[time-nuts] OT: Levelled sine wave generator
David C. Partridge
david.partridge at dsl.pipex.com
Mon Dec 15 15:09:05 UTC 2008
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-bounces at febo.com [mailto:time-nuts-bounces at 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
'
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