What is the reason for the delay difference between small and large signals in a cascaded AD641 structure, and is there a need for a delay mechanism between two cascaded AD641 chips?

Question

Accepted Answer

The delay difference between small and large signals in the AD641 is due to the internal structure of the device, which consists of multiple cascaded amplifiers. When a large signal is applied, the signal chain quickly goes into clamped mode, causing all subsequent stages to clamp and contribute to the log output rapidly. In contrast, a small signal takes more time to propagate through the stages and reach the clamped level, resulting in a slower log output response. This behavior is consistent whether using a single AD641 or two cascaded AD641 devices. There is no need for a delay mechanism between two cascaded AD641 chips; instead, it is recommended to locate the two devices as close together as possible to minimize any additional delay.

Popular Forums

Product Forums

Application Forums

Design Center Forums

Highlighted Webinar

Places

Libraries

Upcoming Learning & Events

Challenge Yourself!

What's Brewing

Places

Resources

Visit ContentZone

The Latest Read

New Release

Recent Technical Insights

Products Mentioned

AD641: FAQ