Daniel L Essig, Age 662751 Mackinnon Ranch Rd, Cardiff By The Sea, CA 92007

6411158, Jun 25, 2002

Sep 3, 1999

09/390072

Daniel L. Essig - Cardiff by the Sea CA

Conexant Systems, Inc. - Newport Beach CA

G05F 110

327539, 323313

A bandgap reference voltage circuit is provided that substantially prevents noise sensitivity. The bandgap reference voltage circuit includes an operational amplifier, transistors, and a resistive element on one input of the operational amplifier. The resistive element substantially prevents noise from creating a non-zero mean change in current across one of the transistors. Thus, the resistive element substantially precludes noise from being rectified by a transistor, so that the output reference voltage of the bandgap reference voltage circuit is substantially stable and fixed.

5500892, Mar 19, 1996

Feb 14, 1994

8/195267

Daniel L. Essig - La Jolla CA

Brooktree Corporation - San Diego CA

H04B 323

379345

Analog signals representing individual digital values (+3, +1, -1, -3) of data pass through a telephone line to a receiver. These signals may first be provided in a pseudo random sequence. A linear echo canceller and a first adder at the receiver simultaneously eliminate, to some extent, echo signals resulting from second analog signals transmitted through the telephone line by the receiver. A non-linear echo canceller and a second adder further significantly reduce the echo signals and specifically reduce non-linear components in the echo signals. Adjustable signal delays achieve optimal performance of the linear and non-linear echo cancellers. In one inventive embodiment, each echo canceller includes a memory which stores, for each terminal in such echo canceller, data representing (a) the pseudo random sequence and (b) coefficients for adjusting the signals in such sequence. Such data for each terminal in such echo canceller is recorded in the memory for introduction to the next terminal in the memory. For each terminal in such echo canceller, the signals representing the data for the coefficient and the output from the associated adder are processed to determine an adjusted value of such coefficient for storage in the memory and for use in the next cycle of processing.

6218977, Apr 17, 2001

Sep 25, 1998

9/160735

Brian W. Friend - Carlsbad CA
Daniel L. Essig - La Jolla CA
Stelian Mocanita - San Diego CA

Conexant Systems, Inc. - Newport Beach CA

H03M 134

341163

A circuit for implementing a first order noise shaping apparatus for use in data converters employing thermometer-code based elements is disclosed. Raw thermometer code is rotated by up to four columns of shifters such that the code is rotated up to 15 positions. In this manner, the elements of the data converter may equally participate in the conversion process, thereby minimizing the effects of mismatched elements in a data converter by distributing errors due to mismatched elements. Such a process may be used in digital to analog converters and analog to digital converters such that a suitable data weighted algorithm can be used.