ABSTRACT

An eight-channel 10-MHz wide-bandwidth electrical impedance tomography (EIT) IC is proposed for early breast cancer detection system. To increase the resolution of EIT images, the proposed IC has three key features: 1) wide-bandwidth instrumentation amplifier (WB-IA) to detect large impedance changes in cancer cells at a high frequency; 2) dual-mode driver (DM-driver) to obviate the complex switching network to reduce the noise and the system form factor; and 3) phase compensation loop (PCL) to efficiently correct the phase error for accurate images without artifacts. The proposed EIT IC occupies 16 mm2 in the 65-nm CMOS technology and consumes 9.6 mW for each channel. The key features, the proposed breast cancer detection system with the dedicated EIT IC can operate up to 10 MHz with a small phase error of 4.32◦ and a state-of-the-art impedance resolution of 1.6 m/ √Hz eventually can detect a small-size target object of 0.5 cm.