Fundamental limitations of continuous-time delta-sigma modulators due to clock jitter

We examine noise due to clock jitter in single-loop low pass continuous-time delta-sigma modulators employing NRZ feedback DACs. Using the discrete-time version of the Bode sensitivity integral, we derive a lower bound on jitter noise and its relationship to the noise transfer function of the modulator. We give intuition to a recent observation (arrived through numerical optimization) that NTFs with peaking in their pass bands have lower jitter noise than maximally flat NTFs.

• Type: Conference
• Year: 2006
• Where: ISCAS
• Authors: K. Reddy, S. Pavan
• Keywords: ISCAS 2006, Jitter Noise, Lower Jitter Noise, Noise Transfer Function