Arrangement for the conversion of an electrical in

专利名称：Arrangement for the conversion of an

electrical input quantity into a DC signalproportional thereto

发明人：Andre Elle,Gunter Lange申请号：US07/591696申请日：19901002公开号：US05103462A公开日：19920407

摘要：The arrangement for the conversion of an electrical input quantity into anelectrical DC signal proportional thereto comprises two digital pulse duration

modulators of limited resolution. The first digital pulse duration modulator supplies afirst periodic pulse sequence which is pulse duration modulated with a quantization value,corresponding to the limited resolution, of the input quantity neglecting the quantizationremainder. The second digital pulse duration modulator supplies a second periodic pulsesequence which is pulse duration modulated with the sum of the quantization value andof the quantization remainder multiplied by a predetermined factor. A system is providedfor selectively transmitting pulses of the first and second pulse sequences to anaveraging circuit in such a manner that the raito of the number of transmitted pulses ofthe second pulse sequence to the total number of transmitted pulses is equal to thereciprocal of the predetermined factor. The averaging circuit forms the DC signal meansvalue of the combined sequence of transmitted pulses, whereby the resolution is

enhanced with respect to the limited resolution of the digital pulse duration modulators.

申请人：ENDRESS U. HAUSER GMBH U. CO.

代理机构：Barnes & Thornburg

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