Development of the integrating analog-to-digital converter for distributive data acquisition systems with improved noise immunity

Common mode noise rejection in measuring channels

“…Galvanic insulation is the most often method [2][3][4][5][6]: analog (measuring) part of the measuring channel is not grounded (safety is achieved using special design, which does not allow the user to be struck by high volt age) and digital part (data processing and transfer) is grounded. Information transfer between analog and digital parts is provided by pulse transformers [6], but the most often method is to use optocouples (usually light emitting diode-photodiode or light emitting diode photo-transistor [2][3][4][5]).…”

“…Information transfer between analog and digital parts is provided by pulse transformers [6], but the most often method is to use optocouples (usually light emitting diode-photodiode or light emitting diode photo-transistor [2][3][4][5]). …”

“…There are two kinds of noise that appear at measur ing of temperature using thermocouples [1][2][3]:…”

17 Interface Circuitry and Microsystems

“…Subranging, halfflash, and pipeline A/D converters need between two and N clock periods per conversion, with decreasing hardware complexity. At the beginning of each conversion cycle, switch S 1 is closed and the whole capacitive array is charged at the input voltage V in (precharge and [78][79][80][81] 6 bit 1 ⁄ f ck -Subranging and Pipeline A/D Converters [82][83][84][85][86] 12 bit < N ⁄ f ck = Folding A/D Converters [87][88] 10 bit < N ⁄ f ck -Successive Approximation A/D Converters [89][90][91][92] 12 bit N ⁄ f ck = Algorithmic A/D Converters [93][94][95] 12 bit…”

Designing an accurate system for temperature measurements

“…The expansion of the sphere of temperature measurements [3,4,[18][19][20], the increase in the requirements for their quality [17,21] and the need for non-stationary measurements [15,18,19] imposes additional requirements on sensors [1,4,22], equipment [23,24] and methods of signal processing [20,21].…”