont CA
Gihad Ghaibeh - Redwood City CA
Assignee:

Tut Systems, Inc. - Lake Oswego OR
International Classification:

H04M 100
US Classification:

37941302, 37939901
Abstract:

A filter arrangement, for shaping a signal transmitted over POTS wiring, includes an input to receive a signal. The filter arrangement includes a signal path from the input to an output that is coupled to POTS wiring. The transmit path includes a high-pass filter, a low-pass filter, and a trap filter coupled between the high and the low-pass filter. The trap filter operationally introduces a filter zero at a resonant frequency of the high-pass filter.

Printed Circuit Boards For High-Speed Communication
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US Patent:

7601919, Oct 13, 2009
Filed:

Oct 21, 2005
Appl. No.:

11/255724
Inventors:

Chinh Q. Phan - Fremont CA, US
Robert P. Lombaerde - Belmont CA, US
Jignesh H. Shah - Sunnyvale CA, US
Assignee:

NeoPhotonics Corporation - San Jose CA
International Classification:

H05K 1/00
US Classification:

174254, 174261, 174363, 361792, 361789
Abstract:

Apparatus and method for communicating high-speed signals between a primary printed circuit board and one or more secondary printed circuit boards. The high-speed signals are communicated between the primary printed circuit boards and the secondary printed circuit boards through multi-layer flexible conductors.

Method Of Performance Measurement For A Scalable Network
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US Patent:

7808902, Oct 5, 2010
Filed:

Aug 3, 2001
Appl. No.:

09/922520
Inventors:

Donald Pham - San Jose CA, US
Duc Pham - San Jose CA, US
Chinh Phan - San Jose CA, US
Assignee:

Cisco Technology, Inc. - San Jose CA
International Classification:

H04L 12/26
US Classification:

370231, 370235, 709231, 709232
Abstract:

Systems and methods for measuring the performance of a scalable network are disclosed. In one embodiment, a system configured in accordance with this disclosure may comprise a packet generator for providing test packets to a network under test; and a packet count unit for counting test packet received from the network under test. The system may be configured to test networks of various bandwidths such as OC-3 and OC-12 level networks.

Spectrally Efficient Broadband Transmission System
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US Patent:

52727009, Dec 21, 1993
Filed:

Oct 17, 1991
Appl. No.:

7/778031
Inventors:

David E. Hansen - Sunnyvale CA
Robert P. McNamara - San Jose CA
James C. Long - Sunnyvale CA
Michael J. Serrone - Sunnyvale CA
Chinh Q. Phan - Fremont CA
Long K. Tran - Milpitas CA
Assignee:

First Pacific Networks, Inc. - Sunnyvale CA
International Classification:

H04J 302
US Classification:

370 853
Abstract:

A baseband signal is spectrally efficiently transmitted on a broadband transmission medium by inserting gaps in packets of digital data transmitted in a modulated first radio frequency carrier. The transmitted packets of data are received by demodulating the modulated first radio frequency carrier, and the gap is monitored for the presence of digital data thus indicating a collision of simultaneously transmitted packets of digital data. A seed of arbitrary digital bits are used in scrambling each packet of digital data and is transmitted with the packet of data for use in descrambling the data. In retransmitting the packet of data the seed is included. The originally transmitting node receives the retransmitted packet and compares the retransmitted seed with the originally transmitted seed for detecting an error in retransmission.

Apparatus For Combining Broadband And Baseband Signal Transmissions
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US Patent:

52552675, Oct 19, 1993
Filed:

Mar 9, 1992
Appl. No.:

7/848570
Inventors:

David E. Hansen - Sunnyvale CA
Robert P. McNamara - San Jose CA
Chinh Q. Phan - Fremont CA
Michael J. Serrone - Sunnyvale CA
Assignee:

First Pacific Networks, Inc. - Sunnyvale CA
International Classification:

H04J 108
H04J 110
US Classification:

370 851
Abstract:

Apparatus for combining broadband RF signals and baseband signals in a baseband distribution cable includes a bridge for coupling the distribution cable to an RF broadband trunk and to a baseband repeater. The trunk is connected through bidirectional amplifier, an impedance transformer, and a signal splitter for applying the amplified and impedance transformed broadband signal to a plurality of baseband segments. The RF signal from the splitter is passed through a 35 MHz high pass filter to the baseband segment. Baseband signals from a repeater are passed through a 25 MHz low pass filter to the baseband segment. The two filters prevent interference between the baseband and broadband signals. A tap in the distribution cable for accessing the broadband and baseband signals includes first and second low pass filters and a directional coupler serially connected between two cable terminals with a high pass filter connected in parallel with a first and second low pass filters whereby broadband signals can pass around the low pass filters. A third low pass filter connects an MAU port to the first and second low pass filters whereby baseband signals can be transmitted in either direction on the distribution cable without injecting noise in the broadband signal.