IPC-2581B Test Cases

Link: http://www.ipc2581.com/b-test-cases/

Differential Pairs Length Matching and Termination Schemes

Links to practical length matching advice.

What your Differential Pairs Wish You Knew with Rick Hartley - AltiumLive Keynote - YouTube

Texas Instruments:  
High-Speed Layout Guidelines for Signal Conditioners and USB Hubs
AC-Coupling Between Differential LVPECL, LVDS, HSTL,and CML

Stack Exchange: USB Length Matching
https://electronics.stackexchange.com/questions/52851/usb-differential-pair-length

Differential Terminations - Dr. Johnson
http://www.sigcon.com/Pubs/edn/DifferentialTermination.htm 

A treatment of differential signaling and its design - Speeding Edge
https://www.speedingedge.com/PDF-Files/DiffSigDesign.pdf

Differential Pair Termination Schemes
Timing 101- The Case of the Split Termination - SiLabs

click on image to view

Source: Any-Frequency Precision Clocks - SiLabs 

That's it !

Inductors - Best Practices

Per the manufacturer datasheet your should NOT route traces or place vias under inductors.

DR1040 Series

click on image to view

Inductors generate magnetic fields which can couple to adjacent circuitry and induce unwanted current and voltages.

That's it !

DC Bias Effects on X5R & X7R Capacitors

If this capacitor was used as a bypass capacitor with 15V applied, the effective capacitance is not 4.7uF, but only 20% of 4.7uF, or 0.94uF.

See the TDK video link below for the explanation:

https://product.tdk.com/info/en/contact/faq/faq_detail_D/1432616875432.html

Related Links:

Operating Above Resonance - Dr Howard Johnson
EEVblog #626 - Ceramic Capacitor Voltage Dependency - YouTube

That's it !

Standard Resistor Value Calculator - Daycounter Inc

Click on me to Open the Calculator



Source:  Daycounter Inc

DPPM / FIT / MTBF Estimator - Texas Instruments

Source: Texas Instruments DPPM / FIT / MTBF Estimator

IPC Class 2 VS Class 3: The Different Design Rules

click on image to view

Source: IPC Class 2 VS Class 3: The Different Design Rules | Sierra Circuits Blog

Randy's Comments:

IPC specs do not dictate the pad size. It's all about the finished minimum annular ring.

The IPC criteria is 2 mil finished annular ring on external layers and 1 mil minimum on the internal layers. Class 3 pad sizes > drill + 12mil are imposed by fabricators who have > 4 mil layer to layer tolerances.  

It comes down to fabricators capability and process tolerances.  Smaller pads can be used if the fabricator has tight layer to layer tolerances.  

Just be aware that tighter (smaller) tolerances will impact yields and the costs will be passed to the customer.

The other noteworthy Class 3 requirement for vias is the via barrel wall plating must have an average minimum thickness of 1 mil.  Stringent class 3 fab notes will specify an absolute minimum thickness for the barrel plating.

That's it !