Parameters: Bf: Forward beta coefficient (default value = 50) Br: Reverse beta coefficient (default value = 0.1) Is: Transport saturation current (default value = 1e-16 Amp) Vak: Inverse early voltage (default value = 0.02 /Volt) Tauf: Ideal forward transit time (default value = 0.12e-9 sec) Taur: Ideal reverse transit time (default value = 5e-9 sec) NF: Forward current emission coefficient (default value = 1) NR: Reverse current emission coefficient (default value = 1) Ccs: Collector-substrate capacitance (default value = 1e-12 F) Cje: Base-emitter zero bias depletion capacitance (default value = 0.4e-12 F) Cjc: Base-collector zero bias depletion capacitance (default value = 0.5e-12 F) Phie: Base-emitter diffusion voltage (default value = 0.8 Volt) Me: Base-emitter gradation exponent (default value = 0.4) Phic: Base-collector diffusion voltage (default value = 0.8 Volt) Mc: Base-collector gradation exponent (default value = 0.333) EG: Energy gap for temperature effect on saturation current (default value = 1.11 Volt) XTI: Saturation current temperature exponent (default value = 3) XTB: Forward and reverse beta temperature coefficient (default value = 0) Gbc: Base-collector leakage conductance (default value = 1e-15 Mho) Gbe: Base-emitter leakage conductance (default value = 1e-15 Mho) EMin: Minimum exponent (default value = -100) EMax: Maximum exponent (default value = 40)
References:
Vlach, J. and K. Singal (1983), Computer methods for circuit analysis and design, Van Nostrand Reinhold, New York, on page 317 ff.