20b-linear 100MS/s DAC

  • Implementation technology: X-FAB 180nm SOI (XT018) 5+1 Metal, Double-MiM Cap for high linearity and low temp. coeff.

  • Architecture: digital oversampling Sigma-Delta Modulator with 38 current-steering cells and 2-stage 3rd order analog active-RC reconstruction filtering with two fully differential Voltage Amplifiers

  • Power Supply: 1.8Vdd analog & digital core, 5Vdd analog power output

  • 20bit 10MS/s digital input interpolated (10x, 20x) to 100MS/s as oversampling Sigma-Delta Modulator input

  • 3 different digital scrambler/randomizer implemented: Dynamic Element Matching (DEM), Data Weighted Averaging (DWA) to mitigate transistor mismatch at 20 bit level

  • Fully differential 2-stage analog signal path with out-of-band noise filtering (> 1,25MHz)

A close-up view of a computer circuit board with various electronic components, including rectangular chips and connectors.
Close-up of a solar panel with small, reflective, iridescent square cells, some showing rainbow colors.
A technical block diagram of a signal processing system showing various components, including an upsampler, SD-modulator, binary-to-thermometer coder, DWA-scrambler, and an analog filter with current sources, a comparator, resistors, and operational amplifiers, illustrating the signal flow and processing stages.