Title :
Behavioral Modeling of Switched Capacitor Integrators with Application to ΣΔ Modulators
Author :
Suarez, Gilbert ; Jimenez, Manuel ; Fernandez, Felix O.
Author_Institution :
Electr. & Comput. Eng. Dept., Univ. of Puerto Rico, Mayaguez
Abstract :
This paper presents two accurate behavioral models for switched-capacitor integrators with application to the modeling of low-power high-speed ΣΔ modulators. The first model is based on the integrator transient response and includes the effects of the amplifier transconductance, and output conductance. The second model is based on a symbolic node admittance matrix representation of the system. VHDL-AMS and MATLAB Simulink were used to implement the first and second model, respectively. Simulations for a GSM/WCDMA second-order multibit ΣΔ modulators model were performed, exhibiting less than 5.0% of error in the signal-to-noise plus distortion ratio (SNDR) when compared to experimental data.
Keywords :
cellular radio; code division multiple access; hardware description languages; harmonic distortion; high-speed techniques; integrating circuits; low-power electronics; mathematics computing; sampled data circuits; sigma-delta modulation; switched capacitor networks; transient analysis; GSM/WCDMA; MATLAB Simulink; VHDL-AMS; amplifier transconductance effects; behavioral modeling; conductance effects; integrator transient response; low-power high-speed ΣΔ modulators modeling; signal-to-noise plus distortion ratio; switched capacitor integrators; symbolic node admittance matrix representation; Admittance; Application software; Capacitors; Distortion; Frequency; MATLAB; Mathematical model; Parasitic capacitance; Transconductance; Transient response;
Conference_Titel :
Circuits and Systems, 2006. MWSCAS '06. 49th IEEE International Midwest Symposium on
Conference_Location :
San Juan
Print_ISBN :
1-4244-0172-0
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2006.381829
