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Recent content by mahdiiust

  1. M

    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. M

    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 decreased. I think it's due to poor voltage quality because there are several motors , ... nearby. I...
  3. M

    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 range. First using a power stage to drive antenna with higher currents. Second using an envelope...
  4. M

    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 in TSMC18rf library. But both of them occupy big area in layout. Is my work true? And if not, what...
  5. M

    5 V 1.2 A SMPS with TNY255

    Thank you for reply! I use data of this product : https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwi72tTj8fvKAhVK2SwKHV8vD8AQFggcMAA&url=http%3A%2F%2Fwww.premiermag.com%2Fpdf%2Fpny-05015.pdf&usg=AFQjCNHPdZx7FU40_ueYmAbkg9cLRNIikg&bvm=bv.114195076,d.bGg -...
  6. M

    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 work properly. Some results are here : Load (ohm) Vo (V) I (mA) P (W) No load 5.48 -...
  7. M

    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 changes (increases). to determine the source of problem I measure some voltages. The sensor and...
  8. M

    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. M

    variation in reading voltage by atmega8 adc

    https://obrazki.elektroda.pl/5663618700_1446654923.png
  10. M

    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 reference voltage on Aref pin. what is the problem? Is it related to my PCB design? the schematic is...
  11. M

    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 and calculate the resistance. After that by some equations mentioned in pt100 datasheet the...
  12. M

    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 factor for 20 kV. Capacitor impedance is about 113MΩ at 50 Hz. So I calculate calibration factor...
  13. M

    How to use nmosdnw transistor in layout

    This is DRC error.
  14. M

    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.
  15. M

    How to use nmosdnw transistor in layout

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