Abstract
Rapid development in miniature implantable electronics are expediting advances in neuroscience by allowing observation and control of neural activities. The first stage of an implantable biosignal recording system, a low-noise biopotential amplifier (BPA), is critical to the overall power and noise performance of the system. In order to integrate a large number of front-end amplifiers in multichannel implantable systems, the power consumption of each amplifier must be minimized. This paper introduces a closed-loop complementary-input amplifier, which has a bandwidth of 0.05 Hz to 10.5 kHz, an input-referred noise of 2.2 μ V rms , and a power dissipation of 12 μ W. As a point of comparison, a standard telescopic-cascode closed-loop amplifier with a 0.4 Hz to 8.5 kHz bandwidth, input-referred noise of 3.2 μ V rms , and power dissipation of 12.5 μ W is presented. Also for comparison, we show results from an open-loop complementary-input amplifier that exhibits an input-referred noise of 3.6 μ V rms while consuming 800 nW of power. The two closed-loop amplifiers are fabricated in a 0.13 μ m CMOS process. The open-loop amplifier is fabricated in a 0.5 μ m SOI-BiCMOS process. All three amplifiers operate with a 1 V supply.
Original language | English (US) |
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Article number | 6129415 |
Pages (from-to) | 344-355 |
Number of pages | 12 |
Journal | IEEE transactions on biomedical circuits and systems |
Volume | 6 |
Issue number | 4 |
DOIs | |
State | Published - 2012 |
Externally published | Yes |
Keywords
- Analog integrated circuits
- biopotential amplifier
- biosignal amplifier
- low noise
- low-power circuit design
- neural amplifier
- noise efficiency factor