Single Supply

[Op04]

I see almost all detector schematic using dual supply. What if I use single battery say a single 18V battery just to meet opamp needed voltage and the supply rail, which supplied by charge pump can replaced by using 18V battery mentioned. Or is it related to signal phase? AC signal is there, but is it there is no other way to make fully single supply? So then it must only works by use dual supply? If using the 18V and put simple voltage divider by 2 resistor, is that option will do?? replacing charge pump for negative rail.
Hope my english understood, I still lack electronic understanding. Thanks anyone for enlightenment.

[Carl-NC]

Are you talking about VLF or PI? Most commercial VLF use 5V for analog and a rail splitter to create the "analog ground" (2.5V). They can run on just about any battery pack, from 1.5V to 12V, by using a buck or boost converter.

Many PI designs use a charge pump to create analog VCC (usually 5V) because of the quirky way the battery is connected to the TX driver. You can avoid this by either AC-coupling the coil signal to the preamp or by using a bipolar TX driver.

[Op04]

Oh sorry Mr. Carl, I'm talk about VLF. I want to omit charge pump. What is the alternative for best clean / balance ground plane from single supply?

[Op04]

I think I just solved my needs, you've point me a hint word, rail splitter that'is. Thank you so very much Chief for quick response..
Regards