EEL3304: SPICE 2 Assignment

As in your first spice assignment, design a single-transistor amplifier that provides a nominal midband gain of 10 (within 5%) when driving a load resistance of 5k . Assume a source resistance of 5k . You may use a 15-Volt power supply ( 15V) and a single Q2N222 transistor. You must use resistors with standard values (see appendix F in Sedra & Smith ). Only use capacitor values in the range 1 F to 10 F. Your design goal is to maximize the bandwidth of your amplifier at standard room temperature (27 C). Use the microsim PSPICE model for the Q2N2222 npn transistor for all of your simulations:

.model Q2N2222  NPN(Is=14.34f Xti=3 Eg=1.11 Vaf=74.03 BF=255.9 Ne=1.307
+		Ise=14.34f Ikf=.2847 Xtb=1.5 Br=6.092 Nc=2 Isc=0 Ikr=0 Rc=1
+		Cjc=7.306p Mjc=.3416 Vjc=.75 Fc=.5 Cje=22.01p Mje=.377 Vje=.75
+		Tr=46.91n Tf=411.1p Itf=.6 Vtf=1.7 Xtf=3 Rb=10)

You must hand in each of the following parts:

1. A summary sheet showing your final hand calculated and spice values for midband gain, , and . Use the spice generated small signal values for your hand calculations. (A blank sheet will be provided to you in class)
2. Briefly describe your design process, i.e. how you decided which amplifier configuration to use, how you went about setting the component values, etc.
3. Hand in a frequency plot from probe that clearly shows the midband gain, , and (in Hz).
4. AC analysis: Derive the expressions for gain midband gain ( ), , and using the small signal values generated from spice. Calculate the % error from the spice determined values.