Switched-capacitor filters tend to display reduced performance when implemented at reduced feature size because of higher KT/C and l/f noise, and reduced operational amplifier gain and swing. This paper describes some circuit solutions to certain performance degradations associated with technology scaling, including chopper stabilization, and class AB differential operational amplifier architecture. An experimental fifth order elliptic PCM low-pass filter, using 3p CMOS technology, achieved an area of 200 mil* per pole. Typical measured results for a f2.5V power supply are: a dynamic range of 87 dB, a power supply rejection ratio (PSRR) of 40 dB over l-MHz range.
A scalable high-performance switched-capacitor filter
CASTELLO, RINALDO;
1986-01-01
Abstract
Switched-capacitor filters tend to display reduced performance when implemented at reduced feature size because of higher KT/C and l/f noise, and reduced operational amplifier gain and swing. This paper describes some circuit solutions to certain performance degradations associated with technology scaling, including chopper stabilization, and class AB differential operational amplifier architecture. An experimental fifth order elliptic PCM low-pass filter, using 3p CMOS technology, achieved an area of 200 mil* per pole. Typical measured results for a f2.5V power supply are: a dynamic range of 87 dB, a power supply rejection ratio (PSRR) of 40 dB over l-MHz range.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
