Explore BrainMass

Explore BrainMass

    Circuit design

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    I have attached a cmos library for various transistors that pspice does not currently have. I only have access to the Q2N2222 BJT, CD4007 MOS transistor and the 2n7000 transistor and of course all the various resistors and capacitors. If you could please help me design a circuit with the attached specifications using only the parts I have mentioned, and I am actually trying to build this circuit so it would be nice if the resistance values used in calculations were close to normal physical resistor values but is not necessary, I understand that they will not be exact. And any pieces that pspice does not currently support will be in the cmos library I attached. Just in case you need instruction on how to import them.

    1. Download cmos.slb and cmos.lib, and store in your hard disk
    (preferably, within C:Program FilesOrCAD_DemoPspiceUserLib).
    Remove the index file cmos.ind if you have an earlier version.
    2. From Pspice Schematics menu:
    Choose Options -> Editor Configuration
    Click on Library Settings
    Click on Browse, find cmos.slb, and click on Open
    Click on Add*
    Click on OK, OK.
    3. From Pspice Schematics menu:
    Choose Analysis -> Library and Include Files
    Click on Browse, find cmos.lib, and click on Open
    Click on Add Library*
    Click on OK.

    Circuit Specifications
    Design a three-stage amplifier with Bipolar and CMOS transistors to satisfy the following constraints.
    Note. the design should use standard value resistors (no potentiometers).
    - Av >= 0
    - Ra 2 200 Kohm
    - Harmonica distortion below -30dB with vi-. I $rnV¢. (l0mV,,)
    - Vq: I tnlnlrnur required. but absolute mas-SV
    - Ri-4 I 80. Note, you may have to use multiple transistors in parallel in the output stage to drive
    this load. Check the power ratings of the transistors.
    - Use a minimum of MOSFETs in your design. Note. if desired you cart use more and also
    BITS. but the intent is the MOSFE'l's are a key part of your design.
    describe the design procedure stage-by-stage. beginning with the output stage.
    Provide sufficient theoretical and quantitative justification on the 'liq-3 choice. Try to optimize Vu-
    on a per-stage basis to achieve the lowest power.
    Needed PSPICE simulation results:
    i DC operating points [voltages & currents} for each stage
    - AC Plots fi'om 1[lDHz to lt]IIIIkI-I2: Av, Rm
    - Transient plot of output signal with input of a sine wave of 5n1V amplitude
    ¢ Frequency domain plot of above transient which shows the harmonic distortion. Note, to verify
    the -3IIldB harmonic distortion spec, Idle harmonic distortion for a given harmonic is the ratio of
    the harmonic power over the fiind a rnental power.
    - Include the text output of the Fourier Analysis which states the Total Harmonic Distortion
    - Total power dissipation

    © BrainMass Inc. brainmass.com October 10, 2019, 6:16 am ad1c9bdddf


    Solution Summary

    This posting contains the solution to the given problem.