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Recent content by mickey_melomane

  1. M

    how do you design a cross coupled cmos latch?

    cross-coupled latch refer to Phillip Allen and Douglas holberg "CMOS Analog Circuit Design" for analysis of latches.
  2. M

    [Solved] Agilent ADS : determining impedance @ one point ??

    Agilent ADS : determining impedance @ one point ?? hmmm... why dont you place a port at the desired node, and measure the reflection coefficient. From that you can obtain your Impedance. Sidharth
  3. M

    Weak inversion biasing - need for or advantage of

    Weak inversion biasing Does the same thing apply to the input transistors of a 5-T NMOS input differential amplifier? Or which amplifiers of a 5-T diff pair, be biased in weak inversion. (assuming current source load or current mirror load)
  4. M

    Weak inversion biasing - need for or advantage of

    Re: Weak inversion biasing Could you please explain in detail as to why you need larger gm/I ratio... and what is meant by bias margin... Shouldn't Vgs increase for higher drain currents, provided Vd does not fall below Vdsat...?
  5. M

    Weak inversion biasing - need for or advantage of

    weak inversion What is the (need for/advantage of) biasing a transistor in Weak inversion region? Plz list some tutorials if anyone might know! Sidharth
  6. M

    can capacitors be used as power supplies ??

    capacitors used as back up supplies capacitors can store charges ... agreed... So they may be used as voltage sources... agreed again! But they cannot produce voltages for a long time, as they cannot deliver current!!! They deliver current to the load by a decrease in the voltage across it...
  7. M

    FRACTIONAL-N PLL USING SIGMA DELTA MODULATOR

    FRACTIONAL-N PLL u have a number of papers on this.. just google it, or go to IEEE and do a random search...
  8. M

    second order banggap reference ??

    you implement temperature insensitivity by forcing an NTAT current , a PTAT current and a PTAT-square current, rather than an NTAT+PTAT current
  9. M

    Question about analog output and ADC input

    Wrtie an equation describing the scaling from (0.88, 3.5) to (0,2.5). Implement this equation using opamps. This worked for me at RF operation, to change swing levels.
  10. M

    How to determine the phase margin of an opamp in Cadence?

    How do u determine the phase margin of an opamp in Cadence?
  11. M

    Sigma Delta converter : NTF synthesis

    sigma delta ntf synthesis Hi... I used the Schreier Sigma Delta toolbox to design my NTF of order 3... How do I realize the loop filter in an easily implementable way!!! I mean without using CIFF or CIFB architectures..? Moreover, I am trying to do the bandpass modulator for GSM as well...
  12. M

    CMOS down conversion mixer

    CMOS mixers are of two kinds - Active and Passive 1. Active Mixers are of the Gilbert cell type... 2. Passive Mixers are mere switches... You may refer to any of the RF design books... For learning about them, Refer to Razavi's "RF Microelectronics", or Thomas Lee's CMOS RF IC Design...
  13. M

    Resonant frequency chart for a filter using L's and C's

    Resonant frequency chart Lumped L's are not good for higher frequencies... Why? The reactance of an 'L' increases with frequency... XL=L*omega But as frequency increases, the capacitance between two turns of the inductor oil, begins to dominate the impedance, thus resulting in a decrease in...
  14. M

    what is digital thermometer code..??

    thermometer code encoding A Flash ADC will give u a thermometer coded output... For a 3 bit Flash ADC, there are 2^3=8 levels... So outputs are 0000000,0000001,0000011,0000111,0001111,0011111, 0111111,11111111... (Notice that u have 2^N-1 bits for a 2^N ADC... These are converted to a 3-bit...
  15. M

    how to generate stair output of flash adc

    You may extract the thermometer coded output, and convert to binary, using VerilogA... After all a coding script... Then store the transformed data, and export onto MATLAB...
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