Feature: RF


Figure 7: Simulated gain and noise figure vs. temperature for ADPA7007, an 18-44GHz, 1W power amplifier


RF power level, where the input signal is a 1MSPS, 16-QAM carrier driving a 50MHz-4GHz gain block, ADL5602. This shows excellent correlation between measurement and simulation at both low and high power levels. The default sys-parameter dataset


in the ADI library contains only ambient temperature data. However, the model can be expanded by adding additional tabs to the dataset that contains temperature data. Figure 7 shows the dataset for ADPA7007, an 18GHz-44GHz, 1W power amplifier. The individual tabs show the same gain, noise and distortion data but at -55°C, +25°C and +85°C. The Genesys and SystemVue simulators use these three datapoints to generate interpolated data at other temperatures.


Figure 8: Using sys-parameter data in Keysight ADS using the Amplifier2 model


36 April 2022 www.electronicsworld.co.uk


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