Daniel W Draper

US Patent:

7127391, Oct 24, 2006

Filed:

Nov 20, 2003

Appl. No.:

10/720000

Inventors:

Charles E. Chang - Thousand Oaks CA, US
Daniel Scott Draper - Portland OR, US

Assignee:

Mindspeed Technologies, Inc. - Newport Beach CA

International Classification:

G10L 21/00

US Classification:

704230, 375316

Abstract:

A method and apparatus is disclosed for reducing the error rate in a received signal by determining and establishing an optimal slice point for a decision device, or optimal operational parameters. In one embodiment, a processor monitors a received signal to determine signal characteristics, such as a peak signal level or phase value. A table look-up operation may occur in a data table or other processing may occur and, based on the signal characteristics, an optimal slice point may be determined. In one embodiment the look-up operation may also reveal one or more optimal operational parameters that, if adopted, will further reduce the error rate. A receiving station may communicate these optimal operational parameters to a transmitting station to modify operation of the transmitting station. Also disclosed is a method and apparatus for self-testing a communication system and channel to determine optimal slice points and operational parameters.

US Patent:

8509629, Aug 13, 2013

Filed:

Oct 24, 2008

Appl. No.:

12/288982

Inventors:

Hehong Zou - Westlake Village CA, US
Krishna Shivaram - Torrance CA, US
Daniel Draper - Portland OR, US

Assignee:

Mindspeed Technologies, Inc. - Newport Beach CA

International Classification:

H04B 10/06
H03F 1/34
H03F 3/68

US Classification:

398208, 398202, 398210, 330293, 330277, 330 69, 330289

Abstract:

The invention relates to amplifiers and in particular, to a transimpedance amplifier for high rate applications. Disclosed is a two stage transimpedance amplifier having a first stage comprising an amplifier and a load and a second stage comprising an amplifier and a resistor. Negative feedback is provided through a feedback resistor. Only two voltage conversions occur which reduces phase distortion, as compared to three stage transimpedance amplifiers which perform 3 voltage conversions.