Dual-channel Multi-Nyquist Zone DAC with Digital Up-conversion

Pacific Microchip Corp. proposes to develop a rad-hard dual-channel 8-bit DAC ASIC sampling at up to 30GS/s and able to operate in several Nyquist zones. The ASIC is targeted for synthesis of the transmitter waveform in radar instruments used for planetary remote sensing applications. Instead of directly synthesizing entire signal bandwidth, a digital up-conversion technique and interpolation with a configurable factor will be used in the DAC. This approach will allow us to translate the signal with narrow bandwidth to any RF frequency within 3 adjacent Nyquist zones of the DAC. The presence of two DACs on the ASIC will make possible to synthesize two waveforms with a small phase error. Seeking to maximize the performance, the DAC will employ calibration using a built-in CPU and finite-state machines. For convenient interfacing with FPGAs at up to 8x8.75Gb/s (4 lanes per DAC), the ASIC will include a JESD204B standard compliant interface.Phase I work will provide the proof of DAC feasibility ndash; critical blocks will be implemented and verified at the targeted technology node. Innbsp;Phase II, a silicon proven prototype ASIC will be provided.