C_(L) d(v_(OUT))/(d)t=
1.9\times 10^(6)(V)/(s) is required of the circuit in Figure 4.1 , which sets a
minimum collector current, I_(C). Using the relation Q=C_(L)v_(our ), show that
the required DC collector current is I_(C)=3.8mA when C_(L)=2nF to meet
this requirement.
Hint: Assume C_(L) is being discharged by I_(C) as shown in Figure 4.2
(b) For the circuit in Figure 4.1, calculate the value of the resistor R_(C) to
ensure that the DC output voltage V_(ovr) is given by (V_(S))/(2) where the supply
voltage, V_(S)=15V.
(c) Setting the emitter resistor R_(E)=(R_(C))/(2), calculate the DC base voltage, V_(B),
when V_(BE)=0.7V and the BJT amplifier gain of \beta =150. Assume that the
BJT device operates in the forward active region.
(d) Assuming the collector current of I_(C)=3.8mA as stated in part (a),
calculate the DC base current, I_(B). Calculate the required voltage at the
node labeled V_(x) to maintain a base resistor R_(B)=216.5k\Omega .
(e) State the criteria on selecting the values of R_(1) and R_(2) compared to the
resistor R_(B). Clearly stating any necessary assumptions, suggest suitable
values for R_(1) and R_(2) to establish the collector current of part (d).
