Laminate & prepreg material reduces weave-induced skew

6th March 2015

Isola Group

Barney Scott

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Datasheet

Isola Group has announced the introduction of Chronon, the company’s latest ultra-low loss, high-speed laminate and prepreg materials engineered to mitigate skew issues in high-speed designs that have differential pairs. The introduction of Chronon, which follows the 2014 launch of Gigasync, expands the company’s portfolio of PCB materials to mitigate skew in high-speed designs.

Independent testing has confirmed the ability of Chronon materials to reduce weave-induced skew. Skew caused by the glass-weave effect can be as high as 130ps when trace lengths exceed 20”. Using test vehicles from Speeding Edge, an independent consultant to the PCB industry, the maximum skew on a horizontal 14” trace using Chronon materials was 5ps.

The maximum skew on a proprietary test vehicle from a large original equipment manufacturer was 1.79ps. Chronon laminates and prepreg are in the same UL family as Isola’s Tachyon-100G, I-Tera MT and Astra MT materials. PCBs manufactured from Chronon materials use the same parameters as Tachyon and Tachyon 100G products. Chronon materials are available with Reverse Treat Foil (RTF) and very low profile copper with 2μm surface roughness (Rz) copper foil, otherwise known as VLP-2 foil.

Tarun Amla, Executive Vice President and CTO, Isola, stated, “Numerous OEMs have expressed concerns about skew issues on high-speed designs. The introduction of GigaSync, and now Chronon, reduces these issues. Although there are pre-emphasis and equalization techniques to recover the eye diagram from a near-closed state, skew poses a unique challenge. The current practice to reduce skew, signal rotation, is only partially successful and comes at a high cost. Chronon specifically eliminates the need to route signals at 5.0° to 7.5° angles to the glass weave, which saves board space and reduces overall cost.”

Fred Hickman, Senior Director of High-Speed Digital Products, Isola, stated, “After we introduced GigaSync, designers praised its skew mitigation capabilities but noted its high dielectric constant (Dk) of 4.13. Chronon delivers a lower Dk of 3.64, a lower insertion loss, and mitigates skew better than competitive products in the market. Since the Dk matches the leading competitive high-speed digital product, Chronon materials provide an easy path for OEMs to attain more bandwidth on existing designs without having to generate new Gerber data. Chronon and Tachyon can also be used in hybrid designs since they share the same UL file.”

Samples are now available from Isola’s Arizona manufacturing facility.