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:
Jun. 28, 1988
Filed:
Jan. 29, 1987
Martin Maschek, Wurenlos, CH;
Georg Mastner, Niederrohrdorf, CH;
BBC Brown, Boveri & Company Limited, Baden, CH;
Abstract
A circuit arrangement for converting an input voltage into a proportional ouput signal, including a converting resistance which is followed by operational amplifier having a feedback resistance. For the purpose of stabilizing the gain of the circuit arrangement with respect to changes in the converting resistance, the latter is formed by connecting two branch resistances in parallel with each other. These branch resistances are series-connected in a bridge circuit to which a direct voltage is supplied from a voltage source. The bridge circuit also includes an operational amplifier and high-quality film resistors and a variable balancing resistance which includes, in series, another film resistor and a field effect transistor. An integrator automatically balances the bridge circuit by controlling the field effect transistor. The balancing resistor. The feedback resistance operational of the amplifier contains, in series, a film resistor which corresponds to the film resistor in the balancing resistance and a field effect transistor which is matched to the field effect transistor (13) in the balancing resistance. The field effect transistors are controlled in parallel by the integrator. The circuit arrangement can be used for processing the output signal of a capacitive voltage transducer.