[time-nuts] Re: dual supplies Re: Re: DIY Low offset Phase Noise Analyzer (Erik Kaashoek)

[Richard (Rick) Karlquist]

On 7/10/2022 10:14 AM, Lux, Jim via time-nuts wrote:
> 
> Yeah, but that virtual ground brings with it it's own set of problems. 
> For instance, it has to both sink and source current, so you can't just 
> use a 3 terminal regulator to create the midpoint, although I've seen 
> schemes with a resistor from virtual ground to negative supply, but 
> that's not very power efficient - the resistor needs to see, say, 10x 
> the maximum sink current.
> 

You might look at the LT1118-2.85 "Supply Splitter".  It is able to do
either sink or source, as needed, unlike an ordinary regulator.

Rick N6RK