Circuit Noise Effect on Sampling Clock in Software Radio IF Digitization

IF digitization generally requires high resolution of analog-to-digital conversion. The timing jitter is a key concern and it´s widely investigated in the published literatures. However, most of the issues mainly focused on the clock jitter with white Gaussian noise only. This paper present a more realistic analog-to-digital conversion analysis model based on the actual circuit noise conditions, particularly investigating on the clock jitter error with the combination of Gauss distribution noise and circuit noise (interference). An analytical expression for the A/D conversion with the combined clock jitter error is developed. The computer simulations are presented, which showed excellent agreement with the developed expression. Also, a real experiment brings forth a comprehensive evaluation in IF digitization.