BJT output of CE configuration
If you want a low distortion output i.e. an output &quot;shape&quot; that significantly matches your input voltage waveform you will fall-short without several things: -

An emitter resistor to linearize the base-emitter junction
Moderate signal amplitude because large amplitudes will usually show much more distortion
Negative feedback (you might not be at that point in your learning yet)


If i want an amplified signal at the output must I use a current
signal ? Not a voltage signal?

A current signal helps but this can be largely overcome by using an emitter degeneration resistor: -

This table from the wiki page describes the formulas involved both with, and without, the emitter degeneration resistor: -