The gain of a common emitter stage is approx. equal to:
` Zc/Ze
` Where
` Zc = the collector impedance (Cllector resistor in parallel with the
` load impedance)
` Ze = the emitter impedance
` With no capacitor, Ze = Re (approximately)
` With a capacitor, Ze = Re in parallel with the capcaitive reactance, so
` the lower the capacitive reactance at the frequency of interest,
` the higher the gain.
`
' Keep in mind that the lower the value of Zc, the lower the value of the
` input impedance to the amplifier stage. The input imepdance is approx
` equal to Ze X Beta, where Beta is the current gain of the transistor.