FPGA-based DDS spur plot - clock of 2.4 GHz, span 0 to 700 MHz
Speed
• 20 ns switching speed
Spurious
• < -70 dBc
Phase Noise
• -140 dBc/Hz @ 10 kHz
• -147 dBc/Hz @ 100 kHz
Flexibility of FPGA-based DDS
• Multiple sine ROM implementations optimized for user application
• Custom control interface designs
• Variable accumulator depths to control numerical performance
DAC "agnostics"
• Designs have been developed to interface with single channel and MUX DAC's
• DDS clock speed determined by DAC specification and FPGA I/O design
• Up to 2.5 GHz clock
Synthesizers from ITT Microwave Systems are built around our latest high-performance direct digital synthesis (DDS) technology. With exceptional spurious and phase noise performance, our DDS-based signal generators produce digital waveforms so clean that minimal additional circuitry is needed to meet even the most stringent requirements.
In addition to offering exceptional spurious-free dynamic range and output phase noise, the DDS engine allows our synthesizers to deliver industry leading switching times anywhere within the operating frequency range. And because of our software-based DDS approach, we can easily support requirements for custom waveform generation, phase continuous or phase coherent output, and precise control of the start, stop and repetition rate of output signals. While competitive synthesizer architectures struggle with cleaning up the DDS signal, our unique approach has given us the foundation to develop an innovative product solution that will leave you wondering why you would want a synthesizer made any other way.
With this enabling DDS technology, our engineers were able to develop an innovative synthesizer architecture comprised of multiple expander slices. Each expander slice increases the frequency range of the previous slice. An output module is the final slice providing the synthesizer output interface, along with incorporating any specific customer requirements with regard to output power, modulation, etc. By carefully selecting and combining the appropriate expanders for the job, we can tailor a solution to your price/performance requirements.