Comparative Analyses of Phase Noise in 28 nm CMOS LC Oscillator Circuit Topologies: Hartley, Colpitts, and Common-Source Cross-Coupled Differential Pair

Table 5

Summary of the PN results obtained by SpectreRF and ISF.

PN (dBc/Hz) @ 1 MHz frequency offset
Topology	1 GHz		100 GHz
	SpectreRF	ISF (1 μA)	SpectreRF	ISF (1 μA)
Colpitts	−115.31	−116	−77.06	−77.69
Hartley	−114.52	−114.85	−81.18	−81.38
Cross coupled	−123.7	−124.06	−74.78	−75.59