Geoffrey C Watts

US Patent:

43852602, May 24, 1983

Filed:

Sep 9, 1975

Appl. No.:

5/611743

Inventors:

Geoffrey P. Watts - Mesa AZ

Assignee:

Beckman Instruments, Inc. - Fullerton CA

International Classification:

H01J 6106
H01J 6130

US Classification:

3151692

Abstract:

Bargraph displays wherein the illuminable bar segments are formed by winding filamentary conductors upon a mandrel.

US Patent:

42258251, Sep 30, 1980

Filed:

Sep 25, 1978

Appl. No.:

5/945159

Inventors:

Geoffrey P. Watts - Mesa AZ

Assignee:

Beckman Instruments, Inc. - Fullerton CA

International Classification:

H03K 500
H03K 410

US Classification:

328185

Abstract:

An improved ramp generating circuit which is self-compensating for changes in component performance is disclosed. The circuit is designed to attain a reference voltage in a fixed number of counts as provided by a precision clock source. A single direction compensation feedback network is employed to increase the slope in increments until the desired peak level and clock count are attained simultaneously. Embodiments are shown wherein the circuit is employed in a gas discharge bar graph display driving circuit and as an analog-to-digital converter.