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:
Oct. 16, 1990
Filed:
Nov. 17, 1988
Pham N Tung, Paris, FR;
Thomson Hybrides et Microondes, Paris, FR;
Abstract
A digital/analog converter designed for very high frequencies is described. It has a first stage, which is a standard stage, in which several parallel-mounted controllable loads deliver currents in geometrical progression in a current/voltage converting transistor. Each controllable load has an input transistor, to the gate of which a bit is addressed as well as a diode and a saturable resistor. The second stage is a shifter formed by a transistor mounted as a follower source, in series with at least one diode and one pull-back transistor, the source of which is at a negative potential. The voltage at the drain of the converting transistor is applied to the gate of the shifter transistor, and the output voltage at the drain of the pull-back transistor is looped to the gate of the converting transistor.