2-Tone Nonlinear Simulations > Spectrum, Gain, TOI and 5thOI Points

Description

This is the most basic simulation setup, and it simulates the spectrum, output power, power gain, and intermodulation distortion of a device or amplifier. A sample power amplifier is provided. You must replace this amplifier with your own device or amplifier, and modify the biases, as needed.

Needed to Use Schematic

A device or an amplifier using nonlinear model(s)

Main Schematic Settings

Center frequency of the two input tones, the frequency spacing between them, available source power (from both tones), and maximum order of the intermodulation terms to be computed. The source and load impedances at the fundamental and harmonic frequencies can also be set.

Data Display Outputs

• Broadband output spectrum and spectrum centered on the two fundamental output tones
• Output power (both tones)
• Transducer power gain (power (both tones) delivered to the load minus power available from the source (both tones))
• Input and output third-order intercept and fifth-order intercept points, calculated using the low side intermodulation and high side intermodulation distortion terms

Schematic Name

HB2Tone

Data Display Name

HB2Tone.dds

Note

When simulating a device, setting the source and load impedances at the fundamental and harmonic frequencies might be useful. However, when simulating an amplifier that already has source and load impedance matching networks, just leaving all these impedances at 50 ohms might be suitable.