In this paper, we introduce the first integrated circuit (IC) implementation of spatiotemporally modulated angular-momentum (STM-AM) biased magnetless circulators. The design is based on a modified current-mode topology which is less sensitive to parasitics and relies on switched capacitors rather than varactors to achieve the desired modulation, thus reducing the circuit complexity and easing its chip-scale realization. We analyze the presented circuit and study its performance in the presence of inevitable non-idealities using an in-house so-called composite Floquet scattering matrix (CFSM) numerical method. We also validate the analysis with simulated and measured results using a standard 180 nm CMOS technology, showing good performance. Compared to previous discrete implementations of STM-AM circulators, the presented CMOS chip reduces the form factor by at least an order of magnitude and occupies a total area of only 36 mm2.
@article{arxiv.1902.06935,
title = {CMOS Integrated Magnetless Circulators Based on Spatiotemporal Modulation Angular-Momentum Biasing},
author = {Ahmed Kord and Mykhailo Tymchenko and Dimitrios Sounas and Harish Krishnaswamy and Andrea Alù},
journal= {arXiv preprint arXiv:1902.06935},
year = {2019}
}