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. 2015 Dec 11;5:18134. doi: 10.1038/srep18134

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(a) Spectra of the RF signal generated by the STO under different bias voltages. These spectra are observed by a spectrum analyzer with a frequency span of 200 MHz and resolution bandwidth of 1 MHz. (b) Peak frequency and (c) amplitude as a function of bias voltage. Agility is the slope of the frequency around the nominal bias point of V_B = 126.4 mV.