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5 Measurement Tips

Measurement Tips

The location and type of capacitors used for power-supply bypassing are crucial for high-frequency

amplifiers. The tantalum capacitors, C

and C

, do not need to be close to pins 8 and 4 on the PCB and

may be shared with other amplifiers. See the individual op amp data sheet for more information on proper

board layout techniques and component selection.

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-MSOP-2A Demonstration Fixture SBOU004A – June 1997 – Revised May 2006

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