hw6_su10_sol - VVSIG VSIG 0 AC 1 .AC DEC 5 100 100MEG 2...

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1. The HSPICE stack for simulating inverter behavior is as follows: Inverter Circuit .LIB ’models15 . txt ’ MOS M1 OUT IN VDD VDD pch L= 1 . 5 u W=10u M2 OUT IN 0 0 nch L= 1 . 5 u W=5u CL OUT 0 1p VVDD VDD 0 5 V ININ00PU L S E052 n1 n1 n5 n2 0 n .DC VIN 0 5 0.01 . PRINT DC V( IN ) V(OUT) .TRAN 100p 15n . PRINT TRAN V ( I N ) V (OUT) . OPTIONS LIST NODE POST .END a) Using CosmosScope as shown in Fig. 1a, DC plot is obtained, with the following values: V L =2 . 09 V, V H =3 . 13 V Figure 1a. DC analysis of inverter’s transfer characteristic b) Using CosmosScope as shown in Fig. 1b, transient plot is obtained, with the following values: V THL = 847 . 96 ps, V
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Figure 1b. Transient analysis of inverter behavior 2. a) The HSPICE stack for simulating the CMOS common-source ampli±er is as follows: OP and AC analysis . lib ’models15 . txt ’ MOS VVDD VDD 0 DC 2 . 5 VVSS VSS 0 DC 2.5 RD VDD VD 3 k RSIG VSIG VX 500k RG VG 0 1MEG RL VO 0 200k CC1 VX VG 10u CC2 VD VO 10u CS VS 0 1u IBIAS VS VSS 1m M1 VD VG VS VS NCH W=15u L=1.5u
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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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hw6_su10_sol - VVSIG VSIG 0 AC 1 .AC DEC 5 100 100MEG 2...

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