Fig. 3: Synchronization with injection locking at 2.4 GHz.
a, b Emitted power spectra of four synchronized oscillators with dc bias only (green) and with both dc bias and rf input (brown) in parallel (a) (series (b)) configuration at Idc = 3.4 mA (1.3 mA) and H = 150 Oe (120 Oe), respectively. c, d STO frequency (f0) versus radio frequency (frf) response for a single oscillator (red) and four oscillators (blue) at Prf = −20 dBm for the parallel (c) and series (d) connection. The locking range (dotted green line) defines the region where f0 ~ frf. e, f The emitted power and linewidth of synchronized oscillators as a function of applied rf power (Prf) at Idc = 3.4 (1.3 mA) for the parallel (series) configuration, respectively.
