Linear Systems DMOS High-Speed Switches: Precision Switching for Demanding Applications

JC - Linear Systems
Sep 8
2 min read

High-speed analog switching is essential in systems where signal integrity, bandwidth, and reliability cannot be compromised. Linear Systems’ DMOS High-Speed Switches are designed to provide fast, low-distortion switching with the stability required in precision applications.

Key Advantages of DMOS High-Speed Switches

Fast switching speeds – Turn-on times as low as 1 ns and turn-off times around 3 ns.
Low on-resistance (RON) – Minimizes signal loss and distortion, improving overall system accuracy.
Low charge injection and low leakage – Ensures clean signal transitions with minimal artifacts.
Wide bandwidth operation – Suitable for applications extending into RF and video frequencies.
High off-isolation – Reduces crosstalk between channels in complex switching systems.

Typical Applications

These characteristics make DMOS high-speed switches an excellent choice for:

Video and RF routing – Preserving signal fidelity in high-frequency paths.
Data acquisition systems – Used in multiplexers, sample-and-hold circuits, and front-end switching for A/D converters.
Programmable filters and signal conditioning – Allowing reconfigurable designs without introducing switching artifacts.
Video overlay and instrumentation – Adding signals to analog video streams cleanly, without visible distortion.
Audio switching and de-glitching – Quiet, low-distortion switching in sensitive analog audio paths.

Example: SD5000 Series

The SD5000 Series from Linear Systems illustrates the advantages of this technology:

Quad N-channel lateral DMOS FET switch
Zener diode protection for improved reliability
Pin-for-pin replacement for legacy Siliconix parts
Available in PDIP, SOIC, ceramic, or as bare die for hybrid modules

Screening and test options are available for applications requiring additional reliability.

Summary

DMOS High-Speed Switches combine low on-resistance, high speed, and low charge injection to deliver reliable analog switching for video, RF, data acquisition, and audio systems. For engineers designing high-performance instrumentation or communication equipment, they provide a proven and stable solution where signal fidelity is critical.