A 4-channel time interleaved sampler based 3-5 GHz band CMOS radar IC in 0.13 µm for surveillance

This paper presents a 3-5 GHz band CMOS UWB radar IC realized in a 0.13 mm CMOS technology for surveillance. Sampling resolution and detectable range of the proposed IC are determined to be 3 cm and 15 m, respectively, to serve a surveillance function. To reduce the scan time while satisfying resolution and detection range, equivalent time sampling and a 4-channel time interleaved sampler are used. The DC offset mismatch in the 4-channel receiver is greatly reduced via a DC offset compensation and BJT-based op-amp for analog signal processing (ASP) circuits. Measurement results show that the center frequency and bandwidth of the pulse can be adjusted in the range of 3 GHz - 5 GHz and 0.5 GHz - 2 GHz, respectively. The measured range for human target is up to 11 m. The chip size is 4 mm ´ 2.5 mm, and 81 mA (transmitter) and 38 mA (receiver) are consumed at 1.5 V supply.