|Author's Email Address
||This thesis had been viewed 5559 times. Download 1313 times.|
|Type of Document
||A Phase Detector with Offset Voltage Calibration for Biosensors|
|Date of Defense
current feedback instrumentation amplifier
phase shift detector
||Biological signal measurement becomes very important as the technology rapidly advances. Consequently, it drives the development of biosensors and biosensing technologies. Particularily, the phase of the bio-signals is a significant information to tell the bio-features. Therefore, it is important to enhance the precision of the phase shift detector to ensure the credibility.|
The first research topic of this thesis is a phase shift detector with offset voltage calibration. To eliminate the offset caused by mismatch of MOSFET differential pair in the input stage of the comparator, we propose an offset calibration design. By regulating the bulk voltage of the selected MOSFET in the comparator, the offset voltage is significantly reduced. The calibrated offset voltage is 5.35 mV in the worst case by all-PVT-corner simulations. The ouptut error of the proposed phase shift detector is between -0.68% and 2.37%.
The second topic is a current-feedback intrumentation amplifier used in the phase shift detector. It means to replace the comparator and the offset calibration in the previous topic. By taking advantage of a chopper to lower the offset voltage of the entire amplifier, and a ripple reduction loop to clamp the ripple at the output, it can reduce the offset voltage down to 10 V. The gain error is 2.7 %. In addition, the amplitude of the ripple is 4.7 mV.
||Ya-Hsin, Hsueh - chair|
Tzu-Chao, Chuang - co-chair
Ko-Chi, Kuo - co-chair
Chua-Chin, Wang - advisor
Indicate in-campus at 2 year and off-campus access at 2 year.|
|Date of Submission