Reply by Allan Herriman December 10, 20042004-12-10
On Fri, 10 Dec 2004 17:58:47 +1100, Allan Herriman
<allan.herriman.hates.spam@ctam.com.au.invalid> wrote:

>The AD9901 is basically an XOR gate with an added frequency >discriminator.
... and T flip flops on the XOR inputs to ensure 50% duty cycle. Allan