220858 ⎘
Networks using active elements; Multiple-port networks; Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers Filters using operational amplifier poles
Biquad filter
#2Programmable baseband filter for selecting between single-pole or complex-poles frequency response
#3Programmable baseband filter for selectively coupling with at least a portion of another filter
#4Transfer-function control in an active filter