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Recent content by steve.hunch

  1. S

    Altera QDR2,DDR2 using with out OCT

    Hi I am using Altera qdr2 and ddr2 controllers but I don't have enough pins to place RUP,RDN how can I by-pass this problem? Thank!
  2. S

    msp430 cycle time problem

    Thank you!
  3. S

    msp430 cycle time problem

    I did this, but apparently each each of those instructions disassembles to one assembler instruction. This means that I should get, at least for logical '0' approximate 1usec time (with 1MHz system clock). But I still get 10usec. There is some factor of 10 in instruction execution...
  4. S

    msp430 cycle time problem

    Hi , I use eval board "LaunchPad" I set CLK to 1MHz. When I try to check the maximum on-off rate on one of the pins I get 10usec - 100KHz. Doing just: while(1) { P1OUT = 0; P1OUT = 0xff; } The problem is that system clock is 1MHz, but this code gives my only 100kHz. What can be a problem...
  5. S

    how to Bias 20 amplifier

    Can you please give a schematic for at least one amplifier. I cant understand a thing that you wrote here :(
  6. S

    MSP430 16 bit ADC problem - what is the maximum sampling rate?

    Hi, I have very primitive question. I cannot find what is the maximum sample rate for MSP430F2003 **broken link removed** This is microcontroller from TI. Please , help me with this. Thank you.
  7. S

    I have some problems related with OP-AMP

    Can you show your circuit?
  8. S

    how to communicate a 16 bit ADC chip with PIC 16F877A

    If it uses SPI, just write a code for SPI communication, or used library functions.
  9. S

    need sugession for project (labview to fpga)

    Can you provide more information... What hardware do you have, what communication is available. Do you have DAQ modules?
  10. S

    Opamp testing/verification

    Open Loop gain, phase margin, slew rate, noise...
  11. S

    operational amplifier resistor selection

    Actually it will depend on your application. For example bias currents: if Ib=10uA so you cannot put 1M resistors. Also input capacitance, it will form LPF with resistor and slow down signal. Noise. Current feedback Opamps have specific resistance in order of hundreds of ohms that you can put in...
  12. S

    Smoothing a Square wave

    Put a comparator with referense on the middle (or double not gate)... Use open collector devices in order to set your maximum voltage.
  13. S

    Design of current sink or source

    There is a link to Analog Lecture notes sites **broken link removed** (it was posted several days ago), you can find it there. Also you can use datasheet of REF200 part.
  14. S

    Strange OA problems -

    It might be because of the input capacitance of the OpAmp, but oscillation frequency is to low for this. It also can be because of the OA self transfer function. Try to put a resistor in series to the OA output (before feedback closure).
  15. S

    AC Analysis of single opamp differential amplifier Pspice simulation

    The transient in the waveform is around BW cutoff of the circuit. Can you elaborate more, what exactly are you showing? Is is written there "N differential..?"
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