[time-nuts] GPSDO using 100Hz

Tim Shoppa shoppa at trailing-edge.com
Tue Nov 25 01:31:22 UTC 2008


Bruce wrote:
> Analog time  constants of several hours  are  generally considered
> impractical due  to  the  lack of  suitable  low  noise components
> principally high value resistors and capacitors.
> So how do you propose to get around this with an analog control loop?

Not too many years ago, high-impedance op-amps and teflon capacitors
were the way to do this.

The op-amp companies had application notes discussing "soakage"/dielectric
absorption in these circuits.

Tim.



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