show PSpice circuit schematic of inverter circuit with BJT (Q2N3904) from figure 5-5 but use only current input Ib to B gate, run a primary DC sweep for Vcc (0 to 10V) and secondary sweep for Ib (0 to 100uA), plot VI curve (Vc-Ve x-axis & Ic y-axis).
run a new DC sweep (primary and secondary) of the above circuit after changing Rc value from 1K to 2K, plot VI curve similarly and trace on the same graph the load line equation 5-2, show on the plot where the three different regions, give the ranges for the base current for each region.
calculate Rb from ib=(Vin-Vf)/Rb (Vf=0.6V) to make transistor work in the digital regime when 0-5V square wave is applied as input to inverter.
calculate Rb from ib=(Vin-Vf-IcRc)/(Rb+Rc) (Vf=0.6V and obtain ic from VI curve for Vce=7V) to make transistor work in the digital regime when 0-5V square wave is applied as input to voltage follower.
for both BJT circuits run primary DC sweep for Vcc (0-5V) using the computed Rb values, plot input output characteristic curve and identify the three regions.
run transient analysis with square wave input (0-5V), plot Vout, show on and off levels.
from procedure:
plot the VI characteristic for the BJT with 1K or 2K resistor obtained using "BJT_iv_curve.vi".
plot the VI characteristic for the led with 1Kresistor obtained using "iv_curve.vi".
plot the output waveform for both BJT inverter and voltage follower circuits in figure 5-11 captured from oscilloscope using scopegrab.vi, show rms, ppk and avg values.
from analysis:
explain the main difference between an inverter and a voltage follower.
2)JFET:
from preparation:
show PSpice circuit schematic of inverter circuit with JFET (J2N3819) from figure 5-10, run a primary DC sweep for Vdd (0 to 10V) and secondary sweep for VGS (-2.5 to 0V), plot VI curve (Vd x-axis & Id y-axis).
run a new DC sweep (primary and secondary) of the above circuit after changing Rc value from 1K to 2K, plot VI curve similarly and trace on the same graph the load line equation 5-5, show on the plot where the three different regions, give the ranges for the gate-source voltage for each region.
plot the input output voltage characteristic, show the three different regions.
run transient analysis with square wave input (-5V-0V), plot Vout, show on and off levels.
from procedure:
plot the VI characteristic for the BJT obtained using "FET_iv_curve.vi".
plot the output waveform for both JFET inverter and voltage follower circuits in figure 5-11 captured from oscilloscope using scopegrab.vi, show rms, ppk and avg values.
from analysis:
explain what transistor (BJT or JFET) is better suited as a switch.
explain if the JFET will reach the triode region if 0.5K resistor replaced both LED and 1K resistor.
