Title :
An improved digital sensor using delta modulation loop
Author :
Lin, J. Y Gary ; Milkovic, Miran
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
A digital sensor system with an on-chip delta modulation loop is presented. The delta (Δ) modulator oversamples and modulates the analog sensor signal into a high frequency 1-bit digital pulse stream. A digital up-down counter, used as a primitive digital low pass filter, rejects the undesired high frequency quantization noise of the 1-bit digital pulse stream and improves its resolution. 10-bit resolution is achieved by using the oversampling ratio=1024. A sensor array can be constructed using this Δ modulation loop. The sensor signal from each sensor element can be fully digitized using the time division multiplexing scheme
Keywords :
analogue-digital conversion; comparators (circuits); delta modulation; digital instrumentation; electric sensing devices; signal processing; signal processing equipment; time division multiplexing; 1-bit digital pulse stream; 10-bit resolution; delta modulation loop; digital pulse stream; digital sensor; digital up-down counter; high frequency quantization noise; oversampling; primitive digital low pass filter; resolution; sensor array; time division multiplexing; transistor dynamic comparator; Counting circuits; Delta modulation; Digital modulation; Frequency; Low pass filters; Pulse modulation; Sensor arrays; Sensor systems; Signal resolution; System-on-a-chip;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1994. IMTC/94. Conference Proceedings. 10th Anniversary. Advanced Technologies in I & M., 1994 IEEE
Conference_Location :
Hamamatsu
Print_ISBN :
0-7803-1880-3
DOI :
10.1109/IMTC.1994.352013
