B.9. Signal or Incremental Common-Emitter Current Gain
Since βDC/IB is a variable function of IC, the incremental βac is, in general, different from the dc βDC. (The incremental βac is often referred to as βo, but βac is consistent with SPICE.) To get an approximate value, we could calculate βac from
Equation B.42
with IC1 = IC2 and where (B.39) is used to obtain βDC at the two currents. The definition of βac is from the limiting case of IC2 → IC1, that is,
Equation B.43
Performing this operation with the use of (B.39) leads to
Equation ...
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