Signal filtering system for preamplifier has low pass filter section creating feedback signal

摘要

The system has a low pass filter (100) for a first range of signals. The filter produces a first feedback signal (208). The system includes a difference amplifier (202) which is connected with the filter (100), and which subtracts the first signal (208) from an input signal (206), to produce a high pass filtering effect. Independent claims are included for methods for filtering signals.