Andrew W Chen

US Patent:

7944251, May 17, 2011

Filed:

Mar 9, 2009

Appl. No.:

12/381227

Inventors:

Andrew Chen - Redondo Beach CA, US
Joseph Aziz - Irvine CA, US
Derek Tam - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03B 1/00

US Classification:

327108, 327109, 327512

Abstract:

According to one exemplary embodiment, a transmitter module includes a line drive including a current digital-to-analog converter, where the line driver provides an analog output waveform. The current digital-to-analog converter receives a digitally filtered input waveform including at least two voltage steps. The at least two voltage steps of the digitally filtered input waveform cause a rise time of the analog output waveform to have a reduced dependency on process, voltage, and temperature variations in the line driver, while meeting stringent rise time requirements. The digitally filtered input waveform has an initial voltage level and a final voltage level, where the final voltage level is substantially equal to a sum of the at least two voltage steps of the digitally filtered input waveform.

US Patent:

7982491, Jul 19, 2011

Filed:

Apr 8, 2009

Appl. No.:

12/384793

Inventors:

Joseph Aziz - Irvine CA, US
Andrew Chen - Redondo Beach CA, US
Derek Tam - Irvine CA, US
Agnes Neves Woo - Encino CA, US
Marcel Lugthart - Aliso Viejo CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03K 17/16
H03K 19/003

US Classification:

326 30, 326 34, 326 86

Abstract:

According to one exemplary embodiment, an active termination circuit includes at least one active termination branch, where the at least one active termination branch includes at least one transistor for providing an active termination output. The at least one active termination branch further includes an amplifier driving the at least one transistor, where the amplifier has a non-inverting input coupled to the active termination output via a feedback network. The amplifier controls a current flowing through the at least one transistor so as to provide the active termination output. The active termination output can be provided at a drain of the at least one transistor, where a source of the at least one transistor is coupled to ground through a degeneration transistor and a tail current sink.

US Patent:

8183885, May 22, 2012

Filed:

Apr 8, 2009

Appl. No.:

12/384795

Inventors:

Joseph Aziz - Irvine CA, US
Andrew Chen - Redondo Beach CA, US
Derek Tam - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03K 19/094

US Classification:

326 86, 326 83, 327109, 341145

Abstract:

In one embodiment, a circuit for providing a tail current for a line driver includes an adjustable current source. The adjustable current source includes a number of current source cells coupled together in a parallel configuration, where the current source cells are configured to provide the tail current for the line driver in response to a digital control signal. The circuit can further include a digital core coupled to the adjustable current source, where the digital core provides the digital control signal. The digital control signal provides a number of bits, where each bit controls one of the current source cells. In one embodiment, a current source cell can comprise a number of current source sub-cells. The current source cells can be configured to provide the tail current for the line driver in response to the digital control signal when the line driver is operating in a class AB mode.

US Patent:

8243510, Aug 14, 2012

Filed:

Aug 30, 2006

Appl. No.:

11/514029

Inventors:

Andrew Chen - Redondo Beach CA, US
Bibhudatta Sahoo - San Diego CA, US
Ali Anvar - Aliso Viejo CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G11C 11/34

US Classification:

36518501, 36518514, 257315

Abstract:

According to one exemplary embodiment, a memory cell in a semiconductor chip includes a non-volatile memory transistor, a control gate, and a floating gate. The control gate is capacitively coupled to the floating gate of the non-volatile memory transistor by a metal capacitor. The metal capacitor can be formed in one or more metal levels and in one embodiment is in a shape of a comb with multiple fingers. In one embodiment, the non-volatile memory transistor is an NMOS non-volatile memory transistor.

US Patent:

8289046, Oct 16, 2012

Filed:

Jun 30, 2011

Appl. No.:

13/173706

Inventors:

Joseph Aziz - Irvine CA, US
Andrew Chen - Redondo Beach CA, US
Derek Tam - Irvine CA, US
Agnes Neves Woo - Encino CA, US
Marcel Lugthart - Aliso Viejo CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03K 17/16
H03K 19/003

US Classification:

326 30, 326 34, 326 86, 326 90

Abstract:

According to one exemplary embodiment, an active termination circuit includes at least one active termination branch, where the at least one active termination branch includes at least one transistor for providing an active termination output. The at least one active termination branch further includes an amplifier driving the at least one transistor, where the amplifier has a non-inverting input coupled to the active termination output via a feedback network. The amplifier controls a current flowing through the at least one transistor so as to provide the active termination output. The active termination output can be provided at a drain of the at least one transistor, where a source of the at least one transistor is coupled to ground through a degeneration transistor and a tail current sink.

US Patent:

8598917, Dec 3, 2013

Filed:

Apr 27, 2011

Appl. No.:

13/095688

Inventors:

Andrew Chen - Redondo Beach CA, US
Joseph Aziz - Irvine CA, US
Derek Tam - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03B 1/00

US Classification:

327108, 327109

Abstract:

According to one exemplary embodiment, a transmitter module includes a line drive including a current digital-to-analog converter, where the line driver provides an analog output waveform. The current digital-to-analog converter receives a digitally filtered input waveform including at least two voltage steps. The at least two voltage steps of the digitally filtered input waveform cause a rise time of the analog output waveform to have a reduced dependency on process, voltage, and temperature variations in the line driver, while meeting stringent rise time requirements. The digitally filtered input waveform has an initial voltage level and a final voltage level, where the final voltage level is substantially equal to a sum of the at least two voltage steps of the digitally filtered input waveform.

US Patent:

50431021, Aug 27, 1991

Filed:

Nov 29, 1989

Appl. No.:

7/443633

Inventors:

Andrew Chen - Covina CA
Richard L. Frentzel - Chino Hills CA

Assignee:

Advanced Products, Inc. - Cheshire CT

International Classification:

H01B 106

US Classification:

252514

Abstract:

A conductive die attach composition containing no solvent and substantially no ionic impurities which comprises: (a) an epoxy resin system comprising (i) at least one low viscosity epoxy resin; and (ii) at least one epoxy resin hardener; (b) at least one unsaturated monomer which, when polymerized, is not capable of reacting with said epoxy resin system; (c) at least one free radical initiator for polymericing said unsaturated monomer; and (d) finely divided silver particles.

US Patent:

20220374323, Nov 24, 2022

Filed:

May 20, 2022

Appl. No.:

17/664390

Inventors:

- Kyoto-shi, JP
Andrew Chen - Huntington Beach CA, US
Xuanvu Cu - Canoga Park CA, US
Sina Sattari - Porter Ranch CA, US

International Classification:

G06F 11/27
G06F 9/451

Abstract:

A tuning system for live tuning of a motor is disclosed. The tuning system can implement a tuning process that periodically provides tuning parameters and tests to a device for tuning in response to initiation of a tuning process such that parameters can be adjusted during the tuning process. The tuning system can include tuning tool(s) and associated application(s) configured to run thereon. The associated application(s) can include a tuning application, a middleware application to gather data relating to the tuning, a networking program to stream tuning results to a computing device. The computing device can include a networking program to receive the tuning results that are streamed from the tuning system through its networking program and a user interface (UI) application to display the tuning results.