Two typos in BJT quirks. If two identical power transistors were paralleled for higher current, one would expect them to share current equally. Because of differences in characteristerics, transistors do not hasre current equally. Probably should be "shared". The solution to the junction capacitance problem is to select a high frequency transistor for wide bandwidth applications RF (radio frequency) or microwave transistor. The bandwidth can be extended further by using the common-base instead of the common=emitter configuration. The grounded base shields the emitter input from capacitive collector feedback. A two-transistor cascode arrangement will yield the same bandwidth as the common-base, with the higher input impedance of the common-emitter. Needs "-" rather than "="