Embedded anti-aliasing in switched-capacitor ladder filters

A combination of continuous-time and switched-capacitor integrators in a simulated LC loss-less ladder yields a response with suppressed aliasing without using continuous-time pre-filtering. Fabricated in a 0.35-/spl mu/m CMOS process, a fifth-order Cauer low-pass filter has a cutoff frequency of 1....

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Bibliographic Details
Main Authors: Senderowicz, D., Azuma, S., Kawama, S., Iizuka, K., Miyamoto, M.
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
Capacitors
CMOS process
Cutoff frequency
Low pass filters
Operational amplifiers
Passband
Power supplies
Prototypes
Tuning
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Summary:A combination of continuous-time and switched-capacitor integrators in a simulated LC loss-less ladder yields a response with suppressed aliasing without using continuous-time pre-filtering. Fabricated in a 0.35-/spl mu/m CMOS process, a fifth-order Cauer low-pass filter has a cutoff frequency of 1.92 MHz and aliasing suppression of better than 40 dB. Without using any tuning mechanism, /spl plusmn/10% accuracy of the cut-off frequency is achieved. It consumes 3.7 mA at 1.8-V power supply in a die-area of 0.27 mm/sup 2/.
DOI:10.1109/CICC.2001.929714