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Type: Posts; User: FvM

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  1. Replies
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    Closed: Re: transfer function of sc amplifier

    May be mathematically correct, but wrong in Z transform context.
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    Closed: Re: Bias current sensor for floating earth

    Don't think so. U1 LED is driven with wrong polarity and has negative transistor supply.

    157827

    Many previously mentioned problems are still present, ignoring balanced ground fault, huge...
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    Closed: Re: how to generate 4MHz clock from 2 MHz clock.

    A bit more complex. You'll design a kind of software PLL with 2 and 4 MHz output, locked to the 2 MHz reference. Dynamic phase shift might be used if the phase jitter requirements are very strict....
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    Closed: Re: Non-Invasive High Voltage Coupling?

    High Voltage Coupling means what, exactly? Measuring current, voltage, linearly, which range? HCPL-0370 reference suggest you want to compare current magnitude with a threshold, if so, what's the...
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    Closed: Re: 72 pin SIMM pinout and circuit

    If you experience contradicting hearsay specs, why not refer to major manufacturers datasheets instead?
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    Closed: Re: how to boost microvolts to higher voltages?

    I believe, you either don't read the answers or don't understand it. I have no other explanation for seeing the circuit in post #45 that has been already recognized as non-working. If you want to...
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    Closed: Re: Impedance calculation in CMOS circuit

    Incomplete problem description results in ambiguous or useless answer. At least one unclear point is floating substrate nodes.

    Transconductance is a small signal quantity, respectively it's valid...
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    Closed: Re: transfer function of sc amplifier

    1/2 sample period is no meaningful quantity in sampled data system. Output is only observed at integer multiples of sampling period. You'll see if you cascade two of the shown stages. What's the...
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    Closed: Re: Bias current sensor for floating earth

    A symmetrical fault example, referring to your previous design. How would you detect it?

    157803

    - - - Updated - - -


    The file is different from posted schematic (incomplete). The new scheme...
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    Closed: Re: how to boost microvolts to higher voltages?

    I feel that some points should be sorted out.

    You have been originally asking how to amplify µV signal to mV, with minimal supply voltage.
    Later you switched to 1.45 V input voltage and 8V...
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    Closed: Re: Bias current sensor for floating earth

    The idea of an ungrounded network (IT network) is to avoid short circuit currents in case of a single ground fault while being able to detect the fault.

    The 10 k resistors in your circuit cause a...
  12. Closed: Re: RHP poles always appear in my designed amplifier

    A RHP pole in the open loop transfer function can be only generated if the feedforward turns into positive feedback, likely to happen for the post #1 circuit.

    How do you measure the transfer...
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    Closed: Re: Bias current sensor for floating earth

    Your monitor circuit is generating huge leakage currents and power dissipation and surely no acceptable IMD solution.

    What is your of insulation resistance threshold specification?

    - - -...
  14. Closed: Re: Waveform saving upon trigger in windows from Oscilloscope

    MSO2000B series has 1M data points memory, about 10 sec @ 100 kSPS. Timebase can be set up to 100 s/div, 1000 s total length with respective lower time resolution. Not sure if quasi continuous data...
  15. Closed: Re: Waveform saving upon trigger in windows from Oscilloscope

    The simple way to save the waveform is to set up acquisition parameters as required, make a measurement and save the waveform to USB drive in *.csv format. No software needed.

    It should be noted...
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    Closed: Re: Flyback Airgap Doubts?

    In case you want someone to check your transformer design, you should give complete information, e.g. which input voltage was used during the test. Also what's the designed primary peak current.
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    Closed: Re: Circuit to capture the motor inrush current

    Inrush current can be captured with a current probe and a digital oscilloscope.

    It's not clear what you exactly want to achieve and how the schematic is related to motor inrush current. ...
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    Closed: Re: how to generate 4MHz clock from 2 MHz clock.

    Possible solutions have been sketched, but the application requirements are yet unknown.
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    Closed: Re: Bias current sensor for floating earth

    IMD (insulation monitoring devices) are specified by IEC 61557 and available on the market. For unearthed (IT) power supplies, these devices are basically implementing the operation principle...
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    Closed: Re: how to generate 4MHz clock from 2 MHz clock.

    10 MHz minimal clock input frequency is common series 7 MMCM spec as far as I'm aware of.
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    Closed: Re: how to generate 4MHz clock from 2 MHz clock.

    If you have a higher frequency clock available, a digital PLL can generate the 4 MHz clock, however limited to the time resolution of the system clock. Ultimately, you can phase lock an auxiliary...
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    Closed: Re: how to boost microvolts to higher voltages?

    Having already multi mV range offset: surely not.
  23. Closed: Re: Gas flow meter + Gas pressure meter + Vacuum meter?

    2. There's no simple method to add a readout to float-type flowmeter (rotameter). Most economic flow meters (I doubt you find cheap sensors with suitable precision) have thermal or pressure drop...
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    Closed: Re: Interpretation of frequency of VCO

    Literally, a VCO is a VFC (voltage to frequency converter) and vice versa. Specifically the term VFC refers to converters with large frequency ratio (e.g. 0 to xx kHz) and high linearity. The...
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    Closed: Re: how to boost microvolts to higher voltages?

    Some key specs missing: Signal bandwidth, source impedance, acceptable noise level (specified as voltage density or wideband noise level, e.g. 0.1 to 10 Hz µVpp), acceptable offset voltage (if DC...
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