High Speed High Dynamic Range A/D Converter.
Abstract
This report describes the results of a program to evaluate the feasibility of the concept of an EBS A/D converter as outlined in U.S. Patent No. 4,034,363, 'Real Time Data Quantizer and Analog-to-Digital Converter System', assigned to the U.S. Air Force. John McNamara and Paul Van Etten of the Rome Air Development Center are the co-inventors. The design consisted of circularly scanned electron beam striking coded semiconductor target wedges. The program goal was to design and fabricate a breadboard EBS A/D converter using a single target wedge operating at a 200 MHz scan frequency and evaluate its technical feasibility. Major components of the EBS A/D converter are an electron gun, orthogonal deflection structures, semiconductor target, and output interface circuitry. A substantial portion of the program effort was devoted to the design and testing of a high impedance lumped element meanderline deflection system capable of generating the large beam displacements required in the target plane. Successful operation of these meanderlines was achieved. The unique semiconductor target sectors were designed and fabricated with good yield. Complete output circuitry was designed, built and tested satisfactorily. A complete A/D converter tube was built in which the diode response under actual operating conditions was successfully demonstrated. Funding and time constraints prevented the full demonstration of A/D conversion. However, all the major components of the tube and output interface circuitry were shown to operate as required.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1978
- Accession Number
- ADA062536
Entities
People
- S. K. Brierley
Organizations
- Watkins-Johnson Company