Contents
What are the ohmic resistances of the Spice BJT?
The Spice BJT model is illustrated schematically in Fig. 4.2. The ohmic resistances of the base, collector, and emitter regions of the BJT are lumped into three linear resistances r B, r C and r E , respectively.
How many parameters are associated with the SPICE model?
The number of parameters associated with the Spice model of the BJT is rather large (40 in total), and their individual meanings are rather involved.
How to describe BJTs to spice-McGill University?
A partial listing of the parameters associated with the Spice BJT model under static conditions is given in Table 4.1. Also listed are the associated default values; if the value of a particular parameter is not specified on the .MODEL statement, the parameter assumes its default value.
How to describe a bipolar junction transistor ( BJT ) to spice?
In this chapter on the bipolar junction transistor (BJT) we shall proceed in a similar fashion, first outlining the two statements that are required to describe a BJT to Spice. This will then be followed by a brief description of the model used to represent the BJT within Spice.
How to calculate collector current and voltage In LTspice?
Fig. 4.4: The LTSpice generated circuit netlist for calculating the collector current and voltage of the transistor circuit shown in Fig. 4.3. Assuming the nodes of the circuit are labeled as shown in Fig. 4.3, the corresponding LTSpice generated netlist (with some rearrangements) is listed in Fig. 4.4.
What kind of circuits can be simulated In LTspice?
The types of circuits that will be simulated will range from single npn and pnp transistor amplifiers to multiple-transistor amplifier circuits, as well as circuits that utilize the transistor as an on-off switch. Two statements are required to describe any particular semiconductor device to LTSpice.