This paper presents simple but accurate expressions for the noise components caused by clock jitter, in the output signal of self-oscillating sigma delta modulators (SOSDM). Contrary to conventional continuous time sigma delta modulators (CTSDM), the SOSDM's loop contains a strong oscillation, whose attribution to the system's jitter caused noise has not previously been explored. In this paper, the SOSDM system is modeled, and the effect of the self oscillation, the input signal and the quantization noise on the jitter caused noise in the output signal, is calculated. Results are confirmed by system level simulations.