CSKF-Type
LTCC Multi-layered Differential Skew Correction Device

Features

The differential skew which occurs between ultra-high speed differential signals causes signal degradation and contributes to signal receiving errors. In general, differential signal skew is improved even with the use of a common mode choke coil; however, if the interval skew becomes quite large, as the line interval phase frequency aligns in the signal band width, not only will the components of the differential signal be eliminated, because the preceding and succeeding differential signal components will also be greatly attenuated, even if a common mode choke coil is utilized, recovering the wave form will be very difficult.

In order to solve this problem, an LTCC(Low-Temperature Co-fired Ceramic)Chip-Type Differential Signal Skew Correction Device, CSKF-Type(RoHS-compliant component)has been developed.

We have created a set of components for use with high-frequency DC～, high-bandwidth differential signals, for which only our product, with its passive element construction, using an ultra-high speed delay element(maintains a 10GHz bandwidth differential Group Delay Time difference), can work with differential delay time differences of 10ps～100ps.Whichever component you use, you can cancel your differential skew.

Especially with large line interval skew, this product is well-suited for recovering the components of the differential signal.

Also, the most suitable Chip Delay Line Socket for differential Phase Adjustment(CS-type)is also available. While observing the Differential Signal Wave Form, by remounting, changing, rotating 180˚, etc., you can determine the best Part Number for your differential Delay Time difference.

This product’s shortest In/Output Delay Time is between the 2-pin－7-pin; however, by inserting a Delay Time, you can correct the differential signal skew and delay the differential signal at the same time.

If you have any questions, please let us know.

Care and Handling of LTCC Products

Common Specifications(provisional)

(1)*Using the suggested land pattern and selecting the appropriate part number for the value of the input signal differential line interval skew.

Package Dimensions & Pin Configuration(provisional) Unit:mm(inch) Tolerance:±0.1(±0.004)
	2pin－7pin：Shortest Time Connection 3pin－6pin：Delay Time Connection
Suggested Land Pattern Unit:mm(inch) Tolerance:±0.1(±0.004)

Tape and Reel specifications

Application Examples

CSKF-Type 　　　　　　　　　　Delay Difference：ts	Connect GND terminal when using this component. （Please See Note.）
	Input ts (Skew) signal into the CSKF Input. （＋side is delayed.）
	Upon exiting the CSKF, the Skew is corrected.
In the wave form examples above, +signal and -signal are separated to ease understanding.

Characteristics Examples(Electro-magnetic Simulation, SPICE)

Input Signal：1.5GHz Clock; Rise/Fall Time：30ps(20％－80％) CSKF010P(Skew：Positive side is delayed 10ps) Top: Positive/Negative Wave Form Bottom: Common Mode Noise Wave Form Common Mode Noise Spectrum Wave Form (V(1)+V(2))/2 (V(3)+V(4))/2 (V(1)+V(2))/2 (V(3)+V(4))/2 CSKF050P(Skew：Positive side is delayed 50ps) Top: Positive/Negative Wave Form Middle: Common Mode Noise Wave Form Bottom: Common Mode Noise Spectrum Wave Form Sdd21 Differential Signal Pass-thru Amplitude Characteristics 50ps skew developmentComparison of no skew correction and with CSKF050P No skew correction with CSKF050P [Re: No skew correction wave form] 1cycle at 10GHz is 100ps; with a 1/2cycle 50ps phase divergence, the differential signal will completed align. Therefore, if a 50ps skew occurs in a differential signal , it will be cut off at 10GHz. (V(1)+V(2))/2 (V(3)+V(4))/2 (V(1)+V(2))/2 (V(3)+V(4))/2 CSKF100P(Skew：Positive side is delayed 100ps) Top: Positive/Negative Wave Form Sdd21 Differential Signal Pass-thru Middle: Common Mode Noise Wave Form Amplitude Characteristics Bottom: Common Mode Noise Spectrum Wave Form 100ps skew development Comparison of no skew correction and with CSKF100P No skew correction with CSKF100P [Re: No skew correction wave form] 1cycle at 5GHz is 200ps; with a 1/2cycle 100ps phase divergence, the differential signal will completed align. Therefore, if a 100ps skew occurs in a differential signal , it will be cut off at 5GHz and the next elevated odd-numbered frequency. (V(1)+V(2))/2 (V(3)+V(4))/2 (V(1)+V(2))/2 (V(3)+V(4))/2