A digital breast cancer detection system using 65 nm technology complementary metal oxide semiconductor (CMOS) integrated\ncircuits with rotating 4 Ã?â?? 4 antenna array is presented. Gaussian monocycle pulses are generated by CMOS logic circuits and\ntransmitted by a 4 Ã?â?? 4 matrix antenna array via two CMOS single-pole-eight-throw (SP8T) switching matrices. Radar signals are\nreceived and converted to digital signals by CMOS equivalent time sampling circuits. By rotating the 4 Ã?â?? 4 antenna array, the\nreference signal is obtained by averaging the waveforms from various positions to extract the breast phantom target response. A\nsignal alignment algorithm is proposed to compensate the phase shift of the signals caused by the system jitter. After extracting the\nscattered signal from the target, a bandpass filter is applied to reduce the noise caused by imperfect subtraction between original\nand the reference signals. The confocal imaging algorithm for rotating antennas is utilized to reconstruct the breast image. A 1 cm3\nbacon block as a cancer phantom target in a rubber substrate as a breast fat phantom can be detected with reduced artifacts.
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