ns_pwr_ref_bw()

Returns noise power in a reference bandwidth

Syntax
y = ns_pwr_ref_bw(Sji, nf, resBW)

Arguments

Name	Description	Range	Type	Required
Sji	complex transmission coefficient	(-∞, ∞)	complex	yes
nf	noise figure at the output port (in dB)	(-∞, ∞)	complex	yes
resBW	user-defined resolution bandwidth	(-∞, ∞)	complex	yes

Examples

Y = ns_pwr_ref_bw(S21, nf2, 1MHz)
returns the noise power with respect to the reference bandwidth

Defined in

$HPEESOF_DIR/expressions/ael/rf_system_fun.ael

See Also

ns_pwr_int(), snr()

Notes/Equations

Used in Small-signal S-parameter simulation.
This is the noise power calculated by multiplying the noise spectral density at a frequency point by a user-defined resolution bandwidth. Unlike NsPwrInt, this gives the noise power (in dB) at each frequency sweep.

The ns_pwr_ref_bw() function ignores noise from the load. It will always take into account the noise from the source resistor to be fixed at 290K. You can raise the temperature of the source resistor (Term), or set Noise to no in the source resistor (Term), or set Noise to yes in the load resistor. These actions will not change the ns_pwr_ref_bw() results.