Voltage mode Herwin-Huelsman-Newcomb circuit using CDBAs

A novel fully integrated voltage mode realization of the Kerwin-Huelsman-Ne wcomb biquad filter using the Current Differencing Buffered Amplifier (CDBA ) is presented. Independent control on the bandwidth, quality factor and ga in can be achieved through control voltages. Ail possible combinations of p olarities of the highpass, bandpass and lowpass responses can be obtained. A comparison between previously published implementations of the KHN biquad is included. Analysis of the parasitics associated with the CDBA is presen ted and compensation techniques are included.