Bill Tieu Tang

7317674, Jan 8, 2008

Mar 10, 2004

10/797261

Theodore D. Rees - Mountain View CA, US
Alexander Fairgrieve - Menlo Park CA, US
Bill R. Tang - San Jose CA, US
Barry Harvey - Los Altos CA, US
Yang Zhao - Fremont CA, US

Intersil Americas Inc. - Milpitas CA

G11B 7/12

369 5327, 369121, 369 475, 369116, 369 4752, 369 4755, 369 4753, 369 5912, 369 5911

Optical pick-up units and laser drivers are disclosed, which can be used in various types of information recording/reproducing apparatuses, such as, but not limited to, DVD and CD drives, DVD camcorders, and DVD video recorders. A laser driver integrated circuit (LDIC) includes an automatic power controller, a running optical power controller, and a write strategy generator. The LDIC can be part of a chip-set, to be located on an optical pick-up unit (OPU). The chip-set can also include a power monitor integrated circuit (PMIC) to monitor the laser diode, and a photo-detector integrated circuit (PDIC) to detect light produced by the laser diode. The PMIC and the PDIC each include their own offset, gain and sample-and-hold circuitry.

7382807, Jun 3, 2008

Apr 7, 2006

11/399976

Alexander Fairgrieve - Menlo Park CA, US
D. Stuart Smith - San Jose CA, US
Theodore D. Rees - Mountain View CA, US
Bill R. Tang - San Jose CA, US

Elantec Semiconductor, Inc. - Milpitas CA

H01S 3/30
H01S 3/13
H01S 3/00

372 8, 372 2901, 372 3802

Methods and system are provided for automatic power control of a laser diode, e. g. , in a laser driver. In accordance with an embodiment of the present invention, a power controller includes a detector circuit adapted to detect the output of the laser diode and to produce a measured output therefrom. A comparator compares a desired output to the measured output, and produces an error signal therefrom. The error signal is provided to an integrator circuit that produces an integrated error signal. At least one digital-to-analog converter (DAC) uses the integrated error signal to produce a current drive signal that drives the laser diode.

8027377, Sep 27, 2011

Aug 13, 2007

11/838069

Bill R-S Tang - San Jose CA, US
Paul D. Ta - Fremont CA, US

Intersil Americas Inc. - Milpitas CA

H04B 1/38

375220

In a transceiver, a transmitter circuit is provided substantially the same common-mode voltage regardless of whether the transceiver is in a transmitting or receiving mode. In one embodiment, the transmitter circuit includes a driver circuit which, in the transmission mode of the transceiver, drives an output differential signal, and which, in the receiving mode of the transceiver, provides a termination circuit for an input differential signal. A variable resistor is provided to connect between a supply voltage and the driver circuit, the resistance of the variable resistor is selected such that the common-mode voltage of the output differential signal of the transmission mode substantially equals the common-mode voltage in the input differential signal of the receiving mode.

8332518, Dec 11, 2012

Aug 13, 2007

11/838064

Peter D. Bradshaw - Sunnyvale CA, US
Wei Wang - San Jose CA, US
Paul D. Ta - Fremont CA, US
Bill R-S Tang - San Jose CA, US
Alvin Wang - Saratoga CA, US

Intersil Americas Inc. - Milpitas CA

G06F 15/16

709227, 348536, 348537, 348538, 348539, 348540, 370477, 370478, 370479, 370480, 725121

A method provides a bidirectional communication protocol for data communication between a first device and a second device. The method includes: during a first time interval, transmitting data from the first device to the second device; and during a second time interval, (a) after the occurrence of a first event, (i) suspending data transmission from the first device to the second device; and (ii) transmitting control data from the second device to the first device; and (b) after the occurrence of a second event, transmitting control data from the first device to the second device.

8363705, Jan 29, 2013

Aug 17, 2011

13/211915

Bill R-S Tang - San Jose CA, US
Paul Ta - Fremont CA, US

Intersil Americas Inc. - Milpitas CA

H04B 1/38

375220

In a transceiver, a transmitter circuit is provided substantially the same common-mode voltage regardless of whether the transceiver is in a transmitting or receiving mode. In one embodiment, the transmitter circuit includes a driver circuit which, in the transmission mode of the transceiver, drives an output differential signal, and which, in the receiving mode of the transceiver, provides a termination circuit for an input differential signal. A variable resistor is provided to connect between a supply voltage and the driver circuit, the resistance of the variable resistor is selected such that the common-mode voltage of the output differential signal of the transmission mode substantially equals the common-mode voltage in the input differential signal of the receiving mode.

20040120369, Jun 24, 2004

Jul 2, 2003

10/612579

Alexander Fairgrieve - Menlo Park CA, US
D. Smith - San Jose CA, US
Theodore Rees - Mountain View CA, US
Bill Tang - San Jose CA, US

Elantec Semiconductor, Inc. - Milpitas CA

H01S003/13
G11B005/55
G11B007/00
G11B007/125

372/029021, 369/053260, 369/059110

Methods and system are provided for automatic power control of a laser diode, e.g., in a laser driver. In accordance with an embodiment of the present invention, a power controller includes a detector circuit adapted to detect the output of the laser diode and to produce a measured output therefrom. A comparator compares a desired output to the measured output, and produces an error signal therefrom. The error signal is provided to an integrator circuit that produces an integrated error signal. At least one digital-to-analog converter (DAC) uses the integrated error signal to produce a current drive signal that drives the laser diode.