Nick Alexeev‭

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 failu...

posted 3y ago by Nick Alexeev‭

This type of symbol isn't standard or common. Those are electrolytic capacitors. The short bar is the positive terminal.

posted 8mo ago by Nick Alexeev‭

The efficiency of the LDO is a function of the input and output voltages. $$\eta = \frac {P_{out}} {P_{in}} = \frac {I_{out} V_{out}} {I_{in} V_{in}}$$$I_{out} \approx I_{in}$ for a series linear ...

posted 1y ago by Nick Alexeev‭  ·  edited 1y ago by Nick Alexeev‭

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? ...

posted 2y ago by Nick Alexeev‭  ·  edited 2y ago by Nick Alexeev‭

[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 ...

4 answers  ·  posted 3y ago by Nick Alexeev‭  ·  last activity 2y ago by Lorenzo Donati‭

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 wi...

posted 2y ago by Nick Alexeev‭  ·  edited 2y ago by Lorenzo Donati‭

I have a hunch that the AC which flows through the isolation transformer has quite a bit higher frequency than 1 MHz. The first piece of evidence is this sentence in the datasheet. Each time a ...

posted 4mo ago by Nick Alexeev‭  ·  edited 4mo ago by Nick Alexeev‭

[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 powe...

posted 2y ago by Nick Alexeev‭  ·  edited 2y ago by Nick Alexeev‭

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...

1 answer  ·  posted 3y ago by Nick Alexeev‭  ·  edited 2y ago by Lorenzo Donati‭

I've got a is self-powered USB device, which means that I have to do VBUS detection. The device is built around STM32G474. Unlike some other STM32s, the STM32G4 don't have a dedicated pin for VBUS...

2 answers  ·  posted 1y ago by Nick Alexeev‭  ·  last activity 1y ago by Nick Alexeev‭

synopsis Achievable by using a rail-to-rail op-amp. A small bias on the non-inverting input improves the transient response of the op-amp. That’s the second circuit in the O.P. I use such top...

posted 1y ago by Nick Alexeev‭  ·  edited 1y ago by Nick Alexeev‭

If it is important, how crucial is it that the polygon completely overlaps the ground plane beneath it? A power polygon can hang off the side a of a power plane. Complete overlap isn't crucia...

posted 1y ago by Nick Alexeev‭  ·  edited 1y ago by Nick Alexeev‭

The sensed current may be at a +90V potential (VIN). The LTC2063 op-amp power supply range goes only to +5.25V . It's not a high voltage op-amp. So, the op-amp in this circuit floats just below ...

posted 9mo ago by Nick Alexeev‭  ·  edited 9mo ago by Nick Alexeev‭

[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 rece...

2 answers  ·  posted 5y ago by Nick Alexeev‭  ·  last activity 5y ago by Olin Lathrop‭

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...

posted 5y ago by Nick Alexeev‭  ·  edited 2y ago by Lorenzo Donati‭