Design and optimization of a CMOS IC novel RF tracking sensor

Abstract

Summary This research reports the development of an RF sensor integrated circuit (IC) chip capable of tracking the directionality of RF remote emissions. The IC design uses an angle‐of‐arrival algorithm, and it is designed for the 180 nm CMOS technology and applicable to other technologies, also. The sensor chip requires two pairs of antennas aligned and placed at distance s for detection of azimuthal and polar angles of the RF incident wave. The circuit consists of custom designed low‐noise amplifiers (LNAs) at the front end, with a novel design of double‐balanced Gilbert cell mixers (GCMs). This amplifies and mixes the signals from the antennas and converts the phase difference Δφ into an equivalent output voltage map suitable for an 18‐bit analog to digital converter. Systematic optimization techniques were developed to maximize the third‐order intercept point and suppress flicker noise for the LNAs and GCMs, resulting in improved sensing accuracy. The overall system‐level evaluation results showed state‐of‐art angle‐of‐arrival sensing capability with an upper limit error of 3.447°.

Novel Approach and Methods for Optimizing Highly Sensitive Low Noise Amplifier CMOS IC Design for Congested RF Environments

“…A cascode amplifier with inductive load and degeneration is appropriate for such a design goal and selected for evaluation in our work. Various different topologies can be applied for the implementation of LNAs, including common source [4,5], common gate [6,7], and cascode amplifiers [8,9]. In addition, resistive feedback [10] and noise-cancelling [11] LNAs are available options depending on the focus of design.…”