Ten-Bit 0.909-MHz 8-Channel Dual-Mode Successive Approximation ADC for a BLDC Motor Drive

Electronics

Shan-Hao Sung¹  Guo-Ming Sung¹  Chao-Hung Huang¹  Chong-Cheng Huang¹  Xiong Xiao² 

[1] Department of Electrical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;Department of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China;

关键词: SAR ADC;    dynamic comparator;    sample-and-hold circuit;    digital-to-analog converter;    BLDC motor;   

DOI  :  10.3390/electronics10070830

来源: DOAJ

【 摘 要 】

This paper presents a 10-bit 0.909-MHz 8-channel dual-mode successive approximation (SAR) analogue-to-digital converter (ADC) for brushless direct current (BLDC) motor drive, using a Taiwan Semiconductor Manufacturing (TSMC) 0.25 μm 1P3M Complementary Metal Oxide Semiconductor (CMOS) process. The sample-and-hold (S/H) circuit operates with two sampling modes. One is individually sampling eight channels in sequence with an S/H circuit and the other is sampling four channels simultaneously with four S/H circuits. All sampled data will be digitized with high-speed SAR ADC in time division multiplexing (TDM). A dynamic latch-type comparator is utilized to latch the output at an upper or lower level. The advantage of the designed comparator is that it performs with positive feedback to quickly complete the latch function. The double-tail latch-type architecture is utilized to mitigate the significant kickback effect by separating the pre-amplifier stage from the latch. By integrating an input NMOSFET with an input PMOSFET, the designed latch-type comparator can perform with full-swing input voltage. Measurements show that the signal-to-noise ratio (SNR), signal-to-noise-and-distortion ratio (SNDR), effective number of bits (ENOB), power consumption, and chip area are 50.56 dB, 57.03 dB, 8.11 bits, 833 μW, and 1.35 × 0.98 mm², respectively. The main advantages of the proposed multichannel dual-mode SAR ADC are its low power consumption of 833 μW and high measured resolution of 8.11 bits.

【 授权许可】

Unknown