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The capacitively-coupled current conveyer second-order section (C4 SOS) is a continuous-time bandpass filter with electronically tunable corner frequencies and ±40 dB/decade or greater roll offs. The corner frequencies can be set independently of each other, and the bandwidth can therefore be tuned at will. Each corner can have its own Q peak or, if the corners are brought close together, a very tight bandwidth with a single Q peak develops. This leads to further isolation of any given frequency and is thus useful for signal processing applications. An array of these C4 SOSs with exponentially spaced center frequencies forms a good model of the human cochlea (inner ear) where signals are decomposed with filtering processes that have Q≈30.
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on (Volume:5 )
Date of Conference: 2002