ELEC2133 Lecture Notes - Lecture 8: Propagation Delay, 5, Dynamic Range
21 Aug 2018
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1na most significant bit (msb) weighted by oa least significant bit (lsb) weighted by e. g. , for a 3 bit word. Disadvantages of this dac: very difficult to fabricate such resistor ratios over a wide range, e. g. 12 bit, and maintain the stability, if r = 1 k then 212 1r = 2. 048 m . Data from the physical system ( real world") always appear in analogue form continuous voltage or current, e. g. thermocouple voltage, strain gauge bridge output. Analogue to digital converters (adcs) provide a means of converting such analogue signals into digital form for display purposes, storage in memory or additional digital processing. Integrator ramps downwards until vo makes a zero crossing. Noise components whose periods are integral multiples of the sampling time t1 are totally rejected. If vi is greater than the threshold voltage, the comparator output will be high. i
