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Introduction
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X5 4 7 6 5 NAND31875 1 X6 5 10 3 6 NAND31875 0 X7 11 4 INV1875 X8 12 3 INV1875 .ENDS FFLOP1875
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.SUBCKT NAND31875 0 1 2 3 4 Nand Gate with 0V initial output voltage, Node 4 E1 5 0 VALUE = {IF ((V(1) > 800mV) & (V(2) > 800mV) & (V(3) > 800mV), 0, 5)} R1 5 4 40 C1 4 0 50P IC = 0 .ENDS NAND31875 0
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.SUBCKT NAND31875 1 1 2 3 4 Nand Gate with 5V initial output voltage, Node 4 E1 5 0 VALUE = {IF ((V(1) > 800mV) & (V(2) > 800mV) & (V(3) > 800mV), 0, 5 )} R1 5 4 40 C1 4 0 50P IC = 5 .ENDS NAND31875 1
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.SUBCKT INV1875 1 2 E1 3 0 VALUE = {IF (V(1) > 800mV, 0, 5)} R1 3 2 10 C1 2 0 20P IC = 5 .ENDS INV1875 PSpice Example Nand Netlist Using Math Equations .SUBCKT X gate A B out R1 A B 1meg E1 3 0 Value = {(1 + tanh(1000 (1.5 v(A)))) (1 + tanh(1000 (1.5 v(B))))} R2 3 4 1 C1 4 0 1n .ENDS
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Switch Elements (S/W Elements) Switches are a key part of most power electronics simulations. Switches are frequently used to replace a semiconductor in order to speed the simulation. PSpice includes three different switches whose characteristics make them suitable for different applications. One of the most frequently used is the switch with hysteresis. If your simulator supports all the standard Berkeley SPICE 3 elements, then this switch can be used without any syntax changes. This type of switch has only recently been included as a primitive element in PSpice.
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SPICE 3 syntax
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Format: Format:
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Sname N + N NC + NC modelname [ON] [OFF] Wname N + N vname modelname [ON] [OFF]
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Example:
Example:
S1 1 2 3 4 switch1 .Model switch1 SW Ron = 0.1 Roff = 1G Vt = 1 Vh = .5 W1 1 2 Vsense switch1 .Model switch1 CSW H Ron = 1m Roff = 1G It = 1 Ih = .5
The SPICE 3 voltage-controlled switch begins with the letter S. N+ and N represent the connections to the switch terminals. The nodes NC+ and NC are the positive- and negative-controlling nodes, respectively. The device s model name (modelname) is mandatory, while the initial conditions are optional. ON or OFF specify the switch state for the DC operating point calculation. The current-controlled switch begins with the letter W, and the statement names a voltage source whose current is used to control the switch. Otherwise the model parameters and operation are the same. The switch requires a .Model statement in order to describe the switch characteristics. The model type parameter must be SW. Ron is the on resistance, Roff is the off resistance, Vt is the threshold voltage, and Vh is the hysteresis voltage. In PSpice, the type of switch, either with hysteresis or with a smooth transition region, is determined by the model parameters used in the .Model statement. The settings for the PSpice switch with hysteresis are explained below.
PSpice syntax switch with hysteresis
Format: Format: Example:
Sname N + N NC + NC modelname Wname N + N vname modelname
S1 1 2 3 4 switch1 .Model switch1 VSWITCH Ron = 1m Roff = 1G Vt = 1 Vh = .5 Example: W1 1 2 3 4 switch1 .Model switch1 ISWITCH Ron = 0.1m Roff = 1G It = 1 Ih = .5 In older versions of PSpice, the switch with hysteresis is not available. Instead a subcircuit representation can be used to create this function. Passed parameters replace the model parameters.
PSpice subcircuit syntax switch with hysteresis
.Subckt SWhyste NodeMinus NodePlus Plus Minus PARAMS: + RON = 1 ROFF = 100MEG VT = 1.5 VH = .5
Introduction
S5 NodePlus NodeMinus 8 0 smoothSW EBcrtl 8 0 Value = {IF (V(plus) V(minus) > V(ref), 1, 0 )} EBref ref1 0 Value = {IF (V(8) > 0.5, {VT VH}, {VT + VH})} Rdel ref1 ref 70 Cdel ref 0 100p IC = {VT + VH} Rconv1 8 0 10Meg Rconv2 plus 0 10Meg Rconv3 minus 0 10Meg .Model smoothSW VSWITCH (RON = {RON} ROFF = {ROFF} + VON = 1 VOFF = 0) .Ends SWhyste
The switch model allows an almost ideal switch to be described in PSpice. The switch is not quite ideal; the resistance cannot change from zero to in nity, but must always have a nite positive value. If the on and off resistances are selected properly, they can be effectively zero and in nity in comparison to other circuit impedances. The switch has hysteresis, which is described by the Vh parameter. For example, the voltage-controlled switch will be in the on state, with a resistance, Ron, at Vt + Vh. The switch will be in the off state, with a resistance, Roff, at Vt Vh. The use of an ideal element that is highly nonlinear, such as a switch, can cause large discontinuities to occur in the circuit node voltages. The rapid impedance change, which is associated with a switch that is changing state, can cause numerical roundoff or convergence problems. This leads to erroneous results or timestep dif culties. Consequently, the following steps may be taken to improve the switch behavior: Set the switch impedances to values that are only high and low enough to be negligible with respect to other elements in the circuit. Using switch impedances that are close to ideal under all circumstances will aggravate the discontinuity problem. Of course, when modeling real devices such as MOSFETs, the on resistance should be adjusted to a realistic level, which depends on the size of the device that is being modeled. If a wide range of on to off resistance must be used (ROFF/ RON > 1E + 12), then the tolerance on errors allowed during the transient analysis should be decreased. This is achieved by specifying the .OPTION TRTOL parameter to be less than the default value of 7.0. When switches are placed around capacitors, the .OPTION CHGTOL parameters should also be reduced. Suggested values for these two options are 1.0 and 1E 16, respectively. These changes inform PSpice to be more careful near the switch points, so no errors are made because of the rapid change in the circuit response.
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