A 2.4 V, 12 mW stereo audio D/A converter with double sampling switching

A 2.4 V 16-bit stereo audio digital-to-analog (D/A) converter was implemented using a 0.35 μm CMOS technology. The DAC utilize an interpolation filter, 1-bit 4th-order noise shaper, switched-capacitor (SC)-postfilter with double sampling switching circuit and achieved low power, high resolution from a single 2.4 V supply. The proposed double sampling capacitor switching technique of the SC-postfilter is applied to improve the signal-to-noise ratio (SNR) which is limited by sampling noise depending on the capacitor value. Since the proposed technique can be implemented by adding a simple switching circuit compared with previous SC-postfilter techniques, it allows smaller area and lower power consumption. The D/A converter occupies a die area of 3 mm² (2000 μm×1600 μm) and dissipates 12 mW at 44.1 kHz sampling rate with a 2.4 V single supply voltage. Typical dynamic range and signal-to-noise, distortion ratio (SNDR) are 95 dB and 88 dB, respectively