Activity for Nick Alexeev‭

Type	On...	Excerpt	Status	Date
Answer	—	A: Level shifting of a 3 state logic pin Another solution which uses an ADC to read the three-state pin on the battery charger IC. The original question mentions GPIO, and doesn’t mention ADC. Maybe this will be useful for some other design which has an ADC. diagram for a level shifter between MCP73831 and a microcontroller with an ADC... (more)	—	4 months ago
Answer	—	A: Noise from oscillator on top layer to clock on bottom layer with VCC & GND layers between What you are proposing may be okay (depending on other specifics of the design), but your proposed 4-layer PCB stack-up looks like a compromise. Clock is a high speed signal, and so is SPI depending on the edge raise time. Clock and SPI are on different layers: top and bottom. What acts as referen... (more)	—	5 months ago
Answer	—	A: What fabrication process is being used for jellybean parts [I used to work at Microchip.] > Is it [node size] at all important [for power management ICs] ? For power conversion ICs cutting edge MOSFETs on the scale of 5nm aren't important, because power MOSFETs are large. Larger scale MOSFETs (older generation processes) are cheaper than the cutting ... (more)	—	5 months ago
Answer	—	A: Essential safety features of an EMG/medical grade device? > What are the essential safety features of such types of hardware? > One option to make such hardware safer is to make it battery powered. What other safety features are generally recommended? The answer to these questions are in the IEC 60601 standard. If you are involved in electrical... (more)	—	9 months ago
Answer	—	A: Correct way to think about thermal noise? > If a data sheet gives the thermal noise (of +3/-3 standard deviations) as 1 uVpp does it mean that out of every thousand samples, 3 will have noise more than ±1 uV at any sample rate? 1000 sps will lead to 3 samples having more than ±1uV noise in a second, 2000 sps will lead to 6 samples having mo... (more)	—	9 months ago
Answer	—	A: MOSFET protection with TVS: at the source pin or at the drain pin If you put the Fat load-dump TVS downstream of the reverse-polarity protection MOSFET [^1], then the load dump current would have to flow through the MOSFET. The MOSFET would have to be rated for that current. If you put the Fat load-dump TVS upstream of the reverse-polarity protection MOSFET, th... (more)	—	12 months ago
Answer	—	A: How can I fix this 4-20 mA current loop to source current that matches current sink on its input? I'd rather use the AD4111 as a high-side current sensor, instead of creating an "inverter" which would generate an equal and opposite current. Each current input of the AD4111 (IINx+ and IINx-) is essentially a differential voltage input with a built-in 50 Ω resistor between them. It can work as ... (more)	—	about 1 year ago
Answer	—	A: Is ESD overhyped? ESD precautions can save a lot of tedious failure analysis. A very inconvenient thing about ESD is that a failure can be attributed to ESD only by ruling out every other possible cause. ESD failure is established by exclusion. One checks every other possible failure hypothesis, and none of them ... (more)	—	over 1 year ago
Answer	—	A: Low-pass filter after the output DAC in CD players [In addition to what Olin wrote earlier.] I looked-up one of the references from the textbook, and I may have found the answer which the author had in mind. > This entire spectrum must not be passed on to the player amplifier and loudspeaker. Even though the frequencies above 20 kHz are inau... (more)	—	over 1 year ago
Question	—	Low-pass filter after the output DAC in CD players [Disclaimer. This is not for an academic class. I'm self-studying.] I’m reading an introductory book on DSP for audio and computer music [Steiglitz 1996, ISBN 0-8053-1684-1 p. 287]. One of the sections discusses oversampled D/A conversion at the output of the CD players. The audio stream is ... (more)	—	over 1 year ago
Question	—	Altium. Reusing schematic symbols for pin-compatible parts. I want to create a schematic symbol and reuse it for multiple ICs which have identical pinouts. For example, OpaMPS, or the venerable SN74LS00, SN74HC00, SN74HCT00. How can I do this in an Altium library without copying and pasting the symbol every time? I'd like to create a library where I don'... (more)	—	almost 2 years ago
Answer	—	A: How to protect RF switches from ESD? > In this case the antenna connector is the standard horrible little U.FL, which is connected with coaxial to a bigger one grounded to chassis. The main ESD risk is when someone is connecting or removing the coax. It's quite easy to touch the center pin with ones fingers on a U.FL. from [this commen... (more)	—	about 2 years ago
Answer	—	A: Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"? > Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"? Rounding (down, or up, or to the nearest integer) is he mathematical process which discretizes value. Multiplication by the Ш-function (Dirac comb) discretizes time. > I always had trouble ... (more)	—	almost 3 years ago
Answer	—	A: ESD USB Shield Connection & Filtering A few months ago, I too was looking for answers on how to connect the USB shield with ESD in mind. I always connect the shield through a resistor to ground and a capacitor to ground (100kΩ and 0.01uF). Pulsing ESD into the shield is a part of the test. The ESD will appear across the capacitor,... (more)	—	over 3 years ago
Answer	—	A: Can I ask about debugging/fixing a broken product? Thanks for asking. Repair questions are off-topic, in general. We may consider a repair question, if you explain your specific troubleshooting steps, and you understand the design of the device. In practice, the second condition means that you should have a schematic. (more)	—	over 3 years ago
Answer	—	A: ESD Protection - Differential Amplifier [In addition to the answers which have already been posted.] A current sensing circuit like this lends itself to another scheme for ESD protection, which uses only one TVS. Only the line in which you're sensing the current is exposed to ESD. The small value current-sense resistor will keep the d... (more)	—	over 3 years ago
Answer	—	A: Are questions about electronics market trends on-topic? I think that the example question in the O.P. should be re-written as design for manufacturing question (DfM, or some other DfX). Electronics market trends questions should be off-topic. It would invite opinion-based speculation. (more)	—	over 3 years ago
Question	—	Why is the ACK (acknowledge bit) in the CAN bus frames dominant? What could have been the rationale behind that design decision? [I’m asking this question out of curiosity. I understand that this aspect of the CAN bus specification is what it is, and can not change.] The ACK bit in any CAN data frame is dominant. Each receiving node sets the ACK dominant when it receives a data frame, and doesn’t detect errors. Dominant ... (more)	—	over 3 years ago
Answer	—	A: Why are posts that users clearly approve of being closed? We have to maintain the focus of the Electrical Engineering board at the electrical engineering level. We will be inundated by laymen questions (electronics use, repair, explaining electronics to laymen), if we don't close such questions. The actual engineers (the people with answers) will stop spe... (more)	—	over 3 years ago
Answer	—	A: Why there is a body diode in mosfets? Diagram. Cross-section of a lateral N-channel MOSFET. Body diode shown. A MOSFET has its gate, source and drain on the top side [^1]. These structures are sitting on top of the substrate, which is also called body or bulk. The source and drain are n-doped, while the body is p-doped.[^2] There a... (more)	—	over 3 years ago