Chinh T Phan

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.

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.

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.

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.