Abstract
In this paper, we present a chip-integrated receiver for electron paramagnetic resonance (EPR), designed for operation in the S-band (2-4 GHz). This EPR-on-a-chip receiver consists of a low-noise amplifier, followed by quadrature downconversion mixers and intermediate-frequency variable gain amplifiers. It also incorporates a frequency generation block. The chip is realized in a <tex>$0.13-m$</tex> SiGe BiCMOS technology and occupies an area of <tex>$1100 900\ m^2$</tex>. The receiver's measured input-referred voltage noise density within the band of interest is <tex>$720 pV/\textHz$</tex>. Proof-of-concept EPR measurements validate the proposed approach.
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