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Type: Posts; User: mahdiiust

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  1. Replies
    2
    Views
    237

    Closed: Re: transformer power supply design

    Dear smijesh

    Thank you for your reply.
    I tested the reader with a battery and it worked perfectly. So I'm approximately sure that it's a supply problem.
  2. Replies
    2
    Views
    237

    Closed: transformer power supply design

    Hi,

    I use an RFID reader for reading FDX tags. It utilizes ASK modulation so I designed a transformer power supply with LDO linear regulator but somewhere it doesn't work good and read range...
  3. Replies
    0
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    710

    Closed: Long range RFID by EM4095

    Hi,

    I am trying to design a long range RFID reader using EM4095. I designed my circuit by using EM4095 booster circuit document.
    As stated in this document, there are two ways to increase read...
  4. Closed: which inductor and capacitor can i use in LNA layout

    Hi
    I want to post simulate a LNA circuit in virtuoso including a 600 pH degeneration inductor and two 100 pF capacitors. My technology file is TSMC18rf and I use spiral_s2_std and pmoscap available...
  5. Replies
    5
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    1,015

    Closed: Re: 5 V 1.2 A SMPS with TNY255

    Thank you for reply!
    I use data of this product :...
  6. Replies
    5
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    1,015

    Closed: 5 V 1.2 A SMPS with TNY255

    Hi
    I’m trying to design a 5V/1.2A (6W) switching mode power supply using TNY 255. The schematic is below. I use EE19 core with Np= 273 turns, Ns=15 turns Lg=245 micron and Lp=6mH . But it doesn’t...
  7. Closed: Re: variation in reading voltage by atmega8 adc

    Thanks
    In fact I design a circuit for measuring the temperature and if the temperature is hotter or colder than a defined point, the relay will be on. but after the relay work the temperature...
  8. Closed: Re: variation in reading voltage by atmega8 adc

    thanks!
    yes I did not draw Atmega8 because I think the problem is related to power supply.
    So should I modify my PCB and try again?
    what is hysteresis?
  9. Closed: Re: variation in reading voltage by atmega8 adc

    http://obrazki.elektroda.pl/5663618700_1446654923.png
  10. Closed: variation in reading voltage by atmega8 adc

    Hi
    I designed a circuit with atmega8 for measuring a voltage and then if over voltage is occured a 12V relay will be on. but when the relay is on, the measured voltage reduced. I use LM326-2.5 as...
  11. Replies
    2
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    2,157

    Closed: thermometer with pt100 and atmega8

    Hi
    I want to build a thermometer using pt100 and atmega8 microcontroller. First I build a 1mA current source using op07cp and connect it to pt100. Then I read the voltage of pt100 using atmega8 ADC...
  12. Replies
    6
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    932

    Closed: 20kv capacitive voltmeter

    Hi
    I will build a high voltage (20kV) voltmeter using an ordinary 220V voltmeter series with a 20pF capacitor. My 220V voltmeter is calibrated and works good. So I must only change it’s calibration...
  13. Replies
    7
    Views
    997

    Closed: Re: How to use nmosdnw transistor in layout

    This is DRC error.
    113799
  14. Replies
    7
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    997

    Closed: Re: How to use nmosdnw transistor in layout

    Thank you very much!
    It works!
    but how can I draw n-well ring? I use M1_NWELL contact. but it has several DRC error.113772
  15. Replies
    7
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    997

    Closed: Re: How to use nmosdnw transistor in layout

    thank you for your answer!
    but I can't realize what you mean.113746113747113748
    for example I change my schematic and layout as figures below.
    but it's LVS failed!
  16. Replies
    7
    Views
    997

    Closed: How to use nmosdnw transistor in layout

    Hi
    I must connect source and body terminals of all transistor to each other to obtain proper result in hspice.
    but when i draw the layout i encountered a problem.
    for pmos transistor it's ok...
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