6.301  Solid-State Circuits

Dear Class,

All the practice final exam solutions are realeased online now.  Please let us know if you have any question.

Good luck on your exam!

I will be holding an informal review session on Thursday from 3 to 5 in 38-500.

For Problems 2 and 3 of Problem Set 6, use Bode plot instead of Nyquist diagram. Use asymtotes (straight lines) for magnitude. For phase, analytically calculate phases at 1MHz and 4MHz, and linearly interpolate (on Bode plot) in between.

My Signups for Lab 2 are online in the forum.

Doug

When modeling the transistors in spice, you can use the 2n3904 built in to LTspice, or if you want to be more precise, you can add your own model.

The syntax is:
 

Model statement:

in which BF is the common emitter current gain ß, IS is the saturation current and VAF is the Early voltage. If no values are specified, the default values are assumed (ß=100; IS=1E-16A, and VAF=[infinite]). Other parameters can be specified including the junction capacitances CJE (0pF) and CJC (0pF), the transit times TT (0sec) and TR (0sec), the base RB (0 Ohm), emitter RE (0 Ohm) and collector resistances RC (0 Ohm). For a complete list of the parameters please refer to one of the references. As an example, the model parameters for the 2N2222A NPN transistor is given below:
 
  Notice that the continuation sign + should be added at the beginning of a new line. A circuit example with a npn transistor can be found under the section Examples