James Paul Yoder

US Patent:

6542008, Apr 1, 2003

Filed:

Nov 28, 2000

Appl. No.:

09/723504

Inventors:

Dwight D. Daugherty - Ephrata PA
Johannes G. Ransijn - Wyomissing Hills PA
Gregory C. Salvador - Wernersville PA
James D. Yoder - Leola PA
Kenneth D. Gaynor - Reading PA

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

H03K 1716

US Classification:

327 30, 326 26

Abstract:

A system and method are provided for providing an impedance match of an output buffer to a transmission line without significantly increasing the power consumption of the output buffer. A system and method are also provided for providing an impedance match of an output buffer to a transmission line, while still allowing for an adjustable output swing as is required for loads such as laser transmitters and optical modulators.

US Patent:

6552838, Apr 22, 2003

Filed:

Jul 18, 2001

Appl. No.:

09/907420

Inventors:

Johannes G. Ransijn - Wyomissing Hills PA
James D. Yoder - Leola PA

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

G02F 103

US Classification:

359245, 359248, 359251, 359255, 359237, 359279, 359181, 385 3, 385 4, 385 14, 385 45, 385129, 385132

Abstract:

An electro-optic modulator and associated method are provided. The electro-optic modulator includes an optical waveguide comprised of two pairs of coplanar modulation strips, the strips being driven by a controller circuit which applies voltages of equal amplitude and opposite polarity to the strips of each pair. The voltage applied to the first pair of strips may differ from the voltage applied to the second pair of strips, so that a chirp factor may be adjusted if desired. The modulator and associated method exhibit reduced drive voltage requirements.

US Patent:

8213489, Jul 3, 2012

Filed:

Aug 17, 2005

Appl. No.:

11/206314

Inventors:

Johannes G. Ransijn - Wyomissing Hills PA, US
Harold Thomas Simmonds - Stewartsville NJ, US
James D Yoder - Leola PA, US

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

H04B 1/38

US Classification:

375220

Abstract:

The invention provides a communication protocol and serial interface having an approximately fixed interface clock and capable of accommodating a variety of communication rates. The interface employs a variable-length frame that may be expanded or reduced to obtain a desired communication rate, even though the interface clock rate is held approximately constant. The invention further provides a method for designing an agile barrier interface. In particular, the barrier clock rate is preferably selected to be an approximate common multiple of the various communication rates that the barrier interface must handle. The frame length corresponding to each communication rate may then be obtained by dividing the barrier clock rate by the ΣΔ rate. Finally, the invention provides an agile barrier capable of communicating data across a serial interface at a variety of data rates and at an approximately fixed interface clock rate.

US Patent:

20120195354, Aug 2, 2012

Filed:

Apr 12, 2012

Appl. No.:

13/444928

Inventors:

Johannes G. Ransijn - Wyomissing Hills PA, US
Harold T. Simmonds - Stewartsville NJ, US
James D. Yoder - Leola PA, US

Assignee:

Agere Systems Inc. - Allentown PA

International Classification:

H04B 1/38

US Classification:

375220

Abstract:

The invention provides a communication protocol and serial interface having an approximately fixed interface clock and capable of accommodating a variety of communication rates. The interface employs a variable-length frame that may be expanded or reduced to obtain a desired communication rate, even though the interface clock rate is held approximately constant. The invention further provides a method for designing an agile barrier interface. In particular, the barrier clock rate is preferably selected to be an approximate common multiple of the various communication rates that the barrier interface must handle. The frame length corresponding to each communication rate may then be obtained by dividing the barrier clock rate by the EA rate. Finally, the invention provides an agile barrier capable of communicating data across a serial interface at a variety of data rates and at an approximately fixed interface clock rate.