How much of an improvement does the LTC6957 give over, say, a simple
74AC gate?
Actually, is there a list of different techniques and the performance of
each? I know that the LPRO Integration manual gives some good info for
phase noise, but I'm not aware of a similar document for slew rate (AKA
rise time).
Ed
On 7/10/2014 12:40 PM, [email protected] wrote:
On July 10, 2014 at 10:55 AM [email protected] wrote:
As part of the FE 405 B project a separate output circuit is in the works.
The universal controller and auxiliary board are the same as used in the
FE5680A GPSDO but because of the very low ADEV a separate circuit board that
divides by three and has also two ground isolated transformer outputs is in
the works.The question is what is the best sine to square wave converter
with the lowest ADEV contribution. I am looking at Bruce's circuit using the
ADCMP600. Any other ideas?
Thanks Bert Kehren
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Although CERN likes that circuit for its ruggedness and versatility its a
little noisier than some alternative circuits.
Currently Linear Technology's sine to square wave devices with selectable
filtering (LTC6957 series) are better in that they are a closer approximation to
the ideal zero crossing detector.
Failing that the next best is perhaps an AC coupled (both at input and between
emitters) differential pair of 2N3906's or similar.
Bruce
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