Mortensen
Looking for a full time job
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New DRAM access technology doubled overclocking performance
Mortensen 01/27/2018 -
Separate Ground Connection and Layout Power Components
Mortensen 05/25/2016 4.5 4.5/5 (2 ) -
[Tool] PCB Via Capacitance and Inductance
Mortensen 08/01/2016 4.6 4.6/5 (5 ) -
A DDR3 PCB Design Case Study
Mortensen 04/15/2016
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Some PCB EMI Guidelines Learned out of My Previous Projects
Mortensen 04/07/2016 5 5/5 (1 )
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Mortensen posted a new activity comment 1 year, 10 months ago · , 0, 0
Are we sure foldable is the next big thing? There is already suspect it doesn’t improve user experience much. If it doesn’t take off while erodes efforts of other features, maybe Apple is doing the right thing?
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Mortensen posted a new activity comment 2 years ago · , 0, 0
Motorola comes back with a foldable smartphone
https://techcrunch.com/2019/01/16/the-motorola-razr-could-return-as-a-1500-foldable-smartphone/
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Mortensen commented on the post, Some PCB EMI Guidelines Learned out of My Previous Projects 4 years, 7 months ago · , 0, 0
Hollis, I don’t think it is necessary to have metal along the edge of board. If you do, you may want to make sure it doesn’t form a loop otherwise there could be EMI issue.
Mortensen posted in
ASIC and FPGA 3 years ago · , 0, 1
#IO curve tracing
When we suspect if a io pad is broken, io curve tracing can help. Apply dc voltage to pad and ground and check current. VI current should be as shown for a normal pad. The rapid increasing currents at both pos and neg voltages are due to io #esd…[Read more]
Mortensen posted in
PCB and Board Design 3 years ago · , 0, 0
#Crystal osc circuit chip internal drive strength adjust
A typical #xtal osc is shown. Two caps and xtal are external to chip. The op amp is inside chip. To board designers, that op amp driving strength is not fixed. They normally have higher driving strength at bootup to make sure xtal…[Read more]
Mortensen posted an update 4 years, 5 months ago · , 1, 2
Which of trace A and B has more critical EMI issue?
Maybe it is straightforward for a seasoned EMI engineer. This interesting article uses Nimbic nWave to simulate the EMI issue and shows B is more…[Read more]
Mortensen posted an update 4 years, 5 months ago · , 1, 2
Use EMI scanner to see EMI emission and show the effect of decoupling capacitor
EMI scanner is a powerful and easy-to-use tool to deal with EMI…[Read more]