Title :
Implementation of 4-bit Direct Charge Transfer Switched Capacitor DAC with mismatch shaping technique
Author :
Askhedkar, Anuja A. ; Agrawal, G.H. ; Gudgunti, Madhu
Author_Institution :
MAEER´s MIT, Pune, India
Abstract :
Direct Charge Transfer Switched Capacitor (DCT-SC) DAC is the internal DAC used in Delta-Sigma (ΔΣ) DAC which works on Over-Sampling concept. The Switched Capacitor DAC mainly suffers from mismatch among capacitors. Mismatch among capacitors in DAC, causes nonlinearity between output and input. Dynamic Element Matching (DEM) technique is used to match the capacitors. According to element selection logic there are many types. In this paper Data Weighted Averaging (DWA) technique is used for mismatch shaping. In this paper the 4 bit DCT-SC-DAC with DWA-DEM technique is implemented using WINSPICE simulation software in 180nm CMOS technology. DNL for DAC with DWA is ±0.03 LSB and INL is ± 0.02LSB.
Keywords :
CMOS integrated circuits; capacitors; delta-sigma modulation; switched capacitor networks; ΔΣ converter; CMOS technology; DCT-SC; DEM technique; DWA technique; WINSPICE simulation software; data weighted averaging technique; delta-sigma converter; direct charge transfer switched capacitor DAC; dynamic element matching technique; element selection logic; mismatch shaping technique; oversampling concept; size 180 nm; word length 4 bit; Capacitors; Charge transfer; Noise; Operational amplifiers; Semiconductor device modeling; Simulation; Switches; Δ-Σ DAC; DCT-SC-DAC; DEM; DWA; mismatch shaping;
Conference_Titel :
Pervasive Computing (ICPC), 2015 International Conference on
Conference_Location :
Pune
DOI :
10.1109/PERVASIVE.2015.7086968
