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Recent content by power-twq

  1. P

    how to generate only one rectangular wave???

    you can use TLC555 timer cdircuit as a one shot. it's easy and powerful. best regards
  2. P

    I need an IC like 74HC244, but with |Iout|>20mA?

    74hc244 led if your power is 3.3V, you can sonsider using TI's 74LVC244, the speed is faster than 74HC244. best regards
  3. P

    What are the capabilities of step up converter?

    Re: step up converter Because a inductor's current can't change instantly. we can use this characteristic to output voltage high than input. best regards
  4. P

    difference between clkbuffer and delaybuffer ?

    CLK BUFFER is designed to have equal low to high and high to low delay, delay buffer may have unequal low to high and high to low delay. best regards
  5. P

    What it means when an opamp is described as being able to drive a load of 10nf?

    Re: Capacitor as load generally, a op can't drive very large capacitance, or its output will oscillate. if we say a op can drive 10nf load, it means this op can drive 10nf load without oscillation. best regards
  6. P

    Where to implement an AES encryption/decryption algorithm: in FPGA or in CPLD?

    Re: FPGA or CPLD? you should use FPGA, because general CPLD has lower logic capacity to meet your needs. best regards
  7. P

    What is a buffer in digital and analog circuits?

    Re: buffer problem a buffer is used for improving logic gate's drive ability or insert some delay in particular path. logic function is Y = A. it can't be used as a memory. best regards
  8. P

    what is hot-topic in digital design now?

    1) high performance. 2) small die size. 3) gals (global aynchronous and local synchronous) 4) low power 5) signal integrity best regards
  9. P

    How to design a programmable counter?

    perhaps you can use a prescaler to divide input GHZ signal, then the following counter can use a low speed programmable counter, that's not difficult. best regards
  10. P

    Why do we do time analysis prior to CTS and not Holdtime ?

    Re: Timing Analysis question beacuse setup timing issue can't be repaired during layout, and hold time may do not exist after layout, wireing delay can repair hold time issue. best regards
  11. P

    Constrain on pad or on core when using DC or PT

    Re: constrain on pad? We set constraints on core, then we hand instantiate PAD, lastly we through simulation to find and fix PAD related timing problem. best regards
  12. P

    AND gate using XOR gate

    and gate using xor gates It seems that a XOR is not a universe gate, it can't be used to construct a and gate. am I right. best regards
  13. P

    set_fix_multiple_ports_net ,what means?

    such as following statement in gate netlist: assign out = in; by running this command, DC will add a buffer to replace assign statement. best regards
  14. P

    Which is better for amplifying gain, transistor or op-amp?

    Re: Transistor vs op-amp that's up to the specific application, transistor amplifier is simple, cheap and can achieve high speed easily, but the gain precision is not as good as OP, OP can achieve good precision, but for very high speed, OP is expensive. best regards
  15. P

    measuring nanoampere current using milliammeter

    you can use a high impedance amplifier to amplify the voltage signal between the resistor, then you can use a general DVM to measure the output voltage and calculate the current in the resistor. best regards
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