You might look at: >G. Brida >High resolution frequency stability measurement system >Review of Scientific Instruments, Vol. 73, no. 5, pp. 2171-2174, >2002. >This article reports on the frequency stability measurement system >based upon the dual-mixer time-difference scheme working at 10 MHz >with 1 Hx beat note. The principle of the system is reviewed, the >design approach is described, and the experimental results are >presented. The measurement system shows a stability of 5.6ยท10-14/t >(Allan deviation) and a temperature sensitivity of some picoseconds >per Kelvin. An approach to reduce crosstalk problems has been >tested. Sorry,I don't have an electronic copy at the moment.It specifically addresses the gain/bandwidth zerocrossing detector issues. Peter ZL2AYX
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