Thanks for the pointer. I've taken a look at the AD8317. My main concern is whether it will operate accurately over the full range of frequency as the specification suggests a low frequency of 1MHz.
On the accuracy front, the data sheet seems to suggest +/-0.25dB over the -50dBm to -10dBm range and rather better (probably within my target) at the -40dBm to -10dBm range. So I guess a directional coupler IC (are there such things, and would that be the right part to pick off a sample portion of the signal over such a large frqeuncy range, or is there a better solution?) and an attenuator chip would do the job. For ultimate accuracy I'd need to keep a table of output correction values against frequency which would mean adding a microcontroller - which I was rather hoping to avoid. This looks more do-able with off the shelf parts than I'd expected. Thanks Dave -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of WB6BNQ Sent: 15 December 2008 11:40 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OT: Levelled sine wave generator What about some of the "log" detector made by Analog Devices ? Bill....WB6BNQ ' _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.