Set the VNA source power low enough to ensure the amplifier stays in its linear region . If the VNA power is too high, the amplifier will saturate, leading to inaccurate S-parameter data. 3. Key S-Parameter Measurements
Indicates how well the input impedance matches the system (usually 50Ω). A lower S11 (e.g., < -10 dB) means less power is reflected back to the source. Basics of RF Amplifier Test with the Vector Net...
Once calibrated and connected, you focus on the four primary S-parameters: Set the VNA source power low enough to
By performing a Power Sweep at a fixed frequency, you find the input power level where the gain drops by 1dB. This defines the limit of the linear range. the amplifier will saturate