spice.txt

spice中支持多层次元件模型仿真的可单独运行的插件源码

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SUBJECT: Exponential
TITLE: Exponential
TEXT: H
TEXT: H _3._2._1._3.  _E_x_p_o_n_e_n_t_i_a_l
TEXT: H
TEXT: H _G_e_n_e_r_a_l _F_o_r_m:
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TEXT: H     EXP(V1 V2 TD1 TAU1 TD2 TAU2)
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TEXT: H
TEXT: H _E_x_a_m_p_l_e_s:
TEXT: H
TEXT: H     VIN 3 0 EXP(-4 -1 2NS 30NS 60NS 40NS)
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TEXT: H      parameter                   default value   units
TEXT: H      ---------------------------------------------------------
TEXT: H      V1   (initial value)                        Volts or Amps
TEXT: H      V2   (pulsed value)                         Volts or Amps
TEXT: H      TD1  (rise delay time)      0.0             seconds
TEXT: H      TAU1 (rise time constant)   TSTEP           seconds
TEXT: H      TD2  (fall delay time)      TD1+TSTEP       seconds
TEXT: H      TAU2 (fall time constant)   TSTEP           seconds
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TEXT: H
TEXT: H      The shape of the waveform is described by the following
TEXT: H table:
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TEXT: H
TEXT: H
TEXT: H      time           value
TEXT: H      ----------------------------------------------------------------------------
TEXT: H       0 to TD1      V1
TEXT: H                                    |     ------------|
TEXT: H                                              TAU1
TEXT: H                                    |    -(t - TD1)   |                -(t - TD2)
TEXT: H      TD1 to TD2     V1 + (V2 - V1)  1 - e
TEXT: H                                    |    ----------|             |     ----------|
TEXT: H                                    |       TAU1   |             |        TAU2   |
TEXT: H      TD2 to TSTOP   V1 + (V2 - V1)   - e            + (V1 - V2)  1 - e
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SUBJECT: PieceWise Linear
TITLE: Piece-Wise Linear
TEXT: H
TEXT: H _3._2._1._4.  _P_i_e_c_e-_W_i_s_e _L_i_n_e_a_r
TEXT: H
TEXT: H _G_e_n_e_r_a_l _F_o_r_m:
TEXT: H
TEXT: H     PWL(T1 V1 <T2 V2 T3 V3 T4 V4 ...>)
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TEXT: H
TEXT: H _E_x_a_m_p_l_e_s:
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TEXT: H     VCLOCK 7 5 PWL(0 -7 10NS -7 11NS -3 17NS -3 18NS -7 50NS -7)
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TEXT: H
TEXT: H      Each pair of values (Ti, Vi) specifies that  the  value
TEXT: H of  the  source  is  Vi  (in Volts or Amps) at time=Ti.  The
TEXT: H value of the source at intermediate values of time is deter-
TEXT: H mined by using linear interpolation on the input values.
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SUBJECT: SingleFrequency FM
TITLE: Single-Frequency FM
TEXT: H
TEXT: H _3._2._1._5.  _S_i_n_g_l_e-_F_r_e_q_u_e_n_c_y _F_M
TEXT: H
TEXT: H _G_e_n_e_r_a_l _F_o_r_m:
TEXT: H
TEXT: H     SFFM(VO VA FC MDI FS)
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TEXT: H
TEXT: H _E_x_a_m_p_l_e_s:
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TEXT: H     V1 12 0 SFFM(0 1M 20K 5 1K)
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TEXT: H      parameter                 default value   units
TEXT: H      -------------------------------------------------------
TEXT: H      VO  (offset)                              Volts or Amps
TEXT: H      VA  (amplitude)                           Volts or Amps
TEXT: H      FC  (carrier frequency)   1/TSTOP         Hz
TEXT: H      MDI (modulation index)
TEXT: H      FS  (signal frequency)    1/TSTOP         Hz
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TEXT: H
TEXT: H The shape of the waveform  is  described  by  the  following
TEXT: H equation:
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TEXT: H
TEXT: H                        |                            |
TEXT: H        V(t)=V  + V  sin 2 J FC t + MDI sin(2 J FS t)
TEXT: H              O    A    |                            |
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SUBJECT: Linear Dependent Sources
TITLE: Linear Dependent Sources
TEXT: H
TEXT: H _3._2._2.  _L_i_n_e_a_r _D_e_p_e_n_d_e_n_t _S_o_u_r_c_e_s
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TEXT: H
TEXT: H      SPICE  allows  circuits  to  contain  linear  dependent
TEXT: H sources characterized by any of the four equations
TEXT: H
TEXT: H         i = g v          v = e v          i = f i          v
TEXT: H = h i
TEXT: H
TEXT: H where g, e, f, and h are constants representing transconduc-
TEXT: H tance,  voltage  gain,  current  gain,  and transresistance,
TEXT: H respectively.
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SUBTOPIC: SPICE:Linear VoltageControlled Current Sources
SUBTOPIC: SPICE:Linear VoltageControlled Voltage Sources
SUBTOPIC: SPICE:Linear CurrentControlled Current Sources
SUBTOPIC: SPICE:Linear CurrentControlled Voltage Sources

SUBJECT: Linear VoltageControlled Current Sources
TITLE: Linear Voltage-Controlled Current Sources
TEXT: H
TEXT: H _3._2._2._1.  _L_i_n_e_a_r _V_o_l_t_a_g_e-_C_o_n_t_r_o_l_l_e_d _C_u_r_r_e_n_t _S_o_u_r_c_e_s
TEXT: H
TEXT: H _G_e_n_e_r_a_l _f_o_r_m:
TEXT: H
TEXT: H     GXXXXXXX N+ N- NC+ NC- VALUE
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TEXT: H
TEXT: H _E_x_a_m_p_l_e_s:
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TEXT: H     G1 2 0 5 0 0.1MMHO
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TEXT: H      N+ and N- are  the  positive  and  negative  nodes,
TEXT: H respectively.   Current  flow is from the positive node,
TEXT: H through the source, to the negative node.  NC+  and  NC-
TEXT: H are the positive and negative controlling nodes, respec-
TEXT: H tively.  VALUE is the transconductance (in mhos).
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SUBJECT: Linear VoltageControlled Voltage Sources
TITLE: Linear Voltage-Controlled Voltage Sources
TEXT: H
TEXT: H _3._2._2._2.  _L_i_n_e_a_r _V_o_l_t_a_g_e-_C_o_n_t_r_o_l_l_e_d _V_o_l_t_a_g_e _S_o_u_r_c_e_s
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TEXT: H _G_e_n_e_r_a_l _f_o_r_m:
TEXT: H
TEXT: H     EXXXXXXX N+ N- NC+ NC- VALUE
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TEXT: H
TEXT: H _E_x_a_m_p_l_e_s:
TEXT: H
TEXT: H     E1 2 3 14 1 2.0
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TEXT: H      N+ is the positive node, and  N-  is  the  negative
TEXT: H node.   NC+  and  NC- are the positive and negative con-
TEXT: H trolling nodes,  respectively.   VALUE  is  the  voltage
TEXT: H gain.
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SUBJECT: Linear CurrentControlled Current Sources
TITLE: Linear Current-Controlled Current Sources
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TEXT: H _3._2._2._3.  _L_i_n_e_a_r _C_u_r_r_e_n_t-_C_o_n_t_r_o_l_l_e_d _C_u_r_r_e_n_t _S_o_u_r_c_e_s
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TEXT: H _G_e_n_e_r_a_l _f_o_r_m:
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TEXT: H     FXXXXXXX N+ N- VNAM VALUE
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TEXT: H
TEXT: H _E_x_a_m_p_l_e_s:
TEXT: H
TEXT: H     F1 13 5 VSENS 5
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TEXT: H      N+ and N- are  the  positive  and  negative  nodes,
TEXT: H respectively.   Current  flow is from the positive node,
TEXT: H through the source, to the negative node.  VNAM  is  the
TEXT: H name  of  a voltage source through which the controlling
TEXT: H current flows.  The direction  of  positive  controlling
TEXT: H current  flow  is  from  the  positive node, through the
TEXT: H source, to the negative node  of  VNAM.   VALUE  is  the
TEXT: H current gain.
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SUBJECT: Linear CurrentControlled Voltage Sources
TITLE: Linear Current-Controlled Voltage Sources
TEXT: H
TEXT: H _3._2._2._4.  _L_i_n_e_a_r _C_u_r_r_e_n_t-_C_o_n_t_r_o_l_l_e_d _V_o_l_t_a_g_e _S_o_u_r_c_e_s
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TEXT: H _G_e_n_e_r_a_l _f_o_r_m:
TEXT: H
TEXT: H     HXXXXXXX N+ N- VNAM VALUE
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TEXT: H _E_x_a_m_p_l_e_s:
TEXT: H
TEXT: H     HX 5 17 VZ 0.5K
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TEXT: H
TEXT: H      N+ and N- are  the  positive  and  negative  nodes,
TEXT: H respectively.   VNAM  is  the  name  of a voltage source
TEXT: H through which the controlling current flows.  The direc-
TEXT: H tion  of  positive  controlling current flow is from the
TEXT: H positive node, through the source, to the negative  node
TEXT: H of VNAM.  VALUE is the transresistance (in ohms).
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SUBJECT: Nonlinear Dependent Sources
TITLE: Non-linear Dependent Sources
TEXT: H
TEXT: H _3._2._3.  _N_o_n-_l_i_n_e_a_r _D_e_p_e_n_d_e_n_t _S_o_u_r_c_e_s
TEXT: H
TEXT: H _G_e_n_e_r_a_l _f_o_r_m:
TEXT: H
TEXT: H     BXXXXXXX N+ N- <I=EXPR> <V=EXPR>
TEXT: H
TEXT: H
TEXT: H _E_x_a_m_p_l_e_s:
TEXT: H
TEXT: H     B1 0 1 I=cos(v(1))+sin(v(2))
TEXT: H     B1 0 1 V=ln(cos(log(v(1,2)^2)))-v(3)^4+v(2)^v(1)
TEXT: H     B1 3 4 I=17
TEXT: H     B1 3 4 V=exp(pi^i(vdd))
TEXT: H
TEXT: H
TEXT: H
TEXT: H      _N+ is the positive node, and _N- is the  negative  node.
TEXT: H The  values of the V and I parameters determine the voltages
TEXT: H and currents across and through  the  device,  respectively.
TEXT: H If  I is given then the device is a current source, and if V
TEXT: H is given the device is a voltage source.  One and  only  one
TEXT: H of these parameters must be given.
TEXT: H
TEXT: H      The small-signal AC behavior of the nonlinear source is
TEXT: H a  linear dependent source (or sources) with a proportional-
TEXT: H ity constant equal to the derivative (or derivatives) of the
TEXT: H source at the DC operating point.
TEXT: H
TEXT: H
TEXT: H      The expressions given for V and I may be  any  function
TEXT: H of voltages and currents through voltage sources in the sys-
TEXT: H tem.  The following functions of real variables are defined:
TEXT: H
TEXT: H                 abs     asinh   cosh   sin
TEXT: H                 acos    atan    exp    sinh
TEXT: H                 acosh   atanh   ln     sqrt
TEXT: H                 asin    cos     log    tan
TEXT: H
TEXT: H
TEXT: H
TEXT: H      The function "u" is the  unit  step  function,  with  a
TEXT: H value  of  one for arguments greater than one and a value of
TEXT: H zero for arguments less than zero.  The function "uramp"  is
TEXT: H the  integral of the unit step: for an input _x, the value is
TEXT: H zero if _x is less than zero, or if _x is  greater  than  zero
TEXT: H the value is _x.  These two functions are useful in sythesiz-
TEXT: H ing piece-wise non-linear functions, though convergence  may
TEXT: H be adversely affected.
TEXT: H
TEXT: H
TEXT: H      The following standard operators are defined:
TEXT: H
TEXT: H      +       -       *       /       ^       unary -
TEXT: H
TEXT: H
TEXT: H      If the argument of log, ln, or sqrt becomes  less  than
TEXT: H zero,  the  absolute  value  of  the argument is used.  If a
TEXT: H divisor becomes zero or the argument of log  or  ln  becomes
TEXT: H zero,  an  error will result.  Other problems may occur when
TEXT: H the argument for a function in a partial derivative enters a
TEXT: H region where that function is undefined.
TEXT: H
TEXT: H
TEXT: H      To get time into the expression you can  integrate  the
TEXT: H current  from a constant current source with a capacitor and
TEXT: H use the resulting voltage (don't forget to set  the  initial
TEXT: H voltage  across the capacitor).  Non-linear resistors, capa-
TEXT: H citors, and inductors may be synthesized with the  nonlinear
TEXT: H dependent  source.   Non-linear resistors are obvious.  Non-
TEXT: H linear capacitors and inductors are implemented  with  their
TEXT: H linear  counterparts  by  a  change of variables implemented
TEXT: H with the nonlinear dependent source.  The following  subcir-
TEXT: H cuit will implement a nonlinear capacitor:
TEXT: H
TEXT: H     .Subckt nlcap   pos neg
TEXT: H     * Bx: calculate f(input voltage)
TEXT: H     Bx   1    0    v = f(v(pos,neg))
TEXT: H     * Cx: linear capacitance
TEXT: H     Cx   2    0    1
TEXT: H     * Vx