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Recent content by Astrid

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    MOSFET for Synchronous Buck Controller 20V 20A 600kHz?

    I design Synchronous Buck Controller with tps40304 switching frequency 600kHz. TI software proposed use on high side 2x CSD16323Q3 low side 2x CSD18503Q5A This MOSFET have Ultra-Low Qg and Qgd unfortunately Continuous Drain Current only 15 20A and therefore is nedd use 2pcs. I am trying to find...
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    New version Jlink v10.1?

    Segger said the new version Jlink v10.1 I'm interested in what is after the hw different from v9. Do you have someone new version of Jink v10?
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    High precise AC amplifier/attenuator with digital tuning

    I need precise AC amplifier for measure AC voltage in input voltage range 10mV-750V frequency 3Hz - 1MHz. The 1st stage is a compensated attenuator implementing a gain of x0.2 or x0.002 The second stage is made up of two amplifiers each configured for a fixed gain of x10. For calibration and...
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    Resistor thermal noise

    My question is simple. Calculates the thermal noise of the resistor R9 to the overall noise amplifier? If yes, how else to prevent oscillation second amplifier when theis not used?
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    ADC sampling and signal reconstruction

    Hello I have any question about signal sampling theory. I have signal generated from DDS (10bit with good reconstruction filter) , signal is sinus of known frequency 100 kHz. I need to know as precisely as possible amplitude and time zero crossing I have 12bit ADC with 5 MSPS (STM32F303). i.e...
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    N-MOSFET drain to source leakage current?

    Yes, heater with series N-thermocouple is commercially produced thing. Preferably only two-pole connection. The question is how drain to source leakage current depends on D-S voltage. Infineon 60V IPP100N08N3G and 100V transistor IPP086N10N3G have 1uA for T25C and 10uA for T120C for DS Voltave...
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    N-MOSFET drain to source leakage current?

    I have 8ohm heating element in series with N Type thermocouple. This is powered +30V over N-Mosfet transistor on high side. Why high side, because thermocouple voltage is measured when heating element not powered. Zero gate voltage leakage drain current make on 8ohm any error voltage. For...
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    Power and data transfer over RF coaxial?

    Thank you for your answer, especially Jirkovi. Separate GHz on mW of power is certainly less of a problem than separate MHz hundreds of Watts. The second problem is the my load has a small DC coupling, too. But we do not resolve it now. Do you know of example? One thing is the design of the...
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    How to improve TL-431?

    Hello, I need add to my design DAC and Voltage Ref. unfortunately, the price limit says it has no money and and therefore I have to use low cost components. As Vref any as TL431. Unfortunately, slightly larger temperature drift and noise than I imagined. Temperature drift is problem, bud partly...
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    Power and data transfer over RF coaxial?

    Multicore coaxial unfortunately does not apply to power supply must be only 1pc N connector. Yes low w impedance is one of the potential problems. Unfortunately, there is no simple solution around.
  11. A

    Power and data transfer over RF coaxial?

    I have coaxial line through which is transferred 200W (50V) sinus on 10MHz, length between power to load 3m. I need after this coaxial cable to transmit data and power the processor. Power approximately 100mW for MCU Data transfer, bidirectional, speed 2400 bps Something like Power LNB and...
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    Silver mica or NPO SMD capacitor for output network in Cass F amplifier where buy?

    Through hole Silver Mica buy for 0,5$/pcs, but I need SMD. I tried to compare characteristics of SM and NPO 100pF Q, Z, ESR 100pF 500V Silver Mica is Red 100pF 200V NPO 500V Samsung CL31C101JGFNNN is green TC is +-25ppc/C SM, +-30ppc/C for NPO Tolerance +-5% both. Unfortunately I can not say...
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    Silver mica or NPO SMD capacitor for output network in Cass F amplifier where buy?

    I make copy of RF (15MHz) 150W class F amplifier. with fifth order output network. In original output network is about 15pcs SMD 1210 Silver Mica capacitors 150 pF or less, all for voltage min 200V. I was looking at the availability and cost of 1210 Silver Mica and found only this 2.56 euros for...
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    Where to buy MPP toroid core or can be replaced Sendust core ?

    I need toroid OD096 Al 53nH/N^2 Perm 125u, for example CM96125, 55280-A2, A-250053-8, C055280A2. Datasheet At worst, I take the size of CM-097125. I can not find anyone who would sell me a few tens piece at a reasonable cost and with acceptable postage. Second question. Core is used as current...
  15. A

    ESD OV, protection I/I pin STM32F1xx?

    How to protect inputs and outputs processor to which they are attached HALL, IR and other digital sensors? Example. HALL A3144 on 2m cable, powered +5V. My first choice is 1k resistor, but does not solve ESD protection, Second choice is use integrated circuits as...
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