Hi
I need to create a few low disturbance voltages to use with a analog video decoder. I need one 3.3V for digital circuitry, one 3.3V for analog, one 1.8V for digital and one 1.8V to drive a PLL. I want thous voltages to have separate GND from the rest of the circuit, one for digital and one for analog circuitry.
I believe it will be sufficient to use ferrite beads to "isolate" these voltages from the main voltage and GND, but I'm not sure which characteristics the ferrite beads need to have.
There are no particular frequencies that I'm aware that I need to filter. The main 5V is created from a 850KHz DC/DC step down switcher though.
I'm not sure about the current consumption of the four voltages, but it can be assumed to be less than 40mA each, and less than 100mA in total.
Price is a factor of course, but also the size is fairly important. I would also much prefer SMD components.
I guess I need fairly low impedance components, but otherwise I'm not sure what to look for.
Does anyone have any components to recommend, or at least some general hints? All help is much appreciated.
Kind regards
Albin, Sweden