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

Description

This simulation setup is identical to the HB2Tone schematic, except that available source power (in both tones) is swept. It simulates the spectrum, output power, power gain, and intermodulation distortion of a device or amplifier all versus the available source power. 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, maximum order of the intermodulation terms to be computed, and swept values of the available source power (from both tones). The available source power sweep is divided into two parts, one coarse, and the other fine, for better resolution when the amplifier is being driven into compression. The source and load impedances at the fundamental and harmonic frequencies can also be set.

Data Display Outputs

All versus the available source power (in both tones):

• Broadband output spectrum and spectrum centered on the two fundamental output tones (at one available source power selected by moving a marker)
• Output power (both tones)
• Transducer power gain (power (both tones) delivered to the load minus power available from the source (both tones)), in a plot and a listing column
• Gain compression
• Plots of third- and fifth-order intermodulation distortion versus output power
• 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

HB2TonePswp

Data Display Name

HB2TonePswp.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, leaving all these impedances at 50 ohms might be suitable.