Hi Ioannis
I made a trial efforts with 74HC4046 for realization of 11 time multiplying of input frequency from 1 Hz to 1 MHz.The output such have to be from 11 Hz to 11 MHz.But it is very tricky especially because many frequency operating bands are needed to cover the whole frequency range.(means lot of VCO center frequencies and lot of filters have to switched ON and OFF for each band of frequency lock range.)
Please what do you mean with your question to me in your previous reply : "are OK with 2MHz? "
What solution do you have for 2 MHz frequency range ?
Mike