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Recent content by redapplepie

  1. R

    Resistor in bioolar current mirror with beta helper

    Hello all: A bipolar current mirror with beta helper is aiways used. Sometimes I can see that a resistor is connected between the common base node and the ground. But in classic books ,such as gray and meyer's book,there is no resistor fron the common base node and the ground. I want to know...
  2. R

    Why the shunt resistor is used in a digital buffer?

    Hello all: A digital buffer is always made by two cascaded cmos inverters. I can always see that a shunt feedback resistor is usually connect from the output of the first inverter to its input. I want to know why the shunt resistor is used? What's its purpose? By the way, the digital buffer...
  3. R

    beta helper - what is the resistor used for?

    beta helper A bipolar current mirror with beta helper is aiways used. Sometimes I can see that a resistor is connected between the common base node and the ground. But in classic books ,such as gray and meyer's book,there is no resistor fron the common base node and the ground. I want to know...
  4. R

    Digital buffer - why the shunt resistor is used?

    digital buffer output impedance A digital buffer is always made by two cascaded cmos inverters. I can always see that a shunt feedback resistor is usually connect from the output of the first inverter to its input. I want to know why the shunt resistor is used? What's its purpose?
  5. R

    How to measure I/Q mismatch?

    using oscillograph?thanks
  6. R

    How do you calculate electromigration and how to avoid it?

    Re: electromigration i read the design manul again. it says 1um width metal1 can carry at least 7.8mA Irms. can my chip burn open as soon as i power my chip up?
  7. R

    How do you calculate electromigration and how to avoid it?

    Re: electromigration hi i have a question.i use 1um width metal1 wire to carry 4mA dc current .the design manul of my technology says that 1um width metal1 carry 0.8mA in the electromigration section of the DRM. what i want to know is ,can the circuit work for a short while .can the thin 1um...

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