An Embedded Dynamic V oltage Scaling (DVS) System Through 55 nm Single-Inductor Dual-Output (SIDO) Switching Converter for 12-Bit Video Digital-to-Analog Converter Wen-Shen Chou, Tzu-Chi Huang , Student Member , IEEE,Y u - H u e i L e e, Student Member , IEEE, Y ao-Yi Y ang, Student Member , IEEE, Yi-Ping Su

Abstract

This paper proposes a 55 nm CMOS 12-bit cur- rent-steering video digital-to-analog converter (DAC) directly powered by the single-inductor dual-output (SIDO) switching converter to compose a dynamic voltage scaling (DVS) system and improve the power ef ficiency. Dual-DVS control in both digital and analog circuits can effectively reduce power consumption. With various supply voltages, the video DAC can meet several different speci fications in the power optimized (PO) mode. Fur- thermore, for DAC, the proposed 3S method, including finger separating, splitting and shifting, achieves good differential non- linearity (DNL) performance to 0.78/0.4 least signi ficant bit (LSB) and integral nonlinearity (INL) 1.3/1.0 LSB (with/without SIDO converter) without additional calibration. It also suppresses the switching noise interference from the SIDO converter. Moreover, for SIDO converter, the cross-regulation performance is greatly improved in both transient and steady state to achieve lowest interference for the analog supply. The total power ef ficiency can be improved up to 11.5% and 28% in the DVS and the PO mode. The SIDO supplied DAC with the dual-DVS function achieves 69.88 dB spurious free dynamic range (SFDR) at the 1 V output swing and 1 MHz input. The proposed intrinsic 12-bit DAC and SIDO converter achieve high de finition video DAC performance with the bene fit of area and energy ef ficiency.