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Recent content by Avla 0652

  1. A

    Voltage reference for 24bit ADC?

    First of all, 24 bit = it is not an accuracy, 24 bit is a resolution of the ADC. the accuracy of a high precision ADC usually is much worse than resolution. And moreover, the accuracy of Vref usually is much worse than accuracy of ADC. Many high-precision ADCs are supposed to be used in...
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    how to design wide bandwidth of LPF in PLL design

    One of the possible ways is to visit www.analog.com they have a lot of different PLL ICs and proper design tools, pretty simple in use. AFAIK for fast switching PLL, the Fractional-N PLLs are preferable. However there is a tradeoff: Fractional-N PLLs generate worse signal, not so clean as...
  3. A

    Low RPM wind power generator

    Try to use stepper motor, they are multi pole and they work as a generator at low rotating speed.
  4. A

    Defining current limiting resistor for Moc3063

    What is the source of these repetitive surges you talk about? And could you show your circuit diagram?
  5. A

    high Q bandpass filter design

    Maybe you should try "switched capacitor filter", like LTC1059 for example but they need clock signal.
  6. A

    Why do we usually use IF(Intermediate frequency) ?

    abs is quite right. If you use IF, you can build one constant frequency high-Q IF filter, if you want to use direct conversion, you should design variable frequency high-Q filter, it supposed to be much more complicated design.
  7. A

    [SOLVED] need clarification about adxl335

    If the sensor is in zero acceleration position, it produces about 1.5 V, so Xout = 1.447v and Yout = 1.525v are OK. > <i>i know if an object is not moving it acceleration is 0 m/s²</i> It is true concerning horizontal axis, but vertical axis sensor is affected by gravity, i.e. 1g. Sensitivity...
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    Dual rail +/-6V supply for 3x CLC406 opamps

    There are "SWITCHED CAPACITOR VOLTAGE CONVERTERS" for example ADM660/ADM8660,ADM8828/ADM8829 I hope it helps.
  9. A

    [SOLVED] OPAMP single supply operation

    Also LM158/LM258/LM358 are very popular, but you should narrow your question.
  10. A

    How to maintain constant current across a 4-wire RTD?

    fyi, many of modern converters allow "ratiometric" connection, i.e. they can use RTD excitation current as a reference, so it is not necessary to maintain a constant current across an RTD or constant voltage. for example, AD7781 can work in ratiometric mode: In this circuit, the voltage across...
  11. A

    measuring current using instrumentation amplifier

    These are lots of inamps able to handle common-mode voltage much higher than VDD, for example AD628 can withstand ±120 V at VSupply = ±15 V.
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    [SOLVED] AD620 RTD Bridge Circuit Help

    BradtheRad No, RTD-PT100 means that it is 100 Ohm, '25.00' probably means 25 degrees C
  13. A

    [SOLVED] AD620 RTD Bridge Circuit Help

    zeb59, sorry, I meant that with +/-9V you still have 8.57 V at the inputs (9V / (2k + 100)) *2k = 8.5714 V It is still too close to V+ rail.
  14. A

    [SOLVED] AD620 RTD Bridge Circuit Help

    zeb59, in your circuit the voltage at the AD620 inputs is too high, about +4.76V, it is out of the normal common-mode range. Input common mode voltage should be less than +VS−1.4 according to the datasheet, i.e. less than 3.6V (in case of +5/-5V supply). Try to make R5 and R6 lower, and connect...
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    Why ΣΔ converters have idle tones

    Sorry, could you throw some light, > "idle tones" what do you mean?
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