Unanswered Questions

14
votes
0answers
893 views

Signal Flow Graph for electrical circuits

I am a student and my question is about finding the signal flow graph for a simple circuit. I found the above formula for a \$k\$ node having \$U_k\$ potential. In the book it is said that this is ...
6
votes
1answer
269 views

RTOS for Cortex M4 with 802.15.4/6LoWPAN stack

I'm evaluating operating systems to use in an Internet of Things Project and I don't know what's the best way to proceed. I'm using a TM4C123GH6PM MCU with 32k RAM and a CC2520 802.15.4 transceiver, ...
6
votes
1answer
252 views

Unable to read file greater than 2K in FatFS

I am reading a file from the SPI Flash with FATFS file system, on STM32F103 platform running FreeRTOS. I can successfully read File of size less the 2048, but if read a file file of size greater than ...
5
votes
0answers
66 views

Yields in DRAM and other Massively Redundant Processes

I'm right now combing the electrical engineering literature on the sorts of strategies employed to reliably produce highly complex but also extremely fragile systems such as DRAM, where you have an ...
5
votes
0answers
403 views

Trifilar Transformer Common-Mode Rejection Circuit (Signal Recovery, Hybrid Combiner, RF)

I'm trying to develop a circuit that allows me to effectively subtract two different sources of RF noise from a single signal at the same time. I am planning to use something called a "trifilar" ...
5
votes
5answers
584 views

Miniature wireless distance sensor

I am novice in electronics, so please bear with me. I am searching for a small distance sensor (as small as possible) that I can use to measure a distance between 0 and 30 cm precisely (precision ...
5
votes
5answers
323 views

Determining Capacitor Discharge Rate

First time poster, apologize if I accidentally missed any rules. I've built a circuit that keeps a relay closed that is attached to battery power for a specific amount of time so my Raspberry Pi has ...
5
votes
1answer
231 views

Implementation of AES algorithm using Systolic architecture

I need to generate a VLSI Systolic array to implement the AES encryption algorithm with key length of 128 bits. Following are the possible ways : Systolic for Key expansion Systolic in MixColumn ...
4
votes
2answers
314 views

How to implement critical sections on ARM Cortex A9

I am porting some legacy code from an ARM926 core to CortexA9. This code is baremetal and does not include an OS or standard libraries, all custom. I am having a failure that appears to be related ...
4
votes
2answers
211 views

PCB layout for high side switch (high current)

I'm working on a PCB layout for two high side switches. You can see below a picture of my current layout. The copper weight of the future PCB will probably be 2 oz/ft² (double sided). I use two ...
4
votes
1answer
104 views

How to display a custom parameter value in the PCB footprint of my Altium component?

Suppose my component has a string-valued parameter named "Label". I'd like the PCB footprint for this component to automatically display whatever value was set for this parameter in the schematic ...
4
votes
2answers
256 views

Widlar current source

I need help solving this problem. I believe the current in the left side of the circuit equals the current in the right side. Therefore, $$K(V_{gs1} - V_t)^2 = 4K(V_{gs2} - V_t)^2$$ I also know ...
4
votes
2answers
247 views

Explanation of performance graph of FPGA design

After implementing a mathematical function on a FPGA chip. The following graph shows for ~40 inputs the time response, i.e. how long it took to get the output calculated. This data is part of the ...
4
votes
0answers
159 views

Typical zero sequence data for 80MVA transformer

I need to model a 80MVA transformer 132/33kV built in 1973. There is very little information on this transformer but I need to populate certain values in the model. Where can I find typical zero ...
4
votes
1answer
248 views

Lithium battery consuming more power on Sleep Mode

I am trying to reduce the power consumption for PIC18F87J11 on sleep mode. The PIC is drawing about .01 mA (6 uA) on sleep mode with Alkaline AAA batteries and other power source, but when I use ...

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