[問題] offset差很多..該如何調？

[chrisenzo (5566)]

目標
Gain>=60dB, Unity Gain frequency>=60MHz,
Phase Margin>=45Deg, Offset<=50uV,
Dynamic Rage =+/-6.5V (for 10mv error),
Slew Rate>=80 V/us.
目前
Gain=61dB, Unity Gain frequency=102MHz,
Phase Margin>=48Deg, Offset=88muV,
Dynamic Rage =+6.5/-6V (for 10mv error),
Slew Rate= 82 /-1.5G

採用.35製程
M1  s1  In1  d1  VDD pch_hva  L=1.5U  W=4U
M2  s2  In2  d1  VDD pch_hva  L=1.5U  W=4U
M3  s1  s1  VSS  VSS nch_hva  L=1.5U  W=10U
M4  s2  s1  VSS  VSS nch_hva  L=1.5U  W=10U
M5  d1  g5  VDD  VDD pch_hva  L=1.5U  W=5U
M7 u2 g5  VDD  VDD pch_hva  L=1.5U  W=30.0U
M6  u2  s2  VSS  VSS nch_hva  L=1.5U  W=350.0U
M8 g5 g5  VDD  VDD pch_hva  L=1.5U  W=5U
M9 out12 g5  VDD  VDD pch_hva  L=1.5U  W=63U
M10  out12  u2  VSS  VSS nch_hva  L=1.5U  W=25U
I12 g5 GND 0.25mA
c1 g5 out12 2.8pf

採用此結構 圖中的size是舊的
http://i.imgur.com/yrDktPD.png

另外為何hspice和tspice的結果會差這麼多啊
途中的size放入hspice跑全部條件都過..
放pspice PM從120變負的...
懇請賜教了....QQ
剛溫

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