ACTIVE BANDPASS FILTER CIRCUIT WITH ADJUSTABLE RESISTANCE DEVICE AND ADJUSTABLE CAPACITANCE DEVICE

摘要

In an illustrative example, a device includes an operational amplifier (106, 136) of an active bandpass filter circuit (100). The device further includes an adjustable resistance device (118, 122, 128, 130, 200, 404) configured to adjust a center frequency associated with the active bandpass filter circuit (100). The device further includes an adjustable capacitance device (112, 114, 132, 138, 300) configured to adjust the center frequency and a bandwidth associated with the active bandpass filter circuit (100). The adjustable resistance device may have a stabilisation capacitor (406) in parallel.