TY - JOUR
AU - Klimovich, S.
AB - L. A. Borisyuk and S. U. Klimovich UDC 531.261.15.087.92 Relative logarithmic units - nepers and decibels - are generally used to measure signal levels in communications engineering. The zero level is usually a l-mW signal which across a resistance of, for example, 600 ~ produces a voltag e drop equal to 775 mV. The problem of taking the logarithm of the measured relative level is most simply solved with the aid of analog measuring instruments. This is accomplished by calibrating the dial of a pointer-type instrument connected at the voltage rectifier output. To express the results of measurement in digital form, the measured signal levels are rectified, smoothed, and compared with a "reference" voltage which varies exponentially. The latter can be the discharge voltage of a capacitor previously charged to a suitable vol- tage from a stable dc source. The time interval from the start of discharge to the instant of comparison, proportional to logarithm of the unknown voltage, is filled with pulses of a known frequency. These pulses are counted by an up-down counter previously set to a count corresponding to the zero level so that the logarithm of the ratio of two levels is obtained in digital 
TI - Logarithmic analog-to-digital converter
JF - Measurement Techniques
DO - 10.1007/BF00866209
DA - 2004-12-06
UR - https://www.deepdyve.com/lp/springer-journals/logarithmic-analog-to-digital-converter-0Y8AbGSFCF
SP - 398
EP - 401
VL - 32
IS - 5
DP - DeepDyve
ER -