Title :
A modified charging algorithm for comparator-based switched-capacitor circuits
Author :
Wong, Kim-Fai ; Sin, Sai-Weng ; Seng-Pan U ; Martins, R.P.
Author_Institution :
Analog & Mixed-Signal VLSI Lab., Univ. of Macau, Macao, China
Abstract :
This paper presents a modified charging algorithm for fully-differential comparator-based switched-capacitor (CBSC) circuits by utilizing an additional comparator to compare a variable differential threshold rather than detecting the zero crossing during coarse (E1) transfer phase. The large overshoot in the coarse phase can be eliminated such that it relaxes the stringent trade-off between speed and accuracy, which exists in the conventional CBSC circuits. A 1.2-V Sample-and-Hold circuit implemented in 90 nm CMOS process is used to demonstrate the effectiveness of this concept.
Keywords :
CMOS analogue integrated circuits; comparators (circuits); sample and hold circuits; switched capacitor networks; CMOS process; charging algorithm; comparator-based switched-capacitor circuit; fully-differential CBSC circuit; sample-and-hold circuit; size 90 nm; voltage 1.2 V; CMOS technology; Charge transfer; Circuit simulation; Phase detection; Sampling methods; Switched capacitor circuits; Switches; Switching circuits; Timing; Voltage;
Conference_Titel :
Circuits and Systems, 2009. MWSCAS '09. 52nd IEEE International Midwest Symposium on
Conference_Location :
Cancun
Print_ISBN :
978-1-4244-4479-3
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2009.5236147
