1-Tone Nonlinear Simulations > Large-Signal Load Impedance Mapping

Description

This simulates the input reflection coefficient of a device, as a function of the impedance presented to its output (the load impedance). If the load impedances map to the outside of the Smith chart when looking into the input port, the device is potentially unstable. The input signal power can be set arbitrarily. The load values correspond to several of the main lines on the Smith chart. A sample device 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

Input frequency and power, maximum number of load impedances simulated and maximum load reflection coefficient (between 0 and 1).

Data Display Outputs

• Smith chart with simulated load impedances
• Input reflection coefficients that correspond to the load impedances
• Maximum output power, power gain, and load impedance corresponding to the maximum (from among the load impedances simulated)
• Output power, power gain, and voltage gain that correspond to a marker on the input reflection coefficient plot

Schematic Name

LoadMapper

Data Display Name

LoadMapper.dds