Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Output amplitute from an NCO

Am i right in thinking that the output amplitutde from the NCO is not constant over different frequencies?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

The basic commodity DACs are supposed to only do the digital to analogue conversion and are the cheapest.

Some application dedicated DACs contain a lot more circuitry and save you fpga work e.g. for comms they contain interpolators(3 stages of interpolate by 2 or more), Quadrature modulator, carrier synthesis... in fact it is like a full system rather than just DAC but cost shoots up naturally.

Not all aplications need this correction and you can avoid the worst of it by upsampling your signal so that its band is far away from Fs