This letter presents a fully monolithic microwave integrated circuit (MMIC) switched filter banks (SFBs) that feature a digitally selectable operation bandwidth frequency. The integrated SFBs with four independently controlled channels span the 2GHz to 12GHz frequency range. Unlike the existing methods, the proposed SFB consists of a pair of single-pole four-throw (SP4T) switches coupled with four band-pass filters (BPFs), and the TTL signal can directly drive the SFB through an inner integrated FET-driven circuit, achieving facility usage in the RF system. For verification, two wideband SFB MMICs were designed and fabricated using a 0.25-µm gallium arsenide (GaAs) based InGaAs pHEMT Enhancement/Depletion-Mode Device (E/D-Mode) process, named the low-band SFB and high-band SFB. Measurement results show that the minimum insertion losses for the four channels of the proposed low-band MMIC SFB are around 4.6 to 6.3dB. The measured Rectangle factor SF_30dB for the four channels are all below 1.87. The measured minimum insertion losses are around 4.9 to 6.1dB for the high-band SFB. The measured Rectangle factor SF_30dB for the four channels are still bellow 2.15. The proposed SFB MMIC shows remarkable selectivity and high integration.