Op-Amp Gain and Phase Measurement Fixture

  • AD8055
  • Zout = 50Ω
  • Gain = 1
  • Input = -17dBm


Schematic


Fixture Response


Fixture Response Post Calibrate



LM741 Non-Inverting Amplifier


  • Gain = 1760/216 + 1 = 9.15 = 19.2dB
  • Input = -17dBm
  • 20kHz Oscilloscope gain = 289.8/31.74 = 9.13 = 19.2dB


Input = 20kHz


Input = 580kHz


VNWA S21 Add 20dB pad to Port 2


VNWA S21 Bode Plot
Calibration with 20dB pad on Port 2