20b-linear 100MS/s DAC (Digital/Analog Converter) with 98dB SNR in 300kHz

Features

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

Block Diagram of the 20b-linear 100MS/s DAC (Digital/Analog Converter) with 98dB SNR in 300kHz