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Low-cost integrable device for the acquisition of electric signals in compliance with the arnic 429 standard

  • US 5,719,577 A
  • Filed: 03/21/1996
  • Issued: 02/17/1998
  • Est. Priority Date: 03/27/1995
  • Status: Expired due to Fees
First Claim
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1. A device for converting an analog signal of digital data transmission into a digital signal, comprising an analog circuit to which is applied the analog signal, and which is connected to an input of a digital circuit for supplying said digital signal, said analog circuit comprising a capacitor which is charged by said received analog signal via a first resistor, the voltage at the terminals of the capacitor being applied to a terminal connecting said analog circuit to a digital circuit via a second resistor, said digital circuit comprising:

  • a measuring and compensating circuit including a digital threshold comparator for comparing the voltage at said capacitor terminals with a threshold voltage, and for transmitting, to a flip-flop, a logic signal whose status is a function of the result of said comparison, a means for periodically applying, via said second resistor, to said capacitor, a charge or discharge compensation voltage depending on the status of said flip-flop, during a first constant period having a predetermined value, so as to charge or discharge said capacitor and bring the voltage of said capacitor back to said threshold voltage, anda filtering and counting circuit comprising a means for counting, by way of an output signal of said flip-flop representative of the flip-flop status, among last N compensations applied to said capacitor, the number of discharge compensations from which is deducted the number of charge compensations, the number thus obtained being at all times representative of said received analog signal.

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