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Subject: Wide Swing Folded Cascode OTA

Date: 06/19/01 at 1:17 PM
Posted by: George Shafik
E-mail: gshafik@ieee.org
Message Posted:

Dear John

I wanted to ask about the following design of the wide swing folded cascode OTA with AMI 0.5um.
I download it from cmos.edu but I just noticed that not all the CMOS transistors have the bulk connected to the source.
Can you explain why ??
Please I need your advise ASAP.
Thanks for help & best regards.

George Shafik

****** Transient analysis (Step response)

* START OF WSFC_OTA.H
***** probe control ******
*.OPTION ABSTOL=1u ITL4=100 RELTOL=0.01 VNTOL=0.01mv
.probe
*.probe id(m1) id(m2) id(mon) V(vout) v(vi)
.tran 1n 110n 0.1n

******* VDD and input
VDD VDD 0 DC 5.0V
*Vi1 Vi1 0 DC 2.5V
Vi2 Vi2 0 DC 2.5V

**** for unity gain transient analysis
Vi Vi 0 PULSE(4.7 0.3 10n 1p 1p 50n 100n)
Rfb Vout Vi1 10K
Rin Vi Vi1 10K

* END OF WSFC_OTA.H

*MAIN CIRCUIT WSFC_OTA
Mb4 VN2 VN2 VDD VDD CMOSP L=0.6u W=9u
Mb1 VN1 VN1 0 0 CMOSN L=0.6u W=4.5u
Mb3 VN3 VN3 VN2 VN2 CMOSP L=0.6u W=9u
*Rbig Vi1 Vout 1G
*Rload 0 Vout 10K
*Cbig 0 Vi1 1
Mb52 Vbias2 Vbias1 VDD VDD CMOSP L=0.6u W=9u
Mb5 Vbias1 Vbias1 VDD VDD CMOSP L=0.6u W=9u
Mb51 VN4 Vbias1 VDD VDD CMOSP L=0.6u W=9u
Mb61 0 VN5 Vbias2 Vbias2 CMOSP L=0.6u W=9u
Mb6 VN5 VN5 Vbias1 Vbias1 CMOSP L=2.4u W=9u
Mb81 VDD VN4 Vbias3 0 CMOSN L=0.6u W=4.5u
Mb71 Vbias3 Vbias4 0 0 CMOSN L=0.6u W=4.5u
Mb8 VN4 VN4 Vbias4 0 CMOSN L=2.4u W=4.5u
Mb7 Vbias4 Vbias4 0 0 CMOSN L=0.6u W=4.5u
Mb11 VN5 VN1 0 0 CMOSN L=0.6u W=4.5u
M1 VN10 Vi1 VN7 0 CMOSN L=0.6u W=4.5u
M2 VN11 Vi2 VN7 0 CMOSN L=0.6u W=4.5u
M3 VN15 Vi1 VN8 VN8 CMOSP L=0.6u W=9u
M4 VN14 Vi2 VN8 VN8 CMOSP L=0.6u W=9u
M5 VN8 Vbias2 VN6 VN6 CMOSP L=0.6u W=9u
M6 VN6 Vbias1 VDD VDD CMOSP L=0.6u W=9u
M7 VN7 Vbias3 VN9 0 CMOSN L=0.6u W=4.5u
M8 VN9 Vbias4 0 0 CMOSN L=0.6u W=4.5u
Mo11 VN10 VN12 VDD VDD CMOSP L=0.6u W=9u
Mo12 VN11 VN12 VDD VDD CMOSP L=0.6u W=9u
Mo21 VN12 Vbias2 VN10 VN10 CMOSP L=0.6u W=9u
Mo22 Vo11 Vbias2 VN11 VN11 CMOSP L=0.6u W=9u
Mc1p VN13 Vbp VN12 VN12 CMOSP L=2.4u W=9u
Mc1n VN12 Vbn VN13 0 CMOSN L=2.4u W=4.5u
Mc2p Vo12 Vbp Vo11 Vo11 CMOSP L=2.4u W=9u
Mc2n Vo11 Vbn Vo12 0 CMOSN L=2.4u W=4.5u
Mo31 VN13 Vbias3 VN15 0 CMOSN L=0.6u W=4.5u
Mo32 Vo12 Vbias3 VN14 0 CMOSN L=0.6u W=4.5u
Mo41 VN15 VN13 0 0 CMOSN L=0.6u W=4.5u
Mo42 VN14 VN13 0 0 CMOSN L=0.6u W=4.5u
Mop Vout Vo11 VDD VDD CMOSP L=0.6u W=270u
Mon Vout Vo12 0 0 CMOSN L=0.6u W=135u
Mb2 VN1 VN1 VN3 VN3 CMOSP L=0.6u W=9u
Mbn1 VN17 Vbias1 VDD VDD CMOSP L=0.6u W=9u
Mbn2 Vbn Vbias2 VN17 VN17 CMOSP L=0.6u W=9u
Mbp1 VN16 VN16 VDD VDD CMOSP L=0.6u W=9u
Mbp2 Vbp Vbp VN16 VN16 CMOSP L=0.6u W=9u
Mbn4 VN18 VN18 0 0 CMOSN L=0.6u W=4.5u
Mbn3 Vbn Vbn VN18 0 CMOSN L=0.6u W=4.5u
Mbp4 VN19 Vbias4 0 0 CMOSN L=0.6u W=4.5u
Mbp3 Vbp Vbias3 VN19 0 CMOSN L=0.6u W=4.5u

* START OF AMI05PROCESS.TXT

* AMI 0.5um process
* Temperature_parameters=Default
.MODEL CMOSN NMOS ( LEVEL = 49
+VERSION = 3.1 TNOM = 27 TOX = 1.39E-8
+XJ = 1.5E-7 NCH = 1.7E17 VTH0 = 0.7017585
+K1 = 0.7943165 K2 = -0.0702422 K3 = 14.5650185
+K3B = -7.6185928 W0 = 1E-8 NLX = 1E-9
+DVT0W = 0 DVT1W = 0 DVT2W = 0
+DVT0 = 1.7959659 DVT1 = 0.9301213 DVT2 = -0.4653734
+U0 = 463.0259389 UA = 1.06963E-10 UB = 1.524857E-18
+UC = 1.244664E-11 VSAT = 9.842843E4 A0 = 0.4853288
+AGS = 0.157727 B0 = 3.143144E-6 B1 = 3.039002E-6
+KETA = -0.0133654 A1 = 0 A2 = 1
+RDSW = 2.667837E3 PRWG = -0.033554 PRWB = 7.73026E-3
+WR = 1 WINT = 1.81305E-7 LINT = 9.846764E-8
+XL = 0 XW = 0 DWG = 1.427202E-9
+DWB = 3.818685E-8 VOFF = -0.0896698 NFACTOR = 1.2143784
+CIT = 0 CDSC = 1.171765E-4 CDSCD = 1E-3
+CDSCB = 2.979369E-5 ETA0 = 5.31841E-4 ETAB = -1.442725E-3
+DSUB = 0.0291302 PCLM = 1.2511312 PDIBLC1 = 9.0802E-3
+PDIBLC2 = 3.381073E-3 PDIBLCB = 4.90275E-3 DROUT = 0.38254
+PSCBE1 = 5.646428E9 PSCBE2 = 2.684598E-9 PVAG = 0.0905036
+DELTA = 0.01 MOBMOD = 1 PRT = 0
+UTE = -1.5 KT1 = -0.11 KT1L = 0
+KT2 = 0.022 UA1 = 4.31E-9 UB1 = -7.61E-18
+UC1 = -5.6E-11 AT = 3.3E4 WL = 0
+WLN = 1 WW = 0 WWN = 1
+WWL = 0 LL = 0 LLN = 1
+LW = 0 LWN = 1 LWL = 0
+CAPMOD = 2 XPART = 0.4 CGDO = 1.9E-10
+CGSO = 1.9E-10 CGBO = 1E-11 CJ = 4.266435E-4
+PB = 0.99 MJ = 0.4481178 CJSW = 3.152209E-10
+PBSW = 0.5007282 MJSW = 0.1339493 PVTH0 = 0.0435
+PRDSW = -84.1338046 PK2 = 0.0170019 WKETA = 0.0188633
+LKETA = -1.06224E-3 PAGS = 0.18 )
*
.MODEL CMOSP PMOS ( LEVEL = 49
+VERSION = 3.1 TNOM = 27 TOX = 1.39E-8
+XJ = 1.5E-7 NCH = 1.7E17 VTH0 = -0.9222344
+K1 = 0.5286056 K2 = 0.0164217 K3 = 19.073021
+K3B = -0.4797813 W0 = 6.975844E-7 NLX = 1.111222E-8
+DVT0W = 0 DVT1W = 0 DVT2W = 0
+DVT0 = 2.5822866 DVT1 = 0.5164229 DVT2 = -0.1034175
+U0 = 216.4744404 UA = 2.364712E-9 UB = 1.397751E-18
+UC = -1.82898E-11 VSAT = 1.725928E5 A0 = 0.7471958
+AGS = 0.216641 B0 = 3.761497E-6 B1 = 5E-6
+KETA = -3.728669E-3 A1 = 0 A2 = 1
+RDSW = 2.846814E3 PRWG = -0.0438144 PRWB = -9.258116E-3
+WR = 1 WINT = 2.292245E-7 LINT = 1.686837E-8
+XL = 0 XW = 0 DWG = -1.536617E-8
+DWB = 2.290623E-8 VOFF = -0.0956807 NFACTOR = 0.9637884
+CIT = 0 CDSC = 5.707153E-4 CDSCD = 2.363737E-4
+CDSCB = 1E-3 ETA0 = 0.0973843 ETAB = -4.998447E-3
+DSUB = 0.4094143 PCLM = 4.6138537 PDIBLC1 = 2.809581E-4
+PDIBLC2 = 4.712886E-4 PDIBLCB = -1E-3 DROUT = 1.973287E-3
+PSCBE1 = 1.235615E10 PSCBE2 = 5.003179E-10 PVAG = 14.922733
+DELTA = 0.01 MOBMOD = 1 PRT = 0
+UTE = -1.5 KT1 = -0.11 KT1L = 0
+KT2 = 0.022 UA1 = 4.31E-9 UB1 = -7.61E-18
+UC1 = -5.6E-11 AT = 3.3E4 WL = 0
+WLN = 1 WW = 0 WWN = 1
+WWL = 0 LL = 0 LLN = 1
+LW = 0 LWN = 1 LWL = 0
+CAPMOD = 2 XPART = 0.4 CGDO = 2.42E-10
+CGSO = 2.42E-10 CGBO = 1E-11 CJ = 7.303593E-4
+PB = 0.9569 MJ = 0.5047944 CJSW = 2.120694E-10
+PBSW = 0.8208359 MJSW = 0.1000002 PVTH0 = 0.0216698
+PRDSW = -289.7604508 PK2 = 2.207291E-3 WKETA = -2.067279E-4
+LKETA = -4.885431E-3 )
*
* END OF AMI05PROCESS.TXT
.END


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