Browsing by Author "Cheng, Fu-Yuan"

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A Fully-Integrated Wireless Bondwire Accelerometer With Closed-loop Readout Architecture
(2015-10-01)
Liao, Yu-Te
;
Huang, Shih-Chieh
;
Cheng, Fu-Yuan
;
Tsai, Tsung-Heng
;
電機資訊學士班
This paper presents a fully-integrated wireless bondwire accelerometer using a closed-loop readout interface that effectively reduces the noise from electrical circuits and long-term frequency drifts. The proposed accelerometer was fabricated using 0.18-mu m CMOS technology without micro electromechanical systems (MEMS) processing. To reduce manufacturing errors, the bondwire inertial sensors are wire-bonded on the chip pads, thereby enabling a precisely-defined length and space between sensing bondwires. The proposed wireless accelerometer using a pair of 15.2 mu m and 25.4 mu m bondwires achieves a linear transducer gain of 33 mV/g, bandwidth of 5 kHz, a noise floor of 700 mu g/root Hz, and 4.5 mu g bias stability. The acceleration data is digitalized by an energy-efficient 10-bit SAR ADC and then wirelessly transmitted in real time to the external reader by a low-power on-off shift keying (OOK) transmitter. The proposed architecture consumes 9 mW and the chip area is 2 mm x 2.4 mm.
A Low-Power Wireless Bondwire Inertial Sensor System
(2015)
Huang, Shih-Chieh
;
Lu, Shao-Yung
;
Cheng, Fu-Yuan
;
Tsai, Tsung-Heng
;
Liao, Yu-Te
This paper presents the design and implementation of a fully-integrated CMOS accelerometer using bondwires as sensing devices without Micro Electro-Mechanical Systems (MEMS) processes. The model and analysis of bondwire inertial sensors are provided for further implementation of low-power and low-noise accelerometers. Finite element method (FEM) simulation is performed to verify the concept and model. This paper also proposes a closed-loop readout interface that suppresses the in-band noise and reduces both design complexity and power consumption. The bondwire accelerometer is fabricated in a 0.18 mu m CMOS process, achieves a 33 mV/g linear transducer gain within a 5 kHz bandwidth, and consumes 9 mW.