Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice User Guide AC analyses October 2019 505 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Analyzing Noise in the Probe window You can use these output variable formats to view traces for device noise contributions and total input or output noise at every frequency in the analysis. For a break down of noise output variables by supported device type, see Table 17-17 on page 764. To view this... Use this output variable... Which is represented by this equation 1 ... Flicker noise for a device NFID(device_name) NFIB(device_name) noise ∝ Shot noise for a device NSID(device_name) NSIB(device_name) NSIC(device_name) For diodes and BJTs: noise ∝ For GaAsFETs, JFETs, and MOSFETs: noise ∝ Thermal noise for the RB, RC, RD, RE, RG, or RS constituent of a device, respectively NRB(device_name) NRC(device_name) NRD(device_name) NRE(device_name) NRG(device_name) NRS(device_name) noise ∝ Thermal noise generated by equivalent resistances in the output of a digital device NRLO(device_name) NRHI(device_name) noise ∝ Total noise for a device NTOT(device_name) Sum of all contributors in device_name Total output noise for the circuit NTOT(ONOISE) RMS-summed output noise for the circuit V(ONOISE) RMS sum of all contributors k f I a f f b ----- ⋅ 2qI 4kT I d V d ------- 2 3 -- ⋅ ⋅ 4kT R ---------- 4kT R ---------- NTOT device ( ) device NTOT ONOISE ( ) ( )