Linear Technology AN128 Application Note 128 Wideband Amplifier Settling Time Measurement

About this manual

This document addresses the challenges of verifying precision operation at high speeds in instrumentation and data acquisition systems. It defines amplifier settling time as the elapsed time from input application until the output remains within a specified error band, noting that this metric involves delay, slew, and ring times.

The text critiques traditional measurement circuits for producing misleading results due to pulse generator aberrations and oscilloscope overdrive issues. It proposes an improved conceptual circuit using a current-switching technique and a sample gate multiplier to eliminate these errors, allowing for accurate nanosecond-range settling time measurements.

What's inside

• Introduction
• Settling Time Defined
• Considerations for Measuring Nanosecond Region Settling Time
• A Precision Wideband Amplifier with 9ns Settling Time
• Practical Nanosecond Settling Time Measurement

Specifications

Frequently asked questions

What is the settling time of the L1818 Op Amp?

The L1818 Op Amp has a settling time of 9ns to 0.1% for a 5V step.

What is the settling time of the L1818 amplifier for a 5V step?

The L1818 Op amp has a settling time of 9ns to 0.1% for a 5V step.

What is the maximum capacitive loading permissible at unity gain?

The output can handle up to 20pF of capacitive loading at unity gain.

What is the minimum required rise time for the input pulse generator?

The input pulse generator must have a rise time of about 1 nanosecond.