Contents
What are the different types of MOSFETs In LTspice?
M. MOSFET. Symbol Names: NMOS, NMOS3, PMOS, PMOS3There are two fundamentally different types of MOSFETS in LTspice, monolithic MOSFETs and a new vertical double diffused power MOSFET model. Monolithic MOSFET:
How to add sic models to LTspice schematic?
The previous article explained how to incorporate Wolfspeed’s silicon carbide (SiC) MOSFET models into LTspice and then how to add a specific device to a schematic.
Is the optional temp value valid for Level 4 MOSFETs?
The optional TEMP value is the temperature at which this device is to operate, and overrides the temperature specification on the .OPTION control line. The temperature specification is ONLY valid for level 1, 2, 3, and 6 MOSFETs, not for level 4, 5 or 8 BSIM devices.
How does LTspice help in hot swap circuit design?
Often the most challenging aspect of Hot Swap™ circuit design is verifying that a MOSFET’s Safe Operating Area (SOA) is not exceeded. The SOAtherm tool distributed with LTspice IV ® simplifies this task, allowing a circuit designer to immediately evaluate the SOA requirements of an application and the suitability of the chosen N-channel MOSFET.
How are NMOS and PMOS MOSFETs described in spice?
Fig. 5.1: Spice element description for the NMOS and PMOS MOSFETs. Also listed is the general form of the associated MOSFET model statement. A partial listing of the parameter values applicable to either the NMOS or PMOS MOSFET is given in Table 5.1.
Which is the SPICE model for an n-channel MOSFET?
The general form of the DC Spice model for an n-channel MOSFET is illustrated schematically in Fig. 5.2. The bulk resistance of both the drain and source regions of the MOSFET are lumped into two linear resistances r D and r S, respectively.
How is LTspice used to simulate field effect transistors?
In this chapter we shall show how LTSpice is used to simulate circuits containing field-effect transistors (FETs). LTSpice has built-in models for two of the three FET types considered here, metal-oxide-semiconductor FETs (MOSFETs) and junction FETs (JFETs).
Where did the code for LTspice come from?
9 BSIMSOI3.2 (Silicon on insulator) from the BSIM Research Group of the University of California, Berkeley, February 2004. 12 EKV 2.6 based on code from Ecole Polytechnique Federale de Lausanne.
Is the node Vin In LTspice a floating node?
WARNING: Node VIN is floating. WARNING: Node N002 is floating. WARNING: Less than two connections to node VIN. This node is used by M1. WARNING: Less than two connections to node N002.
How to set a ramp voltage In LTspice?
You can set a ramp voltage in LTspice like this: PULSE (0 1 0 {0.99/f} {0.01/f} 0 {1/f}) which is a ramp from 0 to 1V, with period given by the frequency f. You could have used {1/f} for rise time and zero for fall and Ton, but that setting can have adverse effects in the dynamic range in long runs.
What happens when LTspice says time step too small?
FYI, when LTspice points out a node or element in a “timestep too small” error, it turns out that it is usually meaningless. It might have nothing to do with the node or element called out. You could try with Alternate solver.
What are the four terminal devices of a MOSFET?
Monolithic MOSFETS are four terminal devices. Nd, Ng, NS, and Nb are the drain, gate, source, and bulk; i.e., substrate; nodes. L and W are the channel length and width, in meters. AD and AS are the areas of the drain and source diffusions, in square meters.
What is the keyword for a monolithic MOSFET?
The model card keywords NMOS and PMOS specify a monolithic N- or P- channel MOSFET transistor. The model card keyword VDMOS specifies a vertical double diffused power MOSFET. Monolithic MOSFETS are four terminal devices. Nd, Ng, NS, and Nb are the drain, gate, source, and bulk; i.e., substrate; nodes.