A 108dB-DR 120dB-THD and 0.5Vrms output audio DAC with inter-symbol-interference-shaping algorithm in 45nm CMOS

We propose a new digital algorithm that can shape element mismatch and ISI errors simultaneously. This method fully shapes ISI and the mismatch errors outside audio band and eliminates the need for layout critical and non-automat ed analog design methods that often require multiple design iterations and are hard to migrate over processes. This is enabled by using digital processing circuits that are simple and predictable with modern EDA tools and come at low cost in power and area using deep-submicron CMOS. In addition, the proposed solution works at regular DSM clock rate and does not require another PLL and clock management circuit.