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

Table 3

Summary of the PN results obtained by SpectreRF and ISF.

PN (dBc/Hz) @ 1 MHz frequency offset
Topology	SpectreRF	ISF
		1 μA	10 μA	100 μA	1 mA	10 mA
Colpitts	−96.25	−96.20	−98.33	−98.49	−98.50	−98.45
Hartley	−92.75	−92.79	−95.18	−94.36	−94.85	−95.29
Cross coupled	−102.66	−102.69	−102.84	−102.83	−102.84	−102.94