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Low-noise sensor signals are important for digital control loops of precision switched-mode power amplifiers required to provide power output signals with an SNR of >.100 dB. In power electronics converters. isolated ADCs are often employed to acquire current voltage signals at a different potential. Digital signal isolators are commonly used to facilitate the transfer of the digital ADC output control signals across the isolation barrier. The jitter of the ADC conversion control signal. which is introduced by such isolators. has to be carefully considered in order to prevent the addition of wideband noise to the acquired signal. Consequently. this work first presents RMS jitter measurements of a wide range of commonly used digital signal isolators with isolation ratings up to 5 kVRMS. Their jitter varies greatly from values as low as 13 ps up to 250 ps. which renders their selection more tedious. as these values can vary considerably. even between isolators using the same isolation technology.
