Picosecond offers two high-speed pulse sources specifically designed for TDR/TDT applications - The Model 4020 Single-ended Source Enhancement Module and the Model 4022 Differential Source Enhancement Module.
The ultra-fast pulse risetime of the 4020 and the 4022 provides a 2.5X-4X improvement over other commercially available TDR and TDT pulse sources.
The resolution performance of the Models 4020 and 4022 are detailed in the PSPL technical paper, "High Resolution TDR Measurements Using the PSPL Models 4020 and 4022 9 ps TDR Source Enhancement Modules".
One TDR application that benefits significantly from higher resolution is package substrate analysis. A customer paper is available for download that details high-resolution package substrate TDR measurements and analysis - "Realization of Ultra-Wideband High-Resolution TDR for Chip-Carrier Packages".
As a complement to the Model 4020 and 4022, PSPL also offers the Model 4022-DAK TDR/T Probe Connector Adapter Kit and the Model 4022-DBK TDR/T Full Connector Adapter Kit.