TY - GEN
T1 - DC-coupled Doppler radar sensor with software-configured fine-tuning architectures for precise monitoring of complex motion patterns
AU - Yang, Yihong
AU - Gu, Changzhan
AU - Gale, Richard
AU - Chen, Jinghong
AU - Li, Changzhi
PY - 2012
Y1 - 2012
N2 - In most of the traditional miniature Doppler radar systems, AC coupling is used between the RF front-end and baseband amplifier. However, the AC coupling can lose very low frequency and DC information, which represent the stationary moment when detecting the movement of the object under test. Although a larger coupling capacitor can alleviate the problem to some extent, it will slow down the system response by increasing the settling time. DC-coupled radar sensors using fine-tuning architectures are proposed in this paper to preserve the DC information. This solution is realized for both on-chip design and board-level design. In the on-chip design, a two-stage variable gain amplifier (VGA) with software-configured DC tuning is proposed. In the board-level design, the AC coupling capacitors are removed and an adaptive feedback loop is used to perform DC offset calibration. Simulations and experiments show that the proposed DC-tuning architectures can completely relieve the radar sensor from circuit saturation and allow it to accurately monitor motions with stationary moments.
AB - In most of the traditional miniature Doppler radar systems, AC coupling is used between the RF front-end and baseband amplifier. However, the AC coupling can lose very low frequency and DC information, which represent the stationary moment when detecting the movement of the object under test. Although a larger coupling capacitor can alleviate the problem to some extent, it will slow down the system response by increasing the settling time. DC-coupled radar sensors using fine-tuning architectures are proposed in this paper to preserve the DC information. This solution is realized for both on-chip design and board-level design. In the on-chip design, a two-stage variable gain amplifier (VGA) with software-configured DC tuning is proposed. In the board-level design, the AC coupling capacitors are removed and an adaptive feedback loop is used to perform DC offset calibration. Simulations and experiments show that the proposed DC-tuning architectures can completely relieve the radar sensor from circuit saturation and allow it to accurately monitor motions with stationary moments.
KW - AC coupling
KW - DC coupling
KW - DC offset
KW - DC tuning
KW - Doppler radar
KW - displacement measurment
KW - variable gain amplifier
UR - http://www.scopus.com/inward/record.url?scp=84863633037&partnerID=8YFLogxK
U2 - 10.1109/WAMICON.2012.6208453
DO - 10.1109/WAMICON.2012.6208453
M3 - Conference contribution
AN - SCOPUS:84863633037
SN - 9781467301299
T3 - 2012 IEEE 13th Annual Wireless and Microwave Technology Conference, WAMICON 2012
BT - 2012 IEEE 13th Annual Wireless and Microwave Technology Conference, WAMICON 2012
T2 - 2012 IEEE 13th Annual Wireless and Microwave Technology Conference, WAMICON 2012
Y2 - 15 April 2012 through 17 April 2012
ER -