orcad103仿真问题

我在仿真一个三阶放大电路遇到如下问题，请问哪位大侠请给个指导，谢谢

ERROR -- Convergence problem in transient bias point calculation

Last node voltages tried were:

NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE

( 15V)-13.98E+06 ( GND)-13.98E+06 ( -15V)-13.98E+06 (N00534)-13.98E+06

(N00547)-13.98E+06 (N00560)-13.98E+06 (N00603)-13.98E+06 (N00675)-13.98E+06

(N00927)-13.98E+06 (N01098)-13.98E+06 (N01211)-13.98E+06 (N01639)-13.98E+06

(N06340)-13.98E+06 (X_U1.6) .0027 (X_U1.7)-13.98E+06 (X_U1.8)-13.98E+06

(X_U1.9) 0.0000 (X_U2.6) .0028 (X_U2.7)-13.98E+06 (X_U2.8)-13.98E+06

(X_U2.9) 0.0000 (X_U3.6) .0028 (X_U3.7)-13.98E+06 (X_U3.8)-13.98E+06

(X_U3.9) 0.0000 (X_U1.10)-13.98E+06 (X_U1.11)-13.98E+06

(X_U1.12)-13.98E+06 (X_U1.13)-13.98E+06

(X_U1.14)-13.98E+06 (X_U1.53)-13.98E+06

(X_U1.54)-13.98E+06 (X_U1.90) -.0041

(X_U1.91) 30.0000 (X_U1.92) -30.0000

(X_U1.99)-13.98E+06 (X_U2.10)-13.98E+06

(X_U2.11)-13.98E+06 (X_U2.12)-13.98E+06

(X_U2.13)-13.98E+06 (X_U2.14)-13.98E+06

(X_U2.53)-13.98E+06 (X_U2.54)-13.98E+06

(X_U2.90) -.0051 (X_U2.91) 30.0000

(X_U2.92) -30.0000 (X_U2.99)-13.98E+06

(X_U3.10)-13.98E+06 (X_U3.11)-13.98E+06

(X_U3.12)-13.98E+06 (X_U3.13)-13.98E+06

(X_U3.14)-13.98E+06 (X_U3.53)-13.98E+06

(X_U3.54)-13.98E+06 (X_U3.90) -.0030

(X_U3.91) 30.0000 (X_U3.92) -30.0000

(X_U3.99)-13.98E+06

These voltages failed to converge:

V(X_U2.90) = -6.514mV \ -5.107mV V(X_U3.90) = -4.384mV \ -3.035mV V(X_U1.90) = -3.308mV \ -4.085mV

These supply currents failed to converge:

I(X_U2.egnd) = 2.854uA \ 1.445uA I(X_U3.egnd) = 723.18nA \ -625.34nA I(X_U1.egnd) = -350.07nA \ 430.74nA I(X_U2.ve) = -66.57uA \ -65.93uA I(X_U2.vlim) = -6.514uA \ -5.107uA I(X_U3.ve) = -62.99uA \ -64.57uA I(X_U3.vlim) = -4.384uA \ -3.035uA I(X_U1.ve) = -63.63uA \ -62.77uA I(X_U1.vlim) = -3.308uA \ -4.085uA

Try running with .OPTION STEPGMIN

**** Interrupt ****