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Common Source Amplifier

Common Source Amplifier. Outline. Current Source (Sec. 7.1) CS CS CS with Current-Source Load (Sec 7.2.2.) Design a CS with current-source load using gm/ID design flow. Current Source. Common Source Amplifier. Include Channel Length Modulation. CS Stage with Current-Source Load.

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Common Source Amplifier

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  1. Common Source Amplifier

  2. Outline • Current Source (Sec. 7.1) • CS • CS • CS with Current-Source Load (Sec 7.2.2.) • Design a CS with current-source load using gm/ID design flow

  3. Current Source

  4. Common Source Amplifier

  5. Include Channel Length Modulation

  6. CS Stage with Current-Source Load

  7. Design Example • Requirement • 1 uA • Get a voltage gain of 30 • Initial assumptions • (gm/ID)1=20, (gm/ID)2=8 • VDS1=VSD2=0.6 V • VSB1=VBS2=0.6 V • Length=‘600nm’

  8. Design Exploration • Initial results • ro1=2.228 Mohms • ro2=5.32 Mohms • Av=-31.4 V/V • gmovergds1=44.57 • gmvoergds2=42.5

  9. Plot of gm/gds for M1 gm/gds gm/ID gmovergds=dBrowse2D(gmoverid, 'nfet', '1.0u', 'vds', 0.5, 0.6, 0.6, 'vsb', 0.0, 0.1, 0.0, 'gmovergds'); (Can not increase gm/gds by increasing by gmoverid)

  10. Increase gm/gds by using a longer L (Not much improvement!)

  11. gm/gds_1 for M2 (gm/gds) (gm/ID) gmovergds_2=dBrowse2D(gmoverid_2, 'pfet', length_2, 'vsd', 0.5, 0.6, 0.6, 'vbs', 0.0, 0.1, 0.0, 'gmovergds')

  12. DC Simulation

  13. Split Plots

  14. Waveforms shown Separately on Two Plots

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