A 12 Bit R-2R Digital-to-Analog Converter for Shuttling Operation in a Trapped-Ion Quantum Computer
Alexander Meyer, Peter Toth, A. Engelhardt, Jens Repp, Matthias Brand, Вадим Іссаков · 2023
This work presents a 12 bit, resistive R-2R ladder-based Digital-to-Analog Converter (DAC) intended to generate arbitrary waveforms for shuttling operation in a trapped-ion quantum computer (TIQC) using 171 Yb + ions. The DAC operates at a sampling frequency of 1 MHz and can replicate constant, sinusoidal, rectangular, and triangular signals within a full-scale (FS) range of ±0.9V and a resolution of 500 μV. To mitigate ion shaking in the trap, a low pass filter minimizes glitch errors at major output code transitions and a spectral noise density (SND) of 45.3nV/VHz has been measured at 100 kHz. Implemented in a 130 nm high-voltage (HV) bulk CMOS technology, the DAC consumes 1.1 m W from a 1.5 V power supply at room temperature (RT). This includes a reference buffer and a serial peripheral interface (SPI) to read in the DAC control words. The whole circuitry takes up an active area of 1200 x 700 μm2excluding pads. Due to its small area, low power consumption and excellent noise performance, the DAC is ideally suited as the core building block for an ion shuttling controller IC.