Active high-pass filter and an active low-pass filter

摘要

a well-known active hochpau00dffilter and active low-pass has an active bandpau00dffilter (120), a first hochpau00dffilter (160). a first low-pass (130) is assigned. the known active hochpau00dffilter and the well-known active low-pass are such that these filters are trained, only a small phasendrehung in durchlau00dfbereich occurs.$a, the solution of the task is that between the entrance (10) of the active hochpau00dffilters or active tiefpau00dffilters and an entrance to the arbeitspunkteinstellung (15) of the active bandpau00dffilters (12), a second hochpau00dffilter (150). a second low-pass (140) is provided.a preferred field of application for a $a erfindungsgemu00e4u00dfes active low-pass is a pll circuit by the use of the active tiefpau00dffilters very low einschwingzeit.