rfchain

Create rfchain object

Description

Use the rfchain object to create an RF circuit cascade analysis object to calculate gain, noise figure, OIP3 ( output third-order intercept), and IIP3 (input third order intercept).

Creation

Syntax

rfobj = rfchain()

obj = rfchain(g, nf, o3, 'Name', nm)

obj = rfchain(g, nf, 'IIP3', i3, 'Name', nm)

Description

rfobj = rfchain() creates an RF chain object obj having zero stages. To add stages to the RF chain, use addstage method.

obj = rfchain(g, nf, o3, 'Name', nm) creates an RF chain object obj having N stages. The gain g, noise figure nf and the OIP3 o3 are vectors of length N . The name nm is a cell array of length N .

obj = rfchain(g, nf, 'IIP3', i3, 'Name', nm) creates an RF chain object having N stages, specifying an IIP3 for each stage, instead of an OIP3.

Properties

Numstages — Number of stages

scalar

Number of stages in an RF chain, specified as a scalar.

Data Types: double

Name — Name of each stage

character vector | string scalar

Name of each stage of an RF chain, specified as a character vector. This will always be a name-value pair.

Data Types: char | string

Gain — Gain of each stage

vector

Gain, in dB, of each stage in an RF chain, specified as a vector.

Data Types: double

NoiseFigure — Noise figure of each stage

vector

Noise figure, in dB, of each stage in an RF chain, specified as a vector.

Data Types: double

OIP3 — Output-referred third-order intercept

vector

Output-referred third-order intercept, in dB, of each stage in an RF chain, specified as a vector.

Data Types: double

IIP3 — Input-referred third-order intercept

vector

Input-referred third-order intercept, in dB, of each stage in an RF chain, specified as a vector.

Data Types: double

Examples

Create RF Chain Object, Add Stages, and View Results

Create an RF chain object.

rfch = rfchain;

Add stage 1 and stage 2 with gain, noise figure, oip3.

addstage(rfch, 21, 15, 30, 'Name', 'amp1');
addstage(rfch, -5, 6, Inf, 'Name', 'filt1');

Add stage 3 and stage 4 with gain, noise figure, iip3.

addstage(rfch, 7, 5, 'IIP3', 10, 'Name', 'lna1');
addstage(rfch, 12, 14, 'IIP3', 20, 'Name', 'amp2');

Calculate the gain, noise figure, oip3, and iip3 of each stage.

g = cumgain(rfch);
nf = cumnoisefig(rfch);
oip3val = cumoip3(rfch);
iip3val = cumiip3(rfch);

View the results on a table and plot it.

worksheet(rfch)

figure
plot(rfch)

Create RF Chain Adding Stage-By-Stage Values

Assign three 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);

View results in a worksheet.

worksheet(rfch)

Version History

Introduced in R2013b