文摘
An energy-efficient digital-to-analogue converter (DAC) switching scheme with high-accuracy is proposed for successive approximation register (SAR) analogue-to-digital converters (ADCs). By utilizing a complementary switching method, the proposed switching scheme achieves a 98.4% switching energy reduction and a 75% area reduction compared to the conventional SAR ADC. Moreover, the accuracy of the SAR ADC is independent on the accuracy of the third reference voltage (Vcm) except the least significant bit, and the common-mode voltage of the DAC outputs keeps approximately unchanged during a conversion cycle, making the design of the SAR ADC more relaxed.