I made this analogue to binary converter from scratch, would appreciate some advice.

I was messing with comparators, and decided to make a signal strength to 4bit binary converter. I tried to get it as compact as I can but it can probably be smaller.

I don't know how already existing ones work, but this one checks if the value at each bit is smaller than the value of the input, and if it is subtracts that value and outputs it to the next bit.