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. 04, 1977
Filed:
Mar. 29, 1976
Robert P Pearson, St. Paul, MN (US);
Honeywell Inc., Minneapolis, MN (US);
Abstract
The disclosure describes circuitry for obtaining a compensating voltage signal for a device which is subject to errors caused by changes in a parameter such as ambient temperature. An operational amplifier produces an output voltage at an output thereof indicative of the changes in the parameter. A first and second plurality of series connected resistors are connected between said output and a pair of constant current sources whereby unidirectional electric currents flow through the resistors, junctions being defined between said series connected resistors. Output operational amplifier means are provided, having an inverting input means, a non-inverting input means, and output means at which the compensating voltage is developed. The non-inverting input means is connected to one of the junctions through a series connected resistor and diode, and the inverting input means is connected to another of the junctions through a series connected resistor and diode. Additional resistor/diode elements may be connected between other junctions, and the inverting and/or non-inverting input means to further shape the output compensating voltage.