what iS IRC oscillator ?

[aravindpb5009]

hai

              please explain me briefly  about IRC oscillator  and  difference b/w IRC oscillator and system oscillator 

,on which time need  to powered up the IRC oscillator let me know the solution if any body knows

thanks& regards 

Aravind P

[xiangjun_rong]

Hi, Aravind,

Generally, the IRC is a circuit which consists of adjustable current source, capacitor and comparator, the current source charges/discharges the capacitor, which make the capacitor voltage rising or falling, the voltage is connected to a comparator, the comparator can output square-wave signal as clock signal. The output current  of  current source can be adjusted so we can trim the clock frequency.

But the circuit is confidential, we have not any documentation open to public.

BR

XiangJun Rong