Basics Of Rf Amplifier Test With The Vector Net... ⟶

Derived from the phase of S21, this measures the time delay of the signal through the device. Consistent group delay is vital for maintaining signal integrity in wideband communications.

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...

Allow both the VNA and the amplifier to reach thermal equilibrium (typically 15–30 minutes) for stable measurements. 2. Calibration (The Foundation) Derived from the phase of S21, this measures

If your amplifier has a DC bias on the RF lines, use DC blocks to prevent damaging the VNA’s bridge circuitry. A lower S11 (e

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.

This shows the amplifier's gain across the frequency sweep. Look for "flatness" (minimal variation) over the desired bandwidth.

Some VNAs can tune their receivers to multiples of the source frequency to measure second and third harmonics generated by the amplifier.