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October 2005



Using Mathcad to solve for L and C from Z0 and TD

Monday, 31 October 2005 8:55 P GMT-06
A common system of equations in electromagnetics is the relationship between inductance per unit length (L), capacitance per unit length (C), characteristic impedance (Z0), and time delay per unit length (TD). There are two equations, and thus any
Category: High Speed Digital Design

RLGC model for differential twisted pair cable

Sunday, 30 October 2005 9:56 P GMT-06
There are several parameters required for a twisted pair cable model that is valid for data rates up to about 500 Mbps. This article describes what these parameters are and how they can be obtained. The first parameter required is the cable skew
Category: High Speed Digital Design

Cabling Considerations for Digital Communications

Thursday, 20 October 2005 6:21 P GMT-06
The question recently came up in determining a system architecture. Here is the scenario 150 Mbps data transmission All signals are unidirectional and differential LVDS Cable is a shielded twisted pair Data is not coded in a DC balanced way The ques
Category: High Speed Digital Design

How Many Prototypes Should be Built?

Wednesday, 19 October 2005 10:14 P GMT-06
My experience is that you need to build at least 7 prototypes for a circuit board design in order for all verification efforts to run smoothly. It is inevitable that at least one prototype from any given build will have some manufacturing defect th
Category: Digital System Architecture

Intermittent failures in electronic systems

Monday, 17 October 2005 6:10 P GMT-06
Intermittent failures or errors is one of the most frustrating problems in electronic systems to debug. They often occur sporadically and can't easily be forced to occur at will. It is challenging to have the right equipment attached and active to
Category: Digital System Architecture

Spreadsheets vs. Worksheets for Engineering Calculations

Thursday, 13 October 2005 8:51 P GMT-06
I first learned to use a spreadsheet for engineering calculations in college. In those days we used Quattro Pro for DOS before windows applications were common. Spreadsheets provide a lot of powerful features for engineering calculations such as
Category: Engineering Profession

ROHS Redesign Costs

Thursday, 6 October 2005 6:14 P GMT-06
Many electronic products will need to be redesigned in order to be ROHS compliant. In many cases the redesign effort consists of simply changing the non ROHS parts in the bill of materials for pin compatible drop in replacement ROHS compliant parts
Category: Digital System Architecture

Environmental Regulations for the Electronics Industry (ROHS)

Monday, 3 October 2005 6:26 P GMT-06
Consumer electronics products have exploded in the marketplace over the past 25 years. The rapid pace of technological advancement in recent years coupled with the low cost of consumer electronics devices has led to a lot of electronics ending up i
Category: Digital System Architecture