Digital to analog converter based on pulse-width adding

Viegas, Vitor; Pereira, J. M. Dias

http://hdl.handle.net/10400.26/60384

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Authors

Viegas, Vitor

Pereira, J. M. Dias

Abstract(s)

This paper presents a digital-to-analog converter(DAC) based on the pulse width created naturally by the binary counting sequence. Theconcept involves combining the counting impulses of the bits to forma pulse-width modulated signal,where the mean voltage is proportional to the input digital code. We propose a circuit capable of achieving this using general purpose components. Although our design targets 8bits, it is scalable for any number of nibbles. The paper details simulations conducted to verify the proper functioning of the circuit and to evaluate its performance.Tests were performed to determine the static characteristics of the converter, measure its differentia nonlinearity(DNL),and observe its step response. Instaticterms,theconverterexhibitednegligiblegainandoffseterrors,withaDNLbelow1LSB(least significant bit).The converter operated correctly without any missing codes. In dynamic terms,the converter demonstrated a band width of 10kHzand behaved like a second-orderlow-pass filter with critical damping.