Please do look into it . URGENT

[abishek007]

Hi ALL ,
I will appreciate if i can get some help regarding this topic .
I am working on my final masters project ( PLL )and i want my loop filter output
to vary from 1.8 to 3.6 volts ( circuit req ) . But my VDD of the circuit is 1.8
i was wondering what can i do so that my signal from loop filter varies from 1.8 to 3.6 V

Thanks

 

[arunkumar446]

you can use a charge pump to double the voltage, but loading thing is to be taken care of.