Title :
Channel Charge Injection analysis and its modeling in z-domain for switched-capacitor integrators
Author :
Torkzadeh, Pooya ; Atarodi, Mojtaba
Author_Institution :
EE Dept., Sharif U. of T., Tehran, Iran
Abstract :
Sigma-delta modulator ADCs used in signal processing applications are usually implemented by switched-capacitor (SC) circuits and CMOS transmission gates. Channel Charge Injection (CCI) effect is one of major non-ideal parameters existing in TG switches corrupting modulator total SNDR, its linearity and its total gain. In this paper, a comprehensive analysis of CCI non-ideal effect on CMOS transmission gates (TGs) and SC integrator using actual clock timing and charge injection model will be presented. The relation between output error and input signal level will be extracted and finally its modeling for switched capacitor integrator using probabilistic equations in z-domain will be presented. Evaluation and validation for extracted models were performed via behavioral and transistor-level simulations for an implemented third-order modulator using 0.18 mum CMOS technology in SIMULINK and Agilent ADS environments.
Keywords :
CMOS integrated circuits; Z transforms; charge injection; integrating circuits; sigma-delta modulation; signal processing; switched capacitor networks; Agilent ADS environments; CCI comprehensive analysis; CMOS transmission gates; SIMULINK; behavioral simulations; channel charge injection analysis; clock timing; sigma-delta modulator ADC; signal processing applications; size 0.18 mum; switched-capacitor integrator; third-order modulator; transistor-level simulations; z-domain; CMOS process; CMOS technology; Clocks; Delta-sigma modulation; Linearity; Radiofrequency interference; Semiconductor device modeling; Signal processing; Switches; Switching circuits;
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.2009.5236137