CMOS Integrated Magnetless Circulators Based on Spatiotemporal
Modulation Angular-Momentum Biasing
release_nmrdxmk4prg4noskj7wvj3eea4
by
Ahmed Kord, Mykhailo Tymchenko, Dimitrios Sounas, Harish Krishnaswamy,, Andrea Alù
2019
Abstract
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.
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