rfchain.cumnoisefig

Cascaded noise figure of the RF chain object

Syntax

nf = cumnoisefig(obj)

Description

nf = cumnoisefig(obj) returns the cascaded noise figure for each stage for RF chain object obj. The syntax first calculates the noise factor and then the noise figure. The formulae used are:

$\begin{array}{l} n o i s e f a c t o r (t o t a l) = n o i s e f a c t o r (1) + (n o i s e f a c t o r (2) - 1) / g 1 + (n o i s e f a c t o r (3) - 1) / g 1 + g 2 + ..... \end{array}$

$n o i s e f i g u r e = 10 * \log 10 (n o i s e f a c t o r)$

example

Examples

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Calculate Cascaded Noise Figure

Open Live Script

Assign stage-by-stage values of gain, noise figure, OIP3 and stage names.

g = [11 -3 7];
nf = [25 3 5];
o3 = [30 Inf 10];
nm = {'amp1','filt1','lna1'};

Create an RF chain object.

rfch = rfchain(g,nf,o3,'Name',nm);

Calculate cascaded noise figure.

noisefig = cumnoisefig(rfch)

noisefig = 1×3

   25.0000   25.0011   25.0058

Input Arguments

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`obj` — RF chain object
`rfchain` object

RF chain object, specified as an rfchain object.

Output Arguments

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`nf` — Cascaded noise figure
vector

Cascaded noise figure for RF chain object, returned as a vector. The vector length is equal to the number of stages in the RF chain object.

Version History

Introduced in R2014b

rfchain.cumnoisefig

Syntax

Description

Examples

Calculate Cascaded Noise Figure

Input Arguments

obj — RF chain object rfchain object

Output Arguments

nf — Cascaded noise figure vector

Version History

See Also

`obj` — RF chain object
`rfchain` object

`nf` — Cascaded noise figure
vector