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5 Measurement Tips
Measurement Tips
This demonstration fixture, with the component values shown, is designed to operate in a 50 Ω
environment; most data sheet plots are obtained under these conditions. It is easy to change the
component values for different input and output impedance levels. However, do not use high-impedance
probes; they represent a heavy capacitive load to the op amp, and will alter the amplifier response.
Instead, use low-impedance ( ≤ 500 Ω ) probes with adequate bandwidth. The probe input capacitance and
resistance set an upper limit on the measurement bandwidth. If a high-impedance probe must be used,
place a 100 Ω resistor on the probe tip to isolate its capacitance from the circuit.
4 DEM-OPA-SO-2D Demonstration Fixture SBOU002A – May 1998 – Revised May 2006
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