Inter-pulse interval based mixed signal representations

This research presents the development and analysis of inter‑pulse‑interval (IPI) techniques for converting analog voltages to pulse streams and back to analog form. An asynchronous, clock‑free IPI architecture was implemented on a fabricated MOSIS 0.35 μm CMOS chip, and design details and test results are reported. Low‑power variants of the IPI circuits were examined and shown to consume significantly less power than conventional methods such as pulse‑width modulation and sigma‑delta conversion, without reducing sampling rate. Distortion inherent to IPI conversion is analyzed and shown to be mitigated by increasing sampling rate. The IPI approach demonstrates robustness to high‑frequency attenuation and suitability for ultra‑wideband transmission, enabling applications in ultra‑low‑power wireless and biomedical sensors.