On 7/8/19 4:53 PM, Richard (Rick) Karlquist wrote:
On 7/8/2019 11:09 AM, jimlux wrote:
Not only are they low noise, but they have spectacularly good HF
rejection across the regulator up to 10s of MHz.
In the 5071A, I wanted high bandwidth PSRR and stumbled across
a designer's manual (HP internal document) for the MMS Modular
Measurement System. They described a regulator with a common base
pass transistor and an op amp, with a bandwidth approaching 1 MHz.
Quite state of the art for the time. I copied the design in several
5071A modules. We used it to regulate +5V from the Vicor modules down
to +4.5V working voltage for 100 series ECL or analog. It worked quite
well. Now I could replace it with an LT3065.
Rick N6RK
Barely<grin> - I've got bit in the past by coming too close to the LDO
minimum voltage. 300mV for those parts, so as long as your +5 had
decent regulation, and the ripple didn't drop below 4.8V, and you didn't
draw more than 300 mA.
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