spice.txt

支持数字元件仿真的SPICE插件

TEXT: H          for details.  Only available in GspiceH.
TEXT: H
TEXT: 
SEEALSO: SPICE:trananalysis

SUBJECT: save
TITLE: save
TEXT: 
TEXT:      Gsave H[ Gall H] [ _n_o_d_e_n_a_m_e ] ...
TEXT: H          Save a set of outputs, discarding the rest. If a node
TEXT: H          has been mentioned in a Gsave Hcommand, it will appear in
TEXT: H          the working plot after a run has completed, or in the
TEXT: H          rawfile if spice is run in batch mode (in this case,
TEXT: H          the command can be given in the input file as G.save
TEXT: H          ...H). If a node is traced or plotted it will also be
TEXT: H          saved.  If no Gsave Hcommands are given, all nodes will
TEXT: H          be saved.
TEXT: H
TEXT: 
SEEALSO: NUTMEG:status

SUBJECT: trananalysis
TITLE: Transient Analysis
TEXT: 
TEXT:                The transient analysis portion of  SPICE  computes  the
TEXT: H          transient  output  variables  as  a  function of time over a
TEXT: H          user-specified time interval.  The  initial  conditions  are
TEXT: H          automatically  determined  by  a  dc  analysis.  All sources
TEXT: H          which are not time dependent (for example,  power  supplies)
TEXT: H          are  set  to their dc value.  The transient time interval is
TEXT: H          specified on a G.TRAN Hcontrol line.
TEXT: H
TEXT:           GGeneral form:
TEXT: H
TEXT:                .TRAN H_T_S_T_E_P _T_S_T_O_P <_T_S_T_A_R_T <_T_M_A_X>> <_U_I_C>
TEXT: H
TEXT:           GExamples:
TEXT: H
TEXT:                .TRAN 1NS 100NS
TEXT: H               .TRAN 1NS 1000NS 500NS
TEXT: H               .TRAN 10NS 1US UIC
TEXT: H
TEXT: 
TEXT:                H_T_S_T_E_P is the printing or plotting increment  for  line-
TEXT: H          printer  output.   For use with the post-processor, _T_S_T_E_P is
TEXT: H          the suggested computing increment.  _T_S_T_O_P is the final time,
TEXT: H          and _T_S_T_A_R_T is the initial time.  If _T_S_T_A_R_T is omitted, it is
TEXT: H          assumed to be zero.  The transient analysis always begins at
TEXT: H          time  zero.   In the interval <zero, _T_S_T_A_R_T>, the circuit is
TEXT: H          analyzed (to reach a  steady  state),  but  no  outputs  are
TEXT: H          stored.   In  the  interval  <_T_S_T_A_R_T, _T_S_T_O_P>, the circuit is
TEXT: H          analyzed and outputs are stored.  _T_M_A_X is the maximum  step-
TEXT: H          size  that  SPICE  will  use (by default the program chooses
TEXT: H          either _T_S_T_E_P or (_T_S_T_O_P-_T_S_T_A_R_T)/50.0, whichever  is  smaller.
TEXT: H          _T_M_A_X  is  useful  when  one  wishes to guarantee a computing
TEXT: H          interval which is smaller than the printer increment, _T_S_T_E_P.
TEXT: H
TEXT:                GUIC H(use initial conditions)  is  an  optional  keyword
TEXT: H          which  indicates  that the user does not want SPICE to solve
TEXT: H          for the quiescent operating point before beginning the tran-
TEXT: H          sient  analysis.   If  this keyword is specified, SPICE uses
TEXT: H          the values specified using GICH=... on the various elements as
TEXT: H          the  initial  transient  condition  and  proceeds  with  the
TEXT: H          analysis.  If an G.IC Hline has been given, then the node vol-
TEXT: H          tages  on the G.IC Hline are used to compute the intitial con-
TEXT: H          ditions for the devices.  Look at the description on the
TEXT: H          IC line for its interpretation when UIC is not specified.
TEXT: 
SEEALSO: SPICE:tran

SUBJECT: op
TITLE: op
TEXT: 
TEXT:      Gop H._o_p _c_a_r_d _a_r_g_u_m_e_n_t_s
TEXT: H          Perform an operating point analysis on the current cir-
TEXT: H          cuit.  See the SPICE3 User's Guide for details.  Only
TEXT: H          available in GspiceH.
TEXT: H
TEXT: 
SEEALSO: SPICE:opanalysis

SUBJECT: analyses
TITLE: Analysis Types
TEXT: 
TEXT:                The  following  analyses  are  currently  available  in
TEXT: H          SPICE3.
TEXT: H
TEXT: 
SUBTOPIC: SPICE:acanalysis SPICE:dcanalysis SPICE:opanalysis
SUBTOPIC: SPICE:pzanalysis SPICE:trananalysis
SEEALSO: SPICE:run

SUBJECT: acanalysis
TITLE: AC Small-Signal Analysis
TEXT: 
TEXT:                The ac small-signal portion of SPICE  computes  the  ac
TEXT: H          output  variables  as  a function of frequency.  The program
TEXT: H          first computes the dc operating point  of  the  circuit  and
TEXT: H          determines  linearized,  small-signal  models for all of the
TEXT: H          nonlinear devices in the circuit.  The resultant linear cir-
TEXT: H          cuit  is  then  analyzed over a user-specified range of fre-
TEXT: H          quencies.  The desired output of an ac small-signal analysis
TEXT: H          is  usually  a  transfer  function  (voltage  gain, transim-
TEXT: H          pedance, etc).  If the circuit has only one ac input, it  is
TEXT: H          convenient  to  set  that  input to unity and zero phase, so
TEXT: H          that output variables have the same value  as  the  transfer
TEXT: H          function of the output variable with respect to the input.
TEXT: H
TEXT:           GGeneral form:
TEXT: H
TEXT:                .AC DEC H_N_D _F_S_T_A_R_T _F_S_T_O_P
TEXT: H               G.AC OCT H_N_O _F_S_T_A_R_T _F_S_T_O_P
TEXT: H               G.AC LIN H_N_P _F_S_T_A_R_T _F_S_T_O_P
TEXT: H
TEXT:           GExamples:
TEXT: H
TEXT:                .AC DEC H10 1 10K
TEXT: H               G.AC DEC H10 1K 100MEG
TEXT: H               G.AC LIN H100 1 100HZ
TEXT: H
TEXT: 
TEXT:                GDEC Hstands for decade variation, and _N_D is  the  number
TEXT: H          of  points per decade.  GOCT Hstands for octave variation, and
TEXT: H          _N_O is the number of  points  per  octave.   GLIN  Hstands  for
TEXT: H          linear variation, and _N_P is the number of points.  _F_S_T_A_R_T is
TEXT: H          the starting frequency, and _F_S_T_O_P is  the  final  frequency.
TEXT: H          If  this  line  is  included in the circuit file, SPICE will
TEXT: H          perform an ac analysis of the  circuit  over  the  specified
TEXT: H          frequency range.  Note that in order for this analysis to be
TEXT: H          meaningful, at least one independent source must  have  been
TEXT: H          specified with an ac value.
TEXT: H
TEXT: 
SEEALSO: SPICE:ac

SUBJECT: dcanalysis
TITLE: DC Analysis
TEXT: 
TEXT:                The dc analysis portion  of  SPICE  determines  the  dc
TEXT: H          operating  point  of  the circuit with inductors shorted and
TEXT: H          capacitors opened.  A dc analysis is automatically performed
TEXT: H          prior  to  a  transient  analysis to determine the transient
TEXT: H          initial conditions, and prior to an ac small-signal analysis
TEXT: H          to  determine  the  linearized, small-signal models for non-
TEXT: H          linear devices.  The dc analysis can also be  used  to  gen-
TEXT: H          erate  dc  transfer curves:  a specified independent voltage
TEXT: H          or current source is stepped over a user-specified range and
TEXT: H          the  dc  output  variables  are  stored  for each sequential
TEXT: H          source value.
TEXT: H
TEXT:           GGeneral form:
TEXT: H
TEXT:                .DC H_S_R_C_N_A_M _V_S_T_A_R_T _V_S_T_O_P _V_I_N_C_R <_S_R_C_2 _S_T_A_R_T_2 _S_T_O_P_2 _I_N_C_R_2>
TEXT: H
TEXT:           GExamples:
TEXT: H
TEXT:                .DC HVIN 0.25 5.0 0.25
TEXT: H               G.DC HVDS 0 10 .5 VGS 0 5 1
TEXT: H               G.DC HVCE 0 10 .25 IB 0 10U 1U
TEXT: H
TEXT: 
TEXT:                This line defines the  dc  transfer  curve  source  and
TEXT: H          sweep  limits.  _S_R_C_N_A_M is the name of an independent voltage
TEXT: H          or current source.  _V_S_T_A_R_T, _V_S_T_O_P, and _V_I_N_C_R are the  start-
TEXT: H          ing, final, and incrementing values respectively.  The first
TEXT: H          example will cause the value of the voltage source _V_I_N to be
TEXT: H          swept  from  0.25  Volts  to 5.0 Volts in increments of 0.25
TEXT: H          Volts.  A second source (_S_R_C_2) may optionally  be  specified
TEXT: H          with  associated  sweep parameters.  In this case, the first
TEXT: H          source will be swept over its range for each  value  of  the
TEXT: H          second source.  This option can be useful for obtaining sem-
TEXT: H          iconductor device output characteristics.   See  the  second
TEXT: H          example circuit in the GExamples Hsection of the guide.
TEXT: H
TEXT: 
SEEALSO: SPICE:dc

SUBJECT: opanalysis
TITLE: Operating Point
TEXT: 
TEXT:           GGeneral form:
TEXT: H
TEXT:                .OP
TEXT: H
TEXT: 
TEXT:                HThe inclusion of this line in an input file will  force
TEXT: H          SPICE  to  determine  the  dc operating point of the circuit
TEXT: H          with inductors shorted and capacitors opened.  Note:   a  dc
TEXT: H          analysis  is  automatically  performed  prior to a transient
TEXT: H          analysis to determine the transient initial conditions,  and
TEXT: H          prior  to  an  ac  small-signal  analysis  to  determine the
TEXT: H          linearized, small-signal models for nonlinear devices.
TEXT: H
TEXT:                SPICE performs a dc  operating  point  analysis  if  no
TEXT: H          other analyses are requested.
TEXT: H
TEXT: 
SEEALSO: SPICE:op

SUBJECT: pzanalysis
TITLE: Pole-Zero Analysis
TEXT: 
TEXT:                The pole-zero analysis portion of  SPICE  computes  the
TEXT: H          poles and/or zeros in the small-signal ac transfer function.
TEXT: H          The program first computes the dc operating point  and  then
TEXT: H          determines  the  linearized, small-signal models for all the
TEXT: H          nonlinear devices in the circuit. This circuit is then  used
TEXT: H          to find the poles and zeros.
TEXT: H
TEXT:                Two types of transfer functions are allowed: one of the
TEXT: H          form  (output  voltage)/(input voltage) and the other of the
TEXT: H          form (output voltage)/(input current).  These two  types  of
TEXT: H          transfer  functions cover all the cases and one can find the
TEXT: H          poles/zeros of functions  like  input/output  impedance  and
TEXT: H          voltage  gain.   The input and output ports are specified as
TEXT: H          two pairs of nodes.
TEXT: H
TEXT:                The pole-zero analysis works  with  resistors,  capaci-
TEXT: H          tors,   inductors,  linear-controlled  sources,  independent
TEXT: H          sources, BJTs,  MOSFETs,  JFETs  and  diodes.   Transmission
TEXT: H          lines are not supported.
TEXT: H
TEXT:           GGeneral forms:
TEXT: H
TEXT:                 .PZ H_N_O_D_E_1 _N_O_D_E_2 _N_O_D_E_3 _N_O_D_E_4 _C_U_R _P_O_L
TEXT: H                G.PZ H_N_O_D_E_1 _N_O_D_E_2 _N_O_D_E_3 _N_O_D_E_4 _C_U_R _Z_E_R
TEXT: H                G.PZ H_N_O_D_E_1 _N_O_D_E_2 _N_O_D_E_3 _N_O_D_E_4 _C_U_R _P_Z
TEXT: H                G.PZ H_N_O_D_E_1 _N_O_D_E_2 _N_O_D_E_3 _N_O_D_E_4 _V_O_L _P_O_L
TEXT: H                G.PZ H_N_O_D_E_1 _N_O_D_E_2 _N_O_D_E_3 _N_O_D_E_4 _V_O_L _Z_E_R
TEXT: H                G.PZ H_N_O_D_E_1 _N_O_D_E_2 _N_O_D_E_3 _N_O_D_E_4 _V_O_L _P_Z
TEXT: H
TEXT:           GExamples:
TEXT: H
TEXT:                .PZ 1 0 3 0 CUR POL
TEXT: H               .PZ 2 3 5 0 VOL ZER
TEXT: H               .PZ 4 1 4 1 CUR PZ
TEXT: H
TEXT: