Abstract
We propose the demonstration of a portable electron spin resonance (ESR) spectrometer using an integrated voltage-controlled oscillator (VCO) as both RF excitation source and ESR detector. As an extension to the work presented by our group in [1], in which we extracted the spectroscopic information from an ESR-induced change in the oscillation frequency, in the presented setup, we sense the ESR signal as a change of the VCO amplitude by utilizing the built-in AM-demodulation capabilities of an LC tank VCO [2]. This amplitude-sensitive approach not only greatly further reduces system complexity but also opens up the path towards more advanced ESR detection methods in addition to the conventional continuous-wave method used in [1].
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