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. 20, 1986
Filed:
May. 14, 1985
BBC Brown, Boveri & Company, Ltd., Baden, CH;
Abstract
A digital integrator (1) having a 16-bit output is followed by a first 12-bit digital/analog converter (2a) which is supplied with the output bits 1-11 and 16 of the integrator (1) and which forms a first tracking loop with a first subtracter (3a), which forms a first difference signal from the output signal, proportional to the input signal of the analog/digital converter, of a first amplifier (4a) and the output signal of the first digital/analog converter (2a), and a tracking circuit (6) which generates tracking signals for the integrator (1) on the basis of the difference signal. To extend the dynamic range, a second 12-bit digital/analog converter (2b) is present which is supplied with bits 5-16 from the output of the integrator and which forms a second tracking loop with a second subtractor (3b) and a second amplifier (4b), the gain factor of which is 1/16th of the gain factor of the first amplifier (4a), to which loop a control logic (15) switches over when the range which can be covered with the first digital/analog converter (2a) is exceeded. Switching back takes place at the next zero crossing, that is to say change of the most significant bit. The digital/analog converter is particularly suitable for processing the output signal of a current or voltage converter.