Continuous time sigma-delta modulators with transmission line resonators and improved jitter and excess loop delay performance

This paper addresses the design of continuous time sigma delta modulators based on delay elements. The proposed modulators use resonators implemented with transmission lines instead of capacitive integrators. The advantage of such modulators is the desensitization of the modulator behavior against time varying effects in the feedback path such as clock jitter and DAC pulse distortion. Another advantage is the possibility of including excess loop delay as a component of the NTF of the modulator.