Compare the performance of an amplifier with an npn  circuit to one with a pnp circuit. The npn has B = 300 and VA = 100V while the pnp has ß = 200  and VA = 100V. 

(a) In each circuit, find the required resistance to achieve a Q point of Q(3.0V,  3.0mA).

(b) calculate the power dissipated by the npn and the pnp circuits. 

(c) Calculate the gain,  vo/vi, when each circuit is inserted into the amplifier. 

(d) Simulate each case using LTspice. 

Usean input amplitude vi = 10mV at a 10kHz frequency and plot a suitable transient plot of theoutput. Use this result to find the gain and compare this with your hand calculation. 

 

vi Vbb=4V Rb Ri 1k Vcc=9V Rc npn circuit 5 47F NPN 2N3904 npn or pnp circuit Figure 1.14 C 47F Vbb=4V Rb' RL 1k vo Vee=9V PNP 2N3906 pnp circuit Rc'