Filter circuit with a notch filter

A power amplifier module integrated duplexer (PAMiD) frontend module, comprising:

• a filter circuit comprising, in a signal line;
• a band filter allowing to let pass a frequency band;
• and
• a notch filter circuited in series to the band filter for filtering out a stop band frequency, wherein the notch filter comprises:
• a single surface-acoustic-wave (SAW) resonator having a transducer with two bus bars and a number of transducer fingers alternatingly connected to one of the two bus bars, wherein:
• a finger distance between a center of two adjacent transducer fingers defines a portion of the stop band frequency within a notch band,
• the transducer of the SAW resonator comprises a number of different finger distances between transducer fingers of the transducer defining a number of different parallel shunt elements with respective stop band frequencies,
• each shunt element of the number of different parallel shunt elements is shifted in frequency against the other shunt elements such that the respective stop band frequencies are distributed over the notch band, and
• the notch filter provides the notch band, and
• a power amplifier and a matching circuit, wherein a further filter circuit operating in a neighboring band is part of the PAMiD frontend module or a different device operating together with the PAMiD frontend module and wherein the notch band is centered on the neighboring band.