FvM
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Yesterday, 17:10The source of voltage transients upsetting the microcontroller is arcing at the 230 V relays contacts. A first step could be connecting MOV voltage...10 replies | 164 view(s) -
Yesterday, 16:48Doesn't change much, Q1 Cbe is already working as a low pass.24 replies | 450 view(s)
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Yesterday, 16:44Strange JFET datasheet, they have merged a few lines of a MOSFET specification to the header, need to ignore it. 2N4117 used in the Burr-Brown...3 replies | 115 view(s)
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Yesterday, 16:27Phase margin is a parameter of the feedback system achieved with a specific feedback factor, not a generic OP parameter. You'll use unity gain...7 replies | 184 view(s)
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Yesterday, 13:25dpaul replied to a thread What does design for test engineer in VLSI do? How is the job? in ASIC Design Methodologies and Tools (Digital)Use a search engine for details - "Dft flow" https://www.evaluationengineering.com/using-dft-in-asics1 replies | 65 view(s) -
Yesterday, 13:21Have you simulated your complete design (I2C master is there and a slave model exists) using the exact clocks? If not first focus there! Connect...6 replies | 115 view(s)
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Yesterday, 12:44Need a series resistor (e.g. 50 to 100 ohm) to limit the uC port current within maximum ratings.4 replies | 89 view(s)
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Yesterday, 11:50Which signal are you feeding to the 4046 PLL? I don't think that the phase/frequency detector is suited for clock recovery from HDB3 coded signal.2 replies | 55 view(s)
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Yesterday, 08:28dpaul replied to a thread Amba ahb slave interface for external memory control(rom,sram) in ASIC Design Methodologies and Tools (Digital)Read the AHB spec carefully. Re-read the spec if things are not understable the first time. That is driven by the slave state machine. There...1 replies | 81 view(s)
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15th October 2018, 18:41In many cases, pA input stages won't use other protection elements than the IC substrate/protection diodes, rated for 5 or 10 mA continuous and much...3 replies | 115 view(s)
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15th October 2018, 18:25- There's no page 680 in the linked datasheet, you apparently mean pg. 670 - 28 or 44 pin is already coded in the device type, 18x5x is 28 pin,...1 replies | 79 view(s)
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15th October 2018, 17:37Phase margin has to be determined for the actual OP configuration whatever if is.7 replies | 184 view(s)
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15th October 2018, 14:08FvM replied to a thread How to choose a suitable sampling frequency for this current sensor? in Power ElectronicsI would proceed as follows: - configure the low-pass filter so that pwm pulses are sufficiently averaged, e.g. 1 kHz or below - choose a sampling...10 replies | 244 view(s)
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15th October 2018, 13:51The 75 ohm resistors are for common mode termination purpose. They have nothing to do with differential 100 ohm termination required at the...1 replies | 63 view(s)
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15th October 2018, 10:32FvM replied to a thread obtaining 1206 chip resistor voltage rating in Elementary Electronic QuestionsVoltage rating is partly dependent on resistor technology, not only package dielectric strength. That's one reason why you see so many different...9 replies | 298 view(s)
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14th October 2018, 22:33FvM replied to a thread How to choose a suitable sampling frequency for this current sensor? in Power ElectronicsThat's what I expected. It's a buck converter with the motor inductance used as storage inductor. IGBT and D5 current are pulsed, motor current is...10 replies | 244 view(s)
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14th October 2018, 22:25If you find the Wikipedia phase margin article hard to read, why don't you refer to a better understandable explanation? Unity gain frequency and...7 replies | 184 view(s)
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14th October 2018, 21:47FvM replied to a thread How to choose a suitable sampling frequency for this current sensor? in Power ElectronicsThe circuit topology isn't completely clear, I presume it's some kind of buck converter. If you want the motor current, you'll measure the motor...10 replies | 244 view(s)
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14th October 2018, 17:03FvM replied to a thread How to choose a suitable sampling frequency for this current sensor? in Power ElectronicsThe question is partly unclear without knowing the current waveform. Measuring the switch current of a 10 kHz pwm system with 18 kHz bandwidth sounds...10 replies | 244 view(s)
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14th October 2018, 16:51You won't ask the question if you had reviewed the TDK B32774 datasheet before. The simple point is that there no small DC link capacitors between...7 replies | 215 view(s)
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14th October 2018, 16:44Doesn't work for several reasons, at least these: - LM393 output is open collector an can't source voltage - comparator threshold of 0V makes no...6 replies | 184 view(s)
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13th October 2018, 23:05Post #10 shows a useful unipolar (three-level) scheme, although the assignment of high and low side signals is partly confused. The schematic in post...13 replies | 389 view(s)
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13th October 2018, 17:19FvM replied to a thread Interfacing STM32F429 (FMC) with a 1 GB Parallel NOR Flash (M29EWL) in MicrocontrollersThere are in production types from Micron or Cypress, e.g. MT28FW02. But apparently no 2 GB is presently on stock. Check yourself in catalog...13 replies | 384 view(s)
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13th October 2018, 17:05You didn't show the used PWM pattern. Can you sketch it or show the respective Proteus waveforms and explain why you selected it this way, e.g. with...13 replies | 389 view(s)
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13th October 2018, 15:51The software needs to fit your development board. There are so many working solutions, each using a different programmer hardware. - - - Updated -...9 replies | 294 view(s)
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13th October 2018, 15:37FvM replied to a thread Interfacing STM32F429 (FMC) with a 1 GB Parallel NOR Flash (M29EWL) in MicrocontrollersThe only functional difference between A26 select line and the other address lines is in its internal usage, in a behavioural view, they have...13 replies | 384 view(s)
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13th October 2018, 14:21Don't know what the MATLAB options for discrete integrator are, but a discrete integrator is generally implemented as accumulator with feedback, y(n)...3 replies | 100 view(s)
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13th October 2018, 14:13According to the schematic and oscilloscope settings, the yellow waveform is showing the difference between both bridge outputs. You would expect a...13 replies | 389 view(s)
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13th October 2018, 10:46Problem is probably an inappropriate PWM pattern. Seems like you are switching either B or D on and off. This pattern can only work for a purely...13 replies | 389 view(s)
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13th October 2018, 10:27FvM replied to a thread Need help on single stub matching problem. in RF, Microwave, Antennas and OpticsNot sure which design procedure you refer to. λ/8 stub corresponds to 90° rotation in Smith chart (|Xc| = ZL), range to mimic a capacitive reactance...4 replies | 273 view(s)
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