A novel coding scheme for the ROM of parallel ADCs, featuring reduced conversion noise in the case of single bubbles in the thermometer code

The noise arising from double row selection in the encoder ROM of a parallel ADC appreciably depends upon the chosen coding. A procedure for comparing the performance of different codes in the case of double selections is introduced and applied to the well known Gray and quasi-Gray codes. A novel flipped brick code is proposed, which performs better than both the quasi-Gray and Gray codes in terms of noise power and exhibits a simpler conversion to binary code than the Gray code