1. R

    Need help with DAB Converter

    I made my DAB Converter in LTspice and it seems to work whenever the NMOS are replaced with switches but I have no idea why if I just replace them the switches with MOSFETs it doesn't work anymore. As shown in the screenshot if I replace the NMOS for the S1 PWM as well as the S4 PWM, my DAB...
  2. One Does Not Simply

    Trouble with NMOS half-bridge

    Hi, I am trying to drive a half-bridge. circuit-1 is the main circuit diagram relevant to this post. circuit-2 contains the remaining circuit. The CMOS-H pair is driven by Q, and the CMOS-L pair is driven by Q-INV. CMOS-H drives IPP-H, while CMOS-L drives IPP-L. Q, Q-INV, and the rest of the...
  3. T

    How and when to use a NMOS and PMOS as current source/sink and voltage source in a circuit?

    as my question state, I am having trouble understanding the circuit using a NMOS/PMOS as a current source or voltage source according to the pins they are connected and also the input and output impedance present when looking at only one pin of the MOS. my lack of understanding comes in the...
  4. Koelite

    Two NMOS in series (steady state)

    Hello, I am stuck on an exercise for a while with the circuit as shown below: We have: \[ V_{DD}=3.3 V \\ V_{tn0}=0.65 V \\ \gamma=0.5 V^{1/2} \\ 2\phi _{f}=0.6 V \\ V_{1}=2.85 V \] The question is: What is the best approximation for V2 in steady state? (a) 0 V (b) 0.65 V (c) 2.2 V (d) 2.65 V...
  5. K

    NMOS IV characteristic completely different with 2 similar setup

    I am plotting the IV characteristics of the NMOS of 2 similar setups. Here I sweep the Vg from -13 to 13V and vdd from 0 to 50. note that the only difference is that vdd is positive for one but negative for the other. both grounded at the other end. But why I am getting 2 different IV...
  6. marcell46

    Small signal analysis of MOSFET circuit

    The other day I got the following exercise on one of my exams: For those who don't speak German, for transistor 1 lambda is 0, but not for the others. The backgate-effekt should be neglected alltogether. I drew the following small signal equivalent circuit (ignore the black texts for now)...
  7. Bruno Malbusca

    Power switch PMOS controlled by button or Microcontroller (or both)

    Hello, I´m trying to design an analog circuit to use a push button to turn on an MCU and then use it the same push button to change modes. A "one push button circuit". To achieve that, I used a pmos to work as a switch on the power signal and then used a 2 nmos circuit for or signal circuit that...
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