Title :
Slew rate induced distortion in switched-resistor integrators
Author :
Jiraseree-amornkun, A. ; Worapishet, Apisak ; Klumperink, Eric A. M. ; Nauta, B. ; Surakampontorn, W.
Author_Institution :
Fac. of Eng. & Res. Center for Commun. & Inf. Technol., King Mongkut´´s Inst. of Technol., Bangkok
Abstract :
Opamp-RC integrators built with linear resistors and capacitors can achieve very high linearity. By means of a switched resistor, tuning of the RC time-constant is possible via the duty-cycle of the clock controlling the switched resistor. This paper analyzes the effect of opamp slew rate limitations on the distortion of a switched-resistor lossy opamp-RC integrator. We show via analysis and simulations that the use of two sets of switched resistors instead of one relaxes the opamp slew rate requirements, and reduces the resulting distortion significantly
Keywords :
active filters; distortion; integrating circuits; operational amplifiers; opamp-RC integrators; slew rate induced distortion; switched-resistor integrators; Capacitors; Clocks; Linearity; Nonlinear filters; Passive filters; Rate distortion theory; Resistors; Switches; Switching circuits; Voltage;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693127
