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What's the meaning of Electrical Inches?
Competing PCB Crystal layout recommendationsCrystal, PCB LayoutDDR bus design reviewPower origin and power planes placement on PCBBGA decoupling capacitors placementDotStar Micro LED Strip individual capacitor need and PCB questionsLinear Regulator PCB placementHow do you know if impedance is the same for 2 ICs?Odd PCB Layout for Voltage Regulator
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I was reading a PCB design notes and guidelines from Xilinx for their 7 series FPGAs and came across this sentence:
The capacitors should be placed as close as possible to the FPGA. Any
placement within two electrical inches of the device’s point of load
is acceptable.
What is the meaning of electrical inches ?
pcb pcb-design
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
$endgroup$
add a comment
|
$begingroup$
I was reading a PCB design notes and guidelines from Xilinx for their 7 series FPGAs and came across this sentence:
The capacitors should be placed as close as possible to the FPGA. Any
placement within two electrical inches of the device’s point of load
is acceptable.
What is the meaning of electrical inches ?
pcb pcb-design
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
$endgroup$
3
$begingroup$
I would think the wires/traces length
$endgroup$
– Eugene Sh.
8 hours ago
3
$begingroup$
I had to suspect inches honoring bends in your tracks. Not just a radius.
$endgroup$
– Janka
8 hours ago
$begingroup$
I wonder if this wire distance needs to be reduced according to the dielectric velocity factor?
$endgroup$
– hotpaw2
6 hours ago
add a comment
|
$begingroup$
I was reading a PCB design notes and guidelines from Xilinx for their 7 series FPGAs and came across this sentence:
The capacitors should be placed as close as possible to the FPGA. Any
placement within two electrical inches of the device’s point of load
is acceptable.
What is the meaning of electrical inches ?
pcb pcb-design
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
$endgroup$
I was reading a PCB design notes and guidelines from Xilinx for their 7 series FPGAs and came across this sentence:
The capacitors should be placed as close as possible to the FPGA. Any
placement within two electrical inches of the device’s point of load
is acceptable.
What is the meaning of electrical inches ?
pcb pcb-design
pcb pcb-design
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
asked 9 hours ago
AdoobIIAdoobII
417 bronze badges
417 bronze badges
3
$begingroup$
I would think the wires/traces length
$endgroup$
– Eugene Sh.
8 hours ago
3
$begingroup$
I had to suspect inches honoring bends in your tracks. Not just a radius.
$endgroup$
– Janka
8 hours ago
$begingroup$
I wonder if this wire distance needs to be reduced according to the dielectric velocity factor?
$endgroup$
– hotpaw2
6 hours ago
add a comment
|
3
$begingroup$
I would think the wires/traces length
$endgroup$
– Eugene Sh.
8 hours ago
3
$begingroup$
I had to suspect inches honoring bends in your tracks. Not just a radius.
$endgroup$
– Janka
8 hours ago
$begingroup$
I wonder if this wire distance needs to be reduced according to the dielectric velocity factor?
$endgroup$
– hotpaw2
6 hours ago
3
3
$begingroup$
I would think the wires/traces length
$endgroup$
– Eugene Sh.
8 hours ago
$begingroup$
I would think the wires/traces length
$endgroup$
– Eugene Sh.
8 hours ago
3
3
$begingroup$
I had to suspect inches honoring bends in your tracks. Not just a radius.
$endgroup$
– Janka
8 hours ago
$begingroup$
I had to suspect inches honoring bends in your tracks. Not just a radius.
$endgroup$
– Janka
8 hours ago
$begingroup$
I wonder if this wire distance needs to be reduced according to the dielectric velocity factor?
$endgroup$
– hotpaw2
6 hours ago
$begingroup$
I wonder if this wire distance needs to be reduced according to the dielectric velocity factor?
$endgroup$
– hotpaw2
6 hours ago
add a comment
|
2 Answers
2
active
oldest
votes
$begingroup$
"Electrical inches" is shorthand for "inches of trace along which the electrons must flow". In other words, it's the length of the wires or traces, following any bends, not the straight-line distance.
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
$endgroup$
add a comment
|
$begingroup$
An electrical inch is the actual distance along an electrical path.
Source: UltraScale Architecture
PCB Design from xilinx.com
Footnote on page 19
Referred to as "Added footnote with definition of electrical inch to 0805 Ceramic Capacitor" in revision history (version 1.6).
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
$endgroup$
add a comment
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Your Answer
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
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active
oldest
votes
$begingroup$
"Electrical inches" is shorthand for "inches of trace along which the electrons must flow". In other words, it's the length of the wires or traces, following any bends, not the straight-line distance.
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
$endgroup$
add a comment
|
$begingroup$
"Electrical inches" is shorthand for "inches of trace along which the electrons must flow". In other words, it's the length of the wires or traces, following any bends, not the straight-line distance.
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
$endgroup$
add a comment
|
$begingroup$
"Electrical inches" is shorthand for "inches of trace along which the electrons must flow". In other words, it's the length of the wires or traces, following any bends, not the straight-line distance.
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
$endgroup$
"Electrical inches" is shorthand for "inches of trace along which the electrons must flow". In other words, it's the length of the wires or traces, following any bends, not the straight-line distance.
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
answered 8 hours ago
Dave Tweed♦Dave Tweed
138k11 gold badges175 silver badges301 bronze badges
138k11 gold badges175 silver badges301 bronze badges
add a comment
|
add a comment
|
$begingroup$
An electrical inch is the actual distance along an electrical path.
Source: UltraScale Architecture
PCB Design from xilinx.com
Footnote on page 19
Referred to as "Added footnote with definition of electrical inch to 0805 Ceramic Capacitor" in revision history (version 1.6).
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
$endgroup$
add a comment
|
$begingroup$
An electrical inch is the actual distance along an electrical path.
Source: UltraScale Architecture
PCB Design from xilinx.com
Footnote on page 19
Referred to as "Added footnote with definition of electrical inch to 0805 Ceramic Capacitor" in revision history (version 1.6).
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
$endgroup$
add a comment
|
$begingroup$
An electrical inch is the actual distance along an electrical path.
Source: UltraScale Architecture
PCB Design from xilinx.com
Footnote on page 19
Referred to as "Added footnote with definition of electrical inch to 0805 Ceramic Capacitor" in revision history (version 1.6).
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
$endgroup$
An electrical inch is the actual distance along an electrical path.
Source: UltraScale Architecture
PCB Design from xilinx.com
Footnote on page 19
Referred to as "Added footnote with definition of electrical inch to 0805 Ceramic Capacitor" in revision history (version 1.6).
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
edited 7 hours ago
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
answered 8 hours ago
HuismanHuisman
5,6892 gold badges6 silver badges30 bronze badges
5,6892 gold badges6 silver badges30 bronze badges
add a comment
|
add a comment
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3
$begingroup$
I would think the wires/traces length
$endgroup$
– Eugene Sh.
8 hours ago
3
$begingroup$
I had to suspect inches honoring bends in your tracks. Not just a radius.
$endgroup$
– Janka
8 hours ago
$begingroup$
I wonder if this wire distance needs to be reduced according to the dielectric velocity factor?
$endgroup$
– hotpaw2
6 hours ago