Measure IIP2 of Device Under Test

Use the IIP2 Testbench block to verify the input second-order intercept (IIP2) of a device under test (DUT).

Connect the blocks as shown in the model.

Set the parameters for DUT and the testbench.

Amplifier block:

• Available power gain — 10 dB

• Intercept points convention — Input

Mixer block:

• Available power gain — 5 dB

• Local oscillator frequency — 2.0 GHz

• Add Image Reject filter — on

• Intercept points convention — Input

• IP2 — 32 dBm

• Filter type — Highpass

• Implementation — Constant per carrier

• Passband edge frequency — 2.05 GHz

IIP2 Testbench block:

• Input frequency (Hz) — 2.1e9

• Output frequency (Hz) — 0.1e9

• Simulate noise (both stimulus and DUT internal) — off

Run the model. Since the mixer is preceded by a 10 dB amplifier you will see that the display shows an IIP2 value of 22 dBm. This is calculated using the rquation, IIP2_DUT = IIP2 of mixer – available power gain of amplifier = 22 dBm.