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- _S_i_g_n_i_f_i_c_a_n_t _c_h_a_n_g_e_s _s_i_n_c_e _S_P_I_C_E_3_A_5
- December 13, 1985
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- T. Quarles
- A.R.Newton, D.O.Pederson, A.Sangiovanni-Vincentelli
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- Department of Electrical Engineering and Computer Sciences
- University of California
- Berkeley, Ca., 94720
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- _1. _N_e_w _f_e_a_t_u_r_e_s
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- o+ In SPICE3A6 we have introduced two new devices, the voltage
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- controlled switch and the current controlled switch. These
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- switches allow a controlling voltage or current to switch
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- the resistance between two nodes from a very large value to
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- a very small value.
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- o+ The SPICE front end interface has been expanded to recognize
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- and process the .PRINT and .PLOT cards from SPICE2 which
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- were previously ignored.
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- _2. _E_n_h_a_n_c_e_m_e_n_t_s
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- o+ The MOS level 1 model code has been rearranged and optim-
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- ized, resulting in a significant speed improvement. As a
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- part of this optimization, the default value of MJSW, the
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- junction sidewall grading coefficient was changed from .33
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- to .5.
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- 2
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- o+ The transient analysis routine has been modified so that it
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- is now interruptable when running the interactive version of
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- SPICE.
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- _3. _C_h_a_n_g_e_s
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- o+ The front end 'end' command has been changed to 'reset' to
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- prevent confusion with the SPICE2 .END command.
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- _4. _F_i_x_e_s
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- o+ A problem causing errors during subcircuit expansion with
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- models has been fixed.
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- o+ Parsing problems with .IC, .NODESET, and JFET cards have
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- been fixed.
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- o+ Mosfet models now correctly handle the XJ parameter.
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- o+ Several assignments which caused the 'UIC' flag to be lost
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- have been fixed
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- o+ In a level 2 or level 3 MOSFET, a problem with preprocessing
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- of certain parameters when TOX was not specified has been
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- fixed.
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- o+ A divide by zero error during AC analaysis of mosfets when
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- no resistance was specified has been fixed.
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- o+ A rounding error problem which could cause pulse sources to
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- stop setting breakpoints has been fixed.
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