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:
May. 01, 1990
Filed:
Mar. 30, 1988
Helmut Lowel, Nuremberg, DE;
Alcatel N.V., Amsterdam, NL;
Abstract
To derive a stable square-wave signal from a measurement-signal voltage obtained from a voltage divider and containing a DC component and an AC component, the low end of the voltage divider is grounded through a load resistor shunted by the series combination of a resistor and a grounded capacitor. The low end is connected through the resistor to the negative input of a comparator and through an additional resistor to the positive input of the comparator. This positive input is also connected through a feedback resistor to the output of the comparator. The low end is connected to the supply voltage (U.sub.V) via a second voltage divider whose first resistor is formed by a controllable, temperature-stabilized zener diode connected to the supply voltage (U.sub.V) through the second resistor of the second voltage divider. The measurement-signal voltage (U.sub.M) obtained from the tap of the first voltage divider is applied to the control electrode of the zener diode.