Noise Figure Testbench

Measures noise figure of system

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Libraries:
RF Blockset / Circuit Envelope / Testbenches

Description

Use the Noise Figure Testbench to measure the noise figure (NF) of an RF device under test (DUT).

Examples

Spot Noise Data in Amplifiers and Effects on Measured Noise Figure

A test bench model to describe the noise introduced by a 2-port device.

• Open Script

Measure Noise Figure of Device Under Test

Example for Noise Figure Testbench block.

• Open Script

Parameters

Parameters

Use Internal Configuration block — Use testbench internal configuration block

on (default) | off

Select to use testbench internal configuration block. Clear this parameter to specify your own configuration block.

Note

When using your own configuration block, parameters such as step size, fundamental tones, harmonic order, and simulate noise may affect the measured results.

Simulate noise (both stimulus and DUT internal) — Enable noise modeling in stimulus signal

on (default) | off

Select to enable noise modeling in the stimulus signal entering the DUT and inside the DUT. In the NF testbench, this parameter is permanently disabled because stimulus noise is required for meaningful noise calculation.

Dependencies

To enable this parameter, select Use internal Configuration block.

Input power amplitude (dBm) — Input power to DUT

-30 (default) | scalar

Input power to DUT, specified as a scalar in dBm. You can change the input power by entering the value in the text box or selecting a value using the knob. The specified input power represents the power available at the input ports of the DUT. The valid values are between -90 dBm and 60 dBm.

Input frequency (Hz) — Carrier frequency of DUT

2.1e9 (default) | scalar

Carrier frequency of the DUT, specified as a scalar in Hz. Input frequency must greater than baseband bandwidth.

Output frequency (Hz) — Output frequency of DUT

2.1e9 (default) | scalar

Output frequency of DUT, specified as a scalar in Hz. Output frequency must greater than baseband bandwidth.

Baseband bandwidth (Hz) — Baseband bandwidth of input signal

10e6 (default) | scalar

Baseband bandwidth of input signal, specified as a scalar in Hz. The value must be greater than zero.

Source impedance (Ohm) — Source impedance to measure DUT

50 (default) | complex finite scalar

Source impedance to measure DUT, specified as a complex finite scalar in ohms. The real part of the impedance must be positive.

Clear noise history — Clear noise history

button (default)

Use this button to clear noise history used for internal noise measurement. When a DUT has an initial settling time duration, it is recommended to clear noise history after this duration. This improves the accuracy and convergence of noise measurement.

Show Response spectrum — View response spectrum using a spectrum scope during simulation

on (default) | off

Select to view response spectrum using a spectrum scope during simulation.

Ground and hide negative terminals — Internally ground and hide RF circuit terminals

on (default) | off

Select to internally ground and hide the negative terminals. Clear to expose the negative terminals. By exposing these terminals, you can connect them to other parts of your model.

References

[1] Razavi, Behzad. RF Microelectronics. Upper Saddle River, NJ: Prentice Hall, 2011.

[2] Grob, Siegfried and, Jurgen Lindner. “Polynomial Model Derivation of Nonlinear Amplifiers”. Department of Information Technology, University of Ulm, Germany.

Version History

Introduced in R2018a