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:
Feb. 21, 1995
Filed:
Jun. 24, 1993
John A Krawczak, Minnetonka, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A signal processing circuit that is subject to signal chatter is provided with signal chatter-elimination circuitry. Prior signal processing circuitry included a peak voltage detector which received a data input signal and provided a peak voltage representation of the input signal and a threshold-comparator that provided a threshold-comparison signal of a first output voltage magnitude when the peak voltage representation was below a predefined threshold voltage and of a second output voltage magnitude when the peak voltage representation was above the predefined threshold voltage. Improved signal chatter elimination is achieved by the further incorporation of a differential operational amplifier that has (a) a first input terminal that receives a data-representative signal which is subject to signal chatter, (b) a second input terminal that is coupled to receive a threshold-comparison signal of either a first fixed voltage level that blocks the output signal, or of a second variable voltage level that allows the output signal to be provided by the amplifier, and (c) a source of second variable voltage level which is temperature compensated, and the further incorporation of a threshold-level switch coupled to the threshold-comparator to receive the threshold comparison signal and to the amplifier, wherein the threshold-level switch is constructed to supply the first fixed voltage level to the second input terminal when the input signal is below the threshold voltage and the second voltage level to the second input terminal when the input signal is above the threshold voltage.