A 10-Bit 500 MSPS Segmented DAC with Optimized Current Sources to Avoid Mismatch Effect

作者: Santanu Sarkar , Swapna Banerjee

DOI: 10.1109/ISVLSI.2015.87

关键词: LinearityCurrent sourceSpurious-free dynamic rangeTransistorLeast significant bitElectrical engineeringDifferential nonlinearityCMOSElectronic engineeringEngineeringIntegral nonlinearity

摘要: This paper describes the design techniques of a segmented current steering (CS) digital-to-analog converter (DAC)with optimum sizing sources. The DAC has been designed in 0.18 a#x03BC;m CMOS n-well technology provided by National Semiconductor. 10-bit is as 5+5, where 5-LSB bits are implemented binary and 5-MSB unary architecture. matching unit sources plays an important role determining overall linearity DAC. Static can be improved using larger area source transistors, sacrificing dynamic performances. At high frequency spectral performance degrades due to increased parasitic. In this work with sizes achieve static well simulation, achieves maximum DNL 0.248 LSB INL 0.440 LSB. spurious free range (SFDR) 59.79 dB for 5.37 MHz signal mismatch environment at 500 MSPS sampling rate. shows Nyquist SFDR 57 rate mismatch. consumes only 17.85 mW power 1.8 V supply.

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