TAILIEUCHUNG - Ebook Analog circuit design: Part 2

(BQ) Part 1 book "Analog circuit design" has contents: Enhanced ripple regulators, design methodology and circuit techniques for any load stable ldos with instant load regulation and low noise; design methodology and circuit techniques for any load stable ldos with instant load regulation and low noise,.and other contents. | Integrated Amplifier Architectures for Efficient Coupling to the Nervous System Timothy Denison, Gregory Molnar and Reid R. Harrison Abstract Monitoring the electrical activity of multiple neurons in the brain could enable a wide range of scientific and clinical endeavors. An enabling technology for neural monitoring is the interface amplifier. Current amplifier research is focused on two paradigms of chronically sensing neural activity: one is the measurement of ‘spike’ signals from individual neurons to provide high-fidelity control signals for neuroprosthesis, while the other is the measurement of bandpower fluctuations from cell ensembles that convey general information like the intention to move. In both measurement techniques, efforts to merge neural recording arrays with integrated electronics have revealed significant circuit design challenges. For example, weak neural signals, on the order of tens of microvolts rms, must be amplified prior to analysis and are often co-located with frequencies dominated by 1/ f and popcorn noise in CMOS technologies. To insure the highest fidelity measurement, micropower chopper stabilization is often required to provide immunity from this excess noise. Another difficulty is that strict power constraints place severe limitations on the signal processing, algorithms and telemetry capabilities available in a practical system. These constraints motivate the design of the interface amplifier as part of a total system–level solution. In particular, the system solutions we pursued are driven by the key neural signal of interest, and we use the characteristics of the neural code guide the partitioning of the signal chain. To illustrate the generality of this design philosophy, we discuss state-of-the-art design examples from a spike-based, single-cell system, and a field potential, ensemble neuronal measurement system, both intended for practical and robust neuroprosthesis applications. 1 Introduction to Neural Sensing The measurement of .

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