# CMOS Integrated Magnetless Circulators Based on Spatiotemporal Modulation Angular-Momentum Biasing

## TL;DR

This paper presents the first integrated CMOS circuit implementation of magnetless circulators using spatiotemporal modulation with angular-momentum biasing, achieving significant size reduction and practical chip-scale realization.

## Contribution

It introduces a novel CMOS IC design for spatiotemporally modulated magnetless circulators with a simplified topology and validated performance.

## Key findings

- Good agreement between simulated and measured results.
- Significant size reduction compared to previous implementations.
- Reliable performance in CMOS technology.

## 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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Source: https://tomesphere.com/paper/1902.06935