To meet given amplifier specifications two or more stages are cascaded in series, each stage can be identical or different. Such amplifiers are called cascade amplifiers. Often amplifier with common emitter multi stages is referred to as Cascade amplifier.
Cascade amplifier is a Common base amplifier stage in cascade with common emitter stage. It combines the high resistance, large Transconductance (high gain) achieved in common emitter amplifier with the superior high frequency response of common base amplifier. It is designed to achieve wider bandwidth but dc gain approximately equal o that of common emitter amplifier.