


SPICEMOD(3ICD)		     1/16/88		   SPICEMOD(3ICD)



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     spicemod - process file for spice models

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     The file _s_p_i_c_e_m_o_d contains information that is used by
     _x_s_p_i_c_e when a SPICE circuit description is extracted from
     the database and when the option '-m' is used.  The first
     part of _s_p_i_c_e_m_o_d describes how a transistor in the database
     should be renamed in the SPICE circuit description and with
     which value the (layout-specified) transistor width and
     length should be decreased to gain the transistor width and
     length that is appropriate for the SPICE model used.  The
     second part of _s_p_i_c_e_m_o_d, (after the '%' sign) contains the
     information that is added after the extracted circuit
     description.  This part may contain the transistor model
     descriptions.  Another possibility to specify the transistor
     models for the circuit that is extracted from the database
     with _x_s_p_i_c_e is by using the program _p_u_t_d_e_v_m_o_d.

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     Below an example of a spicemod file for a NMOS process is
     given.

     # nmos process TU Delft

     nenh    nenhs   0.88e-6   0
     ndep    deps    1.20e-6   0

     %

     * parameters for depletion NMOS  w/l = 4/4
     .model deps nmos	   level=2
     +			   vto=-3.971	  kp=31.54u	 gamma=0.3642
     +			   phi=0.578	  pb=0.84	 cgso=430p
     +			   cgdo=430p	  cgbo=130p	 rsh=25.3
     +			   cj=62u	  mj=0.73	 cjsw=340p
     +			   mjsw=0.20	  js=6.2u	 tox=0.07u
     +			   xj=0.35u	  ld=0.605u	 uo=640
     +			   ucrit=5340	  uexp=-0.025	 utra=0
     +			   xqc=0.5	  fc=0.6	 lambda=0.0258
     +			   vmax=3.5e4	  nsub=9.8e14
     +			   delta=6.3
     * end deps w/l = 4/4

     * parameters for n_enhancement NMOS  w/l = 4/4
     .model nenhs nmos	   level=2
     +			   vto=0.6838	  kp=32u	 gamma=0.2787
     +			   phi=0.55	  pb=0.84	 cgso=440p
     +			   cgdo=440p	  cgbo=100p	 rsh=25.3
     +			   cj=62u	  mj=0.73	 cjsw=340p
     +			   mjsw =0.20	  js=6.2u	 tox=0.07u
     +			   xj=0.35u	  ld=0.625u	 uo=650



		   The Nelsis IC Design System			1






SPICEMOD(3ICD)		     1/16/88		   SPICEMOD(3ICD)



     +			   ucrit=1430	  uexp=0.154	 utra=0
     +			   xqc=0.5	  fc=0.6	 lambda=0.02269
     +			   vmax=6e4	  nsub=5.71e14
     +			   delta=5.5
     * end nenh w/l = 4/4

     vpbulk 1 0 5V
     rpbulk 1 0 100meg
     vnbulk 2 0 -2.5V
     rnbulk 2 0 100meg

     * vdd ? 0 5V
     * rgnd ? 0 1p
     * rvss ? 0 1p


AAAAUUUUTTTTHHHHOOOORRRR
     A.J. van Genderen

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     spice, xspice(1ICD), putdevmod(1ICD).


































2		   The Nelsis IC Design System



