Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
I have seen somewhere that there were DDSs with sampling frequency more than 1GHz which designed using GaAs.
Unfortunately i can not remeber where. Also remember that the drawback of that products was high price and low resolution of their DACs(e.g. 8-bit) which yields to worse SFDR than others.
If your application is high frequency but fmax - fmin is less than 200MHz, you can simply use an Analog Devices DDS and mix its output with a fixed oscilator. but if in your application fmax - fmin is so high you can use mixed techniques such as hyprid PLL - DDS synthesizer. In this configuration output of an DDS is multiplyed with a PLL.
I think if you specify your design requirements we can help you more.
Why just need DDS-method?
If you approach only DDS: try apply after DDS analog freqency-multiply
other way: DDS_sample_freqency - may be not equal to 2*Output_bandwidth
By DDS_sample_freqency=1Ghz is possible get output frequency higher 1 GHz
this method describe in more AD DDS datasheets
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
