PSpice Application Notes

PSpice App Note_Obtaining Steady State of High-Q Circuits Using Open Loop Response

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APPLICATION NOTE 3 Calculating the Total Loop Gain Once the voltage gain and the current gain are calculated, the total loop gain can be determined by the following relation: 1/T+1 = 1/Ti+1 + 1/Tv+1 Therefore, T=((Ti+1)||(Tv+1)) - 1 where x||y = 1/(1/x + 1/y) = xy/(x+y) Figure 1: Symbol Graphic The symbol contains the attribute VOLTS = 0. This parameter is used to pass the value of a global parameter to the subcircuit. In the example circuit, the global parameter ACVAL is defined and the attribute value of VOLTS is set to {ACVAL}. If a parameter value is not passed to the subcircuit, the default value for VOLTS is then 0. The template for the symbol is as follows (as a single line): X^@REFDES %A %B @MODEL PARAMS: ?VOLTS|VOLTS=@VOLTS||VOLTS=0|

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