Calibrated switched capacitor integrators based on current conveyors and its application to Delta Sigma ADC

Author

Balasubramaniam, Harish ; Hofmann, Klaus

Author_Institution

Integrated Electron. Syst. Lab., Tech. Univ. Darmstadt, Darmstadt, Germany

fYear

2014

fDate

June 30 2014-July 3 2014

Firstpage

1

Lastpage

4

Abstract

In this paper a fully differential current conveyor based switched capacitor (SC) integrator is presented. To operate the current conveyor (CCII) integrator with high linearity, calibration is used to correct for its non idealities. Simulation results are presented to show the effectiveness of the calibration technique. The presented integrator is applied to design of a 2^nd order Delta Sigma ADC. A comparison of the calibrated and uncalibrated ADC outputs reveals that the calibration technique improves the dynamic range and SNDR significantly. The oversampled ADC gives more than 85 dB DR and 76 dB SNDR for bandwidth of 0.5 MHz and clock frequency of 80 MHz respectively.

Keywords

analogue-digital conversion; calibration; current conveyors; delta-sigma modulation; switched capacitor networks; 2^nd order delta sigma ADC; CCII integrator; SC integrator; SNDR; bandwidth 0.5 MHz; calibrated switched capacitor integrators; dynamic range; frequency 80 MHz; fully differential current conveyor; high linearity calibration technique; Calibration; Capacitors; Charge transfer; Clocks; Modulation; Sigma-delta modulation; Topology; Calibration; Current Conveyor Integrator; Oversampling ADC; Sigma Delta ADC;

fLanguage

English

Publisher

ieee

Conference_Titel

Ph.D. Research in Microelectronics and Electronics (PRIME), 2014 10th Conference on

Conference_Location

Grenoble

Type

conf

DOI

10.1109/PRIME.2014.6872725

Filename

6872725