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Unformatted text preview: VVSIG VSIG 0 AC 1 .AC DEC 5 100 100MEG 2 .OPTIONS LIST NODE POST .PRINT AC VDB(VO) .END b) The values at the DC bias point are as follows, from the .IC0 Fle: vd = 500 . 0000 m, vg = 0 , vs = 1 . 9512[ V olts ] rom manual calculation, we have: g m = r 2 n C ox W L I D = r 2 135 15 1 . 5 1 m = 1 . 64 mA V V ov = 2 I D g m = 2 1 m 1 . 64 m = 1 . 22 V V GS = V ov + V T = 1 . 22 + 0 . 7 = 1 . 92 V Assuming negligible leakage gate current through R G resistor, we then have: V G , V S = V G V GS = 1 . 92 V V D = V DD I D R D = 2 . 5 1 m 3 k = . 5 V We observe that the manually-calculated results match the simulated values closely. c) The plot of the transfer function in dB is shown in ig. 7, along with the appropriate measurements. igure 7. AC simulation results and measurements 3 (FYI only. This part was removed from the assignment) (Measurements shown were not part of the assignment)...
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- Spring '11