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

[Bob kb8tq]

Hi

I seem to recall TI having similar parts.

The big gotcha is tossing large chunks of C onto the ground to rail 
connections. A typical op amp is not at all happy with this. 

Bob

> On Jul 10, 2022, at 5:48 PM, Richard (Rick) Karlquist via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 
> 
> 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
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