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Chien-Chang Liu

from Sunnyvale, CA
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Related to:
Liu Chihling, 53Chihling Ling LiuChing C Liu, 66Ming J Liu, 62Ming Liu, 70Hsiuchi Liu
Connected to:
Abby Liu, 37Alba Liu, 48Alina Y Liu, 53Annan R Liu, 53Antong Liu, 35Anwei Liu, 62Bai Liu, 66Bao Liu, 51Baoxian Liu, 55Bella C Liu, 101

Chien-Chang Liu Phones & Addresses

  • 1018 Grape Ave, Sunnyvale, CA 94087 (408) 732-4977

Publications

Us Patents

Mechanism To Select Bandwidth In An Optical Receiver Circuit

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US Patent:
7493053, Feb 17, 2009
Filed:
Sep 30, 2004
Appl. No.:
10/954902
Inventors:
Chien-Chang Liu - Sunnyvale CA, US
Hengju Cheng - Mountain View CA, US
Assignee:
Intel Corporation - Santa Clara CA
International Classification:
H04B 10/12
US Classification:
398209, 398210
Abstract:
An optical receiver circuit is disclosed. This receiver included in receiver optical sub-assembly (ROSA) adjusts bandwidth based on a voltage level detection at a receiver signal strength indication (RSSI) pin, or rate-adaptively adjusts the bandwidth of optical receiver circuit based on operation data rate.

Bang-Bang Architecture

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US Patent:
7612625, Nov 3, 2009
Filed:
Feb 19, 2008
Appl. No.:
12/070440
Inventors:
Miaobin Gao - Saratoga CA, US
Yu-Li Hsueh - Mountain View CA, US
Chien-Chang Liu - Sunnyvale CA, US
Assignee:
Intel Corporation - Santa Clara CA
International Classification:
H03B 5/12
H03B 27/00
H03L 7/099
US Classification:
331177R, 331 34, 331 36 C, 331 45, 331 48, 331117 FE, 331 25, 331177 V, 331179, 375376
Abstract:
In one embodiment, the present invention includes an apparatus having a voltage controlled oscillator (VCO) to generate a first clock signal having a frequency controlled by a bias current coupling ratio of first and second bias currents, and a control circuit coupled to the VCO to generate a first pair of control signals to adjust the bias current coupling ratio. Other embodiments are described and claimed.

Phase/Frequency Detector And Charge Pump Architecture For Referenceless Clock And Data Recovery (Cdr) Applications

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US Patent:
7692501, Apr 6, 2010
Filed:
Sep 14, 2007
Appl. No.:
11/855857
Inventors:
Yu-Li Hsueh - Mountain View CA, US
Miaobin Gao - Saratoga CA, US
Chien-Chang Liu - Sunnyvale CA, US
International Classification:
G01R 23/06
H03D 13/00
US Classification:
331 25, 331 11, 327157, 327 9, 327 12, 327 43, 327 45, 327 49
Abstract:
A stream of data may flow over a fiber or other medium without any accompanying clock signal. The receiving device may then be required to process this data synchronously. Embodiments describe clock and data recovery (CDR) circuits which may sample a data signal at a plurality of sampling points to partition a clock cycle into four phase regions P, P, P, and P which may be represented on a phase plane being divided into four quadrants. A relative phase between a data signal transition edge and a clock phase may be represented by a phasor on the phase plane. The clock phase and frequency may be adjusted by determining the instantaneous location of the phasor and the direction of phasor rotation in the phase plane.

Redundant Channel Implementation To Extend Optical Transceiver Lifetime And Reliability

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US Patent:
7801442, Sep 21, 2010
Filed:
Dec 28, 2006
Appl. No.:
11/648491
Inventors:
Frank Wang - Sunnyvale CA, US
Darren Crews - Santa Clara CA, US
Lee Xu - Cupertino CA, US
Graham Flower - San Jose CA, US
Miaobin Gao - Saratoga CA, US
Chien-Chang Liu - Sunnyvale CA, US
Jesse Chin - Saratoga CA, US
Brian Kim - Fremont CA, US
William Wang - Pleasanton CA, US
Guobin Liu - San Luis Obispo CA, US
Xiaojie Xu - Superior CO, US
Thiri Lwin - Fremont CA, US
Yousheng Wu - San Jose CA, US
Simon Lee, II - San Jose CA, US
Assignee:
Intel Corporation - Santa Clara CA
International Classification:
G02F 1/00
US Classification:
398 5, 398 2, 398 3
Abstract:
Embodiments introduce redundant optical channels to significantly extend the lifetime of parallel optical transceivers. A plurality of transmitters, N, transmit on a plurality of optical channels, where N is an integer number of optical channels greater than 1. One or more redundant channels, M, are also provided. N+M multiple input shift registers provide multiple paths for signals from each of the transmitters to connect to N+M laser diodes. In the event up to M of the N+M laser diodes fail, the multiple input shift registers connect the N transmitters to functioning ones of the N+M laser diodes thus extending the life of the device. A corresponding scheme is also described for the receiver side.

Real Time Constant Excitation Ratio (Er) Laser Driving Circuit

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US Patent:
20060126684, Jun 15, 2006
Filed:
Dec 10, 2004
Appl. No.:
11/008905
Inventors:
Chien-Chang Liu - Sunnyvale CA, US
HengJu Cheng - Mountain View CA, US
International Classification:
H01S 3/00
US Classification:
372038070
Abstract:
Adverse effects to laser excitation ratio slope caused for example by ambient temperature maybe compensated for by adjusting drive current to the laser. The real time excitation ratio slope may be determined by dithering the code word by +/−1 least significant bit (LSB) of a digital-to-analog drive current source (DAC). A slight variation in laser output power caused by the dither may be detected and used to calculate in real time the laser excitation ratio slope. This may be used to select a drive current to compensate for ambient changes keeping the excitation ratio slope substantially constant.

Driving A Laser Using An Electrical Link Driver

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US Patent:
20070009267, Jan 11, 2007
Filed:
Jun 22, 2005
Appl. No.:
11/165298
Inventors:
Darren Crews - Santa Clara CA, US
Shenggao Li - Pleasanton CA, US
Chien-Chang Liu - Sunnyvale CA, US
Robert Johnston - Sacramento CA, US
International Classification:
H04B 10/04
US Classification:
398182000
Abstract:
An electrical link driver for a point-to-point link is coupled to a laser. The electrical link driver provides a modulation current to the laser.

Controlling Optical Power And Extincation Ratio Of A Semiconductor Laser

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US Patent:
20070116076, May 24, 2007
Filed:
Nov 21, 2005
Appl. No.:
11/284755
Inventors:
Frank Wang - Sunnyvale CA, US
Chien-Chang Liu - Sunnyvale CA, US
HengJu Cheng - Mountain View CA, US
Lee Xu - Cupertino CA, US
International Classification:
H01S 3/00
US Classification:
372038070, 372038010
Abstract:
Disclosed herein are methods, apparatus, and systems to achieve substantially constant optical power and/or extinction ratio for a semiconductor laser. In one aspect, a microcontroller of an optical transmitter may adjust an electrical current that is provided to a semiconductor laser based at least in part on a comparison of a first measured optical power of light emitted by the semiconductor laser and a predetermined target optical power. The microcontroller may then determine an electrical current that is capable of giving the semiconductor laser a substantially constant extinction ratio by evaluating an equation with the first measured optical power and a second optical power measured after the controller adjusts the electrical current.

Controlling A Bias Current For An Optical Source

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US Patent:
20080304527, Dec 11, 2008
Filed:
Jun 7, 2007
Appl. No.:
11/810746
Inventors:
Miaobin Gao - Saratoga CA, US
Darren Crews - Santa Clara CA, US
Chien-Chang Liu - Sunnyvale CA, US
International Classification:
H01S 3/00
US Classification:
372 3802
Abstract:
In one embodiment, the present invention includes an apparatus having a current mirror with a current source coupled to a first terminal and an output current to flow from an output terminal, a laser coupled to the output terminal to be biased by the output current, and a comparator to compare a voltage of the first terminal to the voltage of the output terminal and gate the current mirror based on the comparison. Other embodiments are described and claimed.
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Chien-Chang Liu from Sunnyvale, CA Get Report