关键词: 串型, 电流舵, 数模转换器

Abstract: A dual channel Digital to Analog Converter (DAC) is presented, which consists of current-steering and resistance string. The design adopts a 4+6+6 piecewise mode, which can effectively reduce the power consumption of DAC from the perspective of structure. The decoding structure of series resistance type 16 choose 1 is adopted for the high 4 bits. The decoding structure of series resistance type 64 choose 1 is adopted for the middle 6 bits. The decoding structure of the thermometer current rudder is adopted for the low 6 bits. The Spectre tool is used to simulate and verify the functions and performance of DAC.The circuit layout is realized by using 0.5μm CMOS process.The simulation results show that the current consumption is 730 μA, the ENOBis 15.19 bits, the SNR is 93.21 dB, the THD is 62.62 dB, and the SFDR is 94.49 dB.

Key words: serial, current-steeringdigital-to-analogconverter