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Recent content by mina_a

  1. M

    high supply voltage amplifer made by low and high voltage mosfet?

    i used 0.18 um ams high voltage i have this problem SOAC: break V(B,SUB)is it important problem?
  2. M

    SIM900 start up problem

    thanks for your reply. so can i do this level translation by a resistive voltage divider? now I have checked the circuit and found that NRESET pin have zero voltage all the time, although i cut the connection of NRESET pin to microcontroller. and STATUS and NET pins also have zero voltage. So...
  3. M

    SIM900 start up problem

    hello. I am working with SIM900 module. the schematic of my circuit is here I turn on SIM900 by applying a low level voltage to the PWRKEY pin. after that, the STATUS pin doesn't go high and the NET pin is always off. and also SIM900 draws about 120 mA current, that is not normal. In my...
  4. M

    interfacing SIM900 with stm32 via USART

    hi friends; I want to interface SIM900 module with stm32 micro controller using USART interface. Is it possible to connect rx and tx pins directly, or should i use a voltage level converter circuit? thanks for your help.
  5. M

    DAC interface clock cannot be enabled in stm32

    Hi everyone. I'm trying to test DAC in stm32f103rbt6. I've written a simple program that writes a 12-bit value in DAC_DHR12R1 register. I set the "DACEN" bit in the "RCC_APB1ENR" register to enable DAC interface clock, but when i debugged the program and saw the RCC registers, i found that DAC...
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