The theoretical model (single-channel and parallel compensation type) and the microphonic noise model of the Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIMNT) pyroelectric infrared detectors with current mode are established and improved. The theoretical model is used for simulation, and a single-channel and two compensated (sensitive element separated and integrated) PIMNT pyroelectric infrared detectors are designed and prepared. The responsivity (RV), noise (un), specific detectivity (D*) and microphonic noise (uvib) of these three detectors are tested and compared. The results show that, compared with the single-channel PIMNT infrared detectors, the detection ability of the compensated infrared detectors is slightly reduced, but the anti-jamming ability has been greatly improved.