FET Switch Speed and Settling Time

Application Notes

Introduction

The traditional measure of digital switching – the speed of moving to 90% on or 90% off – is typically a strength of FET switches. With good driver circuits, MWTC switches have been shown to switch within 5 nS; with exceptional drivers they have shown switching time less than 1 nS.

Many instrument applications have a much more demanding specification, requiring that the switch settle to within 0.3, 0.1, or 0.01 dB of the final value. Unfortunately, the total settling time for GaAs FET switches can be significantly longer than one or two extra time constants. This effect has been seen in several manufacturer’s GaAs switches; although most data sheets do not reference settling time, we believe this problem is present throughout the industry.

This application note explains the occurrence, the reasons, and some of the possible solutions for this “slowtails” FET switch behavior

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FET Switch Speed and Settling Time

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