Unanswered Questions
23,841 questions with no upvoted or accepted answers
Score of 12
0 answers
988 views
x86 Motherboard Bring Up - Intel Tiger Lake UP3 CPU
For those who has experience with Intel x86 motherboard design and bring up.
I'm in the middle of motherboard bring-up that has Intel Tiger Lake UP3 CPU.
Seems like I had a good run so far at power-up ...
CommunityBot
- reputation score 1
Score of 10
0 answers
335 views
Why does output of this reverse bias noise source not have normal distribution?
I am trying to build a noise source based on reverse biased PN junction (as I am trying to replicate this project https://altusmetrum.org/ChaosKey/ ). At this point, I tried multiple iterations but so ...
- reputation score 1
Score of 9
0 answers
1999 views
IIP2 Second Order Intercept Rule of Thumb
I'm faced with the problem of explaining the harmonic production in a system where the second order intercept points of the cascaded components are unknown. As a way to bolster my explanation, I would ...
CommunityBot
- reputation score 1
Score of 8
1 answer
1889 views
Ethernet magnetics, discrete vs integrated: inductance value
I recently made a change to an EtherCAT-over-Ethernet design, where I moved from using an RJ45 with integrated magnetics to a low-profile connector with discrete magnetics because of size constraints.
...
CommunityBot
- reputation score 1
Score of 7
0 answers
156 views
3-Level Flying Capacitor Instability
I am designing a 3-Level FC Converter.
Architecture:
From TI 3-Level Buck
Here is a rendering of the power stage, with the relevant commutation loops highlighted:
During operation in specific duty ...
- reputation score 93842
Score of 7
0 answers
342 views
Extremely long net in Xilinx synthesized design labeled "async_path". What's it for?
I used Vivado to synthesize a small design for the Xilinx xc7k-160t-1. The design includes a fifo instantiated with Vivado's XPM macros which crosses clock domains from 100.8MHz to 200MHz.
When I ...
- reputation score 1467
Score of 7
0 answers
326 views
Frequency locking for averaging resampling
Background
I've done a long one-shot measurement of a periodic signal by an oscilloscope. Thus, I've captured around 250 periods of a signal. The signal itself is a pseudo-random binary sequence at ...
- reputation score 711
Score of 7
1 answer
335 views
How does this delay line travel faster than light?
Board design:
Fab: 1.6mm thick substrate, εr ~ 4.8, seems to be normal FR-4 stock. (I actually measure more like ~5.3, but I don't have very good mechanical tolerances in the measurement, and it's ...
- reputation score 11416
Score of 7
1 answer
6139 views
Run IAR Program without Debugging
I'm having a simple problem with IAR Embedded Workbench, programming an STM32 using an ST-LINK/V2 programmer. I'm trying to run a program that temporarily switches off the JTAG pins, so I can't run it ...
- reputation score 1654
Score of 7
1 answer
702 views
Charge mode piezoelectric signal conditioning
I have a charge-mode piezoelectric dynamic pressure sensor (datasheet link) that I want to read a signal from. If you look at the datasheet it says the sensor outputs are in a balanced and floating ...
- reputation score 54
Score of 6
0 answers
909 views
How to match an edge launch SMA connector to a pcb with coplanar waveguide with ground?
I'm trying to develop a pcb that is capable of handling signals over 6GHz and created a test board to see how the pcb and connectors perform. The pcb is a relatively low-cost 4-layer FR-4 TG155 board ...
- reputation score 21
Score of 6
0 answers
242 views
Any way to have MSP430 wake from sleep and immediately start executing the next instruction after the sleep, avoiding calling into the ISR?
I am executing a simple state machine that steps based on a pin change and sleeps between steps. A significant amount of time is spent in the overhead overhead of calling the ISR on each pin change, ...
- reputation score 10521
Score of 6
0 answers
2671 views
STM32 - I²C Slave HAL Callback ACK
Objective: implement a single byte I²C slave on STM32.
Materials: STM32L452RE Nucleo-64 board, HAL Library, CH341 USB-I²C adapter(1), Artix Linux with Runit, Rhode & Schwarz RTB2004 oscilloscope
...
- reputation score 1
Score of 6
1 answer
371 views
Cannot find what causes faults on DRV8353RH
I keep getting faults on a a new batch of ESC boards based on the TI DRV8353RH & Infineon IPT020N10N3ATMA1. Please consider:
When starting a motor at 48V - 56V the DRV asserts a fault after ...
CommunityBot
- reputation score 1
Score of 6
0 answers
478 views
Detection of CT secondary subsidence current
In utility power system protection we have a protection function called "breaker failure" protection. This protection is used to take appropriate action if/when a circuit breaker fails to ...
- reputation score 3755