RRR . you are right about drop and noise..
For others not familiar with this behaviour, one thing when looking is
PSRR etc on LDOs..take a good look at this value VERSUS dropout /
headroom . Most devices are in the toilet when dropout is nigh... In my
SDRs I (used) to run 2V around for 1.8V point of load LDO supplies.
PSRR 100k went up alot when I bumped the supply rail to 2.2V...
On 9/07/2019 10:44 AM, jimlux wrote:
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
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