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Integrated 18th-order pseudo-N-path filter in VIS-SC technique

: Brueckmann, D.; Schweer, R.; Fettweis, A.; Hosticka, B.J.; Kleine, U.; Pandel, J.; Zimmer, G.

IEEE journal of solid-state circuits 21 (1986), Nr.1, S.48-56 : Abb.,Tab.,Lit.
ISSN: 0018-9200
Fraunhofer IMS ()

An integrated 18th-order frequency symmetrical switched-capacitor (SC) band-pass filter is described that has been realized according to the approach involving the use of voltage inverter switches (VIS's) in form of recharging devices. The filter has been implemented in a standard CMOS technology. It has been conceived for use as "channel filter" in modulation schemes for PCM/FDM and audio/FDM conversion. Staring from a high-pass filter as reference filter, the SC filter is designed as pseudo N-path filter, with N=2. The application of the pseudo-N-path principle has lead to a substantial amount of saving in hardware. (IMS)