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Application of Integration: Problem Solving01:30

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The process of breathing involves the periodic intake and expulsion of air, known as the respiratory cycle, which typically lasts about five seconds. Modeling the volume of air inhaled into the lungs as a function of time provides insight into both the dynamics and efficiency of pulmonary ventilation. This volume is determined by integrating the airflow rate over time, which captures the cumulative effect of air entering the lungs.Sinusoidal Model of AirflowAirflow during respiration is not...
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Hydrostatic force is a fluid's total force at rest on a surface. For a horizontal surface submerged at a fixed depth, the pressure is constant and calculated as the product of fluid density, gravitational acceleration, and depth. In the case of a vertical dam wall submerged in water, this force is not evenly distributed due to the increasing pressure with depth. This variation arises from the cumulative weight of the water above each point. Integration is used to account for the continuous...
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Rotational equilibrium provides a natural framework for defining the center of mass of a system. For a plank balanced on a pivot with two unequal masses, equilibrium is achieved when the net torque about the pivot is zero. Torque is defined as the product of a force and its perpendicular distance from the pivot. When the torques due to all forces cancel, the pivot coincides with the center of mass of the system.For a system composed of several discrete point masses, the center of mass lies at...
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Blood flow through a cylindrical blood vessel can be mathematically described using the principles of laminar flow, a regime in which fluid moves smoothly in parallel layers. In this model, the velocity of the blood is not uniform across the cross-section of the vessel; rather, it varies with the radial distance from the center. The maximum velocity occurs along the central axis, decreasing progressively toward the vessel walls, where it reaches zero due to viscous drag.Approximating Blood...
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Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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CMOS-Integrated Low-Noise Junction Field-Effect Transistors for Bioelectronic Applications.

Daniel A Fleischer1, Siddharth Shekar2, Shanshan Dai3

  • 1Electrical Engineering Department, Columbia University, New York, NY 10027 USA (shepard@ee.columbia.edu.

IEEE Electron Device Letters : a Publication of the IEEE Electron Devices Society
|January 23, 2019
PubMed
Summary
This summary is machine-generated.

We developed low-noise junction field-effect transistors (JFETs) in a standard CMOS process. These JFETs significantly reduce input noise in integrated circuits, benefiting bioelectronic applications.

Keywords:
1/f noiseJFET circuitsbiopotential amplifierselectrophysiology

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Area of Science:

  • Integrated circuit design
  • Semiconductor device physics
  • Bioelectronics

Background:

  • Flicker noise in electronic devices is a significant challenge, particularly in sensitive applications like bioelectronics.
  • Conventional n-channel MOS devices suffer from high input-referred noise due to oxide interfaces.
  • Reducing noise in integrated circuits is crucial for improving signal-to-noise ratio and device performance.

Purpose of the Study:

  • To develop and characterize a low-noise junction field-effect transistor (JFET) integrated within a standard CMOS process.
  • To demonstrate the noise reduction capabilities of these novel JFETs compared to traditional MOS devices.
  • To evaluate the impact of JFET integration on the noise performance of CMOS operational amplifiers.

Main Methods:

  • Fabrication of JFETs using a standard 0.18 µm CMOS process.
  • Characterization of JFET performance, focusing on input-referred flicker noise.
  • Comparison of noise performance between JFETs and equally sized n-channel MOS devices.
  • Integration of JFETs into the input stage of CMOS operational amplifiers and subsequent noise analysis.

Main Results:

  • The developed CMOS-integrated JFETs exhibit over a factor of 10 reduction in input-referred flicker noise power compared to n-channel MOS devices.
  • Elimination of oxide interfaces in contact with the JFET channel is key to the observed noise reduction.
  • Integration of JFETs at the input of CMOS operational amplifiers resulted in a factor of 10 reduction in input-referred noise.

Conclusions:

  • CMOS-integrated JFETs offer a significant advancement in low-noise electronic device design.
  • The elimination of critical oxide interfaces leads to superior noise performance.
  • These low-noise JFETs are highly promising for improving the performance of integrated circuits in bioelectronics and other noise-sensitive applications.