Source:
Using Remote Sensing to Ensure Accurate Point of Load Voltage Control | VicorPowerBlog:
'via Blog this'
Friday, March 30, 2018
Using Remote Sensing - Vicor
Source:
Using Remote Sensing to Ensure Accurate Point of Load Voltage Control | VicorPowerBlog:
'via Blog this'
Monday, March 19, 2018
Saturday, March 10, 2018
Calculate Distributed Line Length
Distributed element wavelengths occur at fractional wavelengths.
1/4 for Digital Paths
1/12 for RF Paths
1/16 for Analog Paths
Use the Saturn PCB Toolkit v7.05 to calculate lumped / distributed wavelengths.
Note that 1/Time = Freq and 1/Freq = Time, they are reciprocals.
In the Saturn PCB Toolkit select the Wavelength Calculator tab.
Example:
Select the Period to enter the edge rate transition time.
Enter 1nS for the Risetime period. (10% to 90%)
Enter the Er Eff (effective Er (Dk) Dielectric Constant.
Set Wavelength Divide to 1/4 Wave Length.
click on image to view
As shown above the distributed 1/4 wavelength = 1.46 inches for a rise time of 1 nS.
Paths shorter than this length are lumped lengths and longer lengths are distributed length paths. Distributed lengths should be impedance controlled paths.
Something for the RF Geeks: Quarter Wave Tricks
Something for Everyone: Admiral Grace Hopper Explains the Nanosecond
Who is Grace Hopper? - YouTube
That's it !
1/4 for Digital Paths
1/12 for RF Paths
1/16 for Analog Paths
Use the Saturn PCB Toolkit v7.05 to calculate lumped / distributed wavelengths.
Note that 1/Time = Freq and 1/Freq = Time, they are reciprocals.
In the Saturn PCB Toolkit select the Wavelength Calculator tab.
Example:
Select the Period to enter the edge rate transition time.
Enter 1nS for the Risetime period. (10% to 90%)
Enter the Er Eff (effective Er (Dk) Dielectric Constant.
Set Wavelength Divide to 1/4 Wave Length.
click on image to view
As shown above the distributed 1/4 wavelength = 1.46 inches for a rise time of 1 nS.
Paths shorter than this length are lumped lengths and longer lengths are distributed length paths. Distributed lengths should be impedance controlled paths.
Something for the RF Geeks: Quarter Wave Tricks
Something for Everyone: Admiral Grace Hopper Explains the Nanosecond
Who is Grace Hopper? - YouTube
That's it !
Friday, March 9, 2018
Rounded Rectangle Pad Shape - PCB Libraries Forum
Illustrations of solder joints of rectangle pads, note there is no solder in the corners after reflow.
PCB manufacturer's have long recommended Rounded Corner SMD pad shape for several reasons. Better stencil release and paste mask stencil apertures are normally corner radius.
Source: Rounded Rectangle Pad Shape - PCB Libraries Forum:
'via Blog this'
