A long time ago I made a 12bit tining word DDS running at 40.96 or 20.48MHz using just the MSB as a 1 bit DAC for AM radio. I used a 74XX adder with DIP switches for the phase accumulation delta and some octal D registers to hold the phase. It worked well enough for subjective superhet listening, although I did not characterize the design much. Frank
--- In [email protected], "Leon" <[EMAIL PROTECTED]> wrote: > > > ----- Original Message ----- > From: jacupoam03 > To: [email protected] > Sent: Monday, April 09, 2007 11:58 PM > Subject: [soft_radio] Re: DDS makers other than analog devices and Intersil > > > Hi Frank, > > Back in the mid 90's I build a couple of DDS boards 1 used a Harris > NCO and a RCA high speed DAC and the other used a Qualcom DDS - I > believe both projects were in the 73 magazine. I have not seen > anything from either manufacture for years. I think Qualcom products > are more oriented to the cellular industry. > > I have not done much with FPGA and similar chips, but I get the > impression that it may be possible to implement (program) a DDS in > that technology. I may be wrong here though. > > -------------------------------------- > > Yes, a DDS can be implemented in an FPGA. > > 73, Leon > Leon Heller > -- > Amateur radio call-sign G1HSM > Yaesu FT-817ND and FT-857D transceivers > Suzuki SV1000S motorcycle > [EMAIL PROTECTED] > http://www.geocities.com/leon_heller >
