Thesis
Low-power low-noise DC-coupled sensor amplifier IC
Washington State University
Master of Science (MS), Washington State University
2008
Handle:
https://hdl.handle.net/2376/103262
Abstract
A DC-coupled low-power low-noise sensor amplifier IC for recording neural activities in the brain of mice is designed, fabricated and measured. To acquire neural signals at different locations of the brain simultaneously through implanted electrode array, this multi-channel sensor amplifier chip has 16 independent channels. Each channel has a programmable gain ranging from 5 to 250, a DC offset cancellation range from - 0.3 V to + 0.3 V, and a bandwidth from DC to 7 KHz. With a power supply of +/- 1.5 V, the power dissipation is 1 mW per channel. The measured input referred noise integrated from 1 Hz to 7 KHz is 2.1 µV. Die area is 5x3 mm2 in TSMC’s 0.25µ CMOS process. Another version of the sensor amplifier IC using chopping amplifier and a different DC offset cancellation scheme is also designed, simulated and laid out. Simulations show that the same functions (programmable gain, DC offset cancellation range, etc.) are achieved while noise, power dissipation and die area are significantly reduced. The simulated input referred noise integrated from 1 Hz to 7 KHz is 1.7 µV. With a supply voltage of +/- 1.2 V, power dissipation is reduced to 0.34 mW per channel. Die area is 2x3 mm2 in TSMC’s 0.25µ CMOS process.
Metrics
5 File views/ downloads
17 Record Views
Details
- Title
- Low-power low-noise DC-coupled sensor amplifier IC
- Creators
- Wei Zheng
- Contributors
- George S. La Rue (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Electrical Engineering and Computer Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525056901842
- Language
- English
- Resource Type
- Thesis