Thanks for advice but I told you that I am a newbie in electronics although I study it at school.
I have to do a modulation of a sine wave(100KHz) with bits coming from a uC like i said.(where is "1" there will be a presence of the sine , where is "0" there will be an absence of the sine....isn't it good ?)
I am not constrained to use ASK , but i believe it's the easiest possible type.
I must tell you that i want the receiver to use bandpass filtering to extract the signal not a kind of complex demodulator.
Thanks.