ceramic capacitors with electrolytic capacitor

[balamanikandan]

hi,

" If the circuit to be bypassed generates large current pulses (like the power switch), more capacitance is required. A good choice would be an aluminum electrolytic bypassed with a film and ceramic capacitor"

here, what is the role of ceramic capacitor?


Please clarify .

 

[emontllo]

Adding various capacitor technologies and values in parallel improves performance in a wider range of frequencies. Ceramic capacitors have low ESR and ESL and therefore they provide low impedance at high frequency where aluminum electrolytic do not.