The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 1996
Filed:
Feb. 21, 1995
Glenn A DeJong, Merritt Island, FL (US);
Kantilal Bacrania, Palm Bay, FL (US);
Michael D Church, Sebastian, FL (US);
Gregory J Fisher, Indialantic, FL (US);
John T Gasner, Satellite Beach, FL (US);
Akira Ito, Palm Bay, FL (US);
Jeffrey M Johnston, Palm Bay, FL (US);
Dave Kutchmarick, Mountaintop, PA (US);
Choong-Sun Rhee, Palm Bay, FL (US);
Harris Corporation, Melbourne, FL (US);
Abstract
A two-step analog-to-digital converter and BiCMOS fabrication method. The fabrication method provides pseudosubstrate isolation of digital CMOS devices from the analog devices. The converter uses NPN current switching in a flash analog-to-digital converter and in a digital-to-analog converter for low noise operation. CMOS digital error correction and BiCMOS output drivers provide high packing density plus large output load handling. Timing control aggregates switching events and puts them into intervals when noise sensitive operations are inactive. The fabrication method uses a thin epitaxial layer with limited thermal processing to provide NPN and PNP devices with large breakdown and Early voltages. Laser trimmed resistors provide small long term drift due to dopant stabilization in underlying BPSG and low hydrogen nitride passivation.