#coding scheme

For my electrical measurements class I studied Analog-digital-converters and their characteristics. One main property is the coding scheme, that is which digital code is assigned to which input voltage.

Part of the class was making a nice graph showing an example scheme. After wrestling Scilab for quite a bit, I finally came up with this function which I would like to share.

// ADC coding scheme // n bits // offset is horizontal offset in U_LSB steps, e.g. -0.5 function ADCScheme(n, offset) if ~exists("offset", "local") then offset = 0 end title("Coding scheme of a " + string(n) + " bit ADC", 'fontsize', 4) // Plot step curve high = 2**n plot2d2([offset:1:(high+offset)], [0:1:high], 1, "111", "", [0,-0.25,(high-0.75),(high-0.75)]) // Configure axes and ticks a=gca(); ticks = (0:1:(high-1))' tick_labels = repmat('', [high, 1]); tick_labels(1) = "Umin"; tick_labels($) = "Umax"; a.y_ticks = tlist(["ticks", "locations", "labels"], ticks, dec2bin(ticks)); a.x_ticks = tlist(["ticks", "locations", "labels"], ticks, tick_labels); a.sub_ticks = [0,0]; xset("font size", 2); xgrid(color(190,190,190)); xlabel("Voltage", 'fontsize', 3); ylabel("Code", 'fontsize', 3); // Turn legend off l=a.children(2); l.visible="off"; endfunction ADCScheme(3, -0.5)

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