Jeff Shepard

California

Technology Analyst, Commentator and Writer at Freelance

Contributing Writer at EEWorld Online

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Articles

What tools are available for calibrating sensors?

4 days ago | designworldonline.com | Jeff Shepard |Jeff Shepard

Tools used for calibrating sensors range from basic multimeters and multi-product calibrators to application-specific tools, like pressure calibrators, calibration baths, and infrared blackbody calibrators, depending on the type of sensor and the measurement requirements. As sensors get more sophisticated and precise, so do the tools used to calibrate them. Sensors require calibration to deliver consistent accuracy.
VCSEL: Understanding Vertical Cavity Surface-Emitting Lasers

1 week ago | eeworldonline.com | Jeff Shepard

A vertical cavity surface-emitting laser (VCSEL) relies on a three-dimensional (3D) structure for light emission. A photonic crystal surface-emitting laser (PCSEL) incorporates a 2D photonic crystal (PhC) layer to manipulate light emission. Those structural differences lead to different performance and application possibilities. An obvious difference between the various types of semiconductor lasers is the beam patterns.
What are the foundations of Maxwell’s equations and how do they relate to TENGs?

1 week ago | eeworldonline.com | Jeff Shepard

Gauss’s law for electricity, Gauss’s law for magnetism, Faraday’s law of induction, and Ampère’s circuital law are the foundations of Maxwell’s equations. But Maxwell saw what wasn’t there. He added a term to one of the equations, providing a single mathematical model for electric, optical, and radio technologies and changing scientists’ understanding of the world.
What is the HPC memory wall and how can you climb over it?

2 weeks ago | eeworldonline.com | Jeff Shepard

The high-performance computing (HPC) memory wall generally refers to the growing disparity between processor speed and memory bandwidth. When processor performance outpaces memory access speeds, this creates a bottleneck in overall system performance, particularly in memory-intensive applications like artificial intelligence (AI).
What is the maths of positive feedback and how it is used in electronic systems?

3 weeks ago | eeworldonline.com | Jeff Shepard

Positive feedback is primarily used to rapidly amplify a desired change or signal, often in situations where a large response is needed, like triggering a process to reach a specific threshold quickly. It must be carefully managed due to its potential for instability and runaway effects. It’s used in digital electronics to force voltages away from intermediate voltages into “0” and “1” states. Figure 1 shows a simplified view of an industrial control system.
What kinematic equations are important for industrial robots?

3 weeks ago | eeworldonline.com | Jeff Shepard

A kinematic model is a mathematical representation of a robot’s motion that focuses on the geometric relationships between elements and ignores external forces that affect motion. Kinematic models are used for planning and controlling the paths of industrial robots. Forward kinematics determines the end effector’s current position and orientation based on the angles of each joint in the robot arm.
Precoding Techniques for Better Signal Quality

3 weeks ago | eeworldonline.com | Jeff Shepard

Precoding is a signal processing technique that modifies the phases and amplitudes of wireless signals to combat channel distortion and optimize the quality and reliability of data transmissions. It can support beamforming in multiple-input, multiple-output (MIMO) and massive MIMO antenna arrays. This article reviews some of the benefits of precoding, examines how it’s implemented, briefly compares analog, linear, and non-linear precoding, and concludes by discussing hybrid precoding.
What’s the relationship between Ohm’s Law and quantum mechanics?

4 weeks ago | eeworldonline.com | Jeff Shepard

Ohm’s Law is the classical physics explanation of the linear relationship between voltage, current, and resistance in a conductor. Quantum mechanics provides insights into the mechanisms behind this behavior, explaining why Ohm’s Law still holds true even on very small scales where quantum effects are significant. Ohm’s law is a macroscopic view of classical physical relationships.
How are single photon sensors used in quantum computing?

1 month ago | eeworldonline.com | Jeff Shepard

Single-photon sensors, also known as single-photon detectors (SPDs), enable the precise detection and manipulation of individual photons, which can serve as quantum information carriers, or qubits, in photonic quantum computers (PQCs). PQCs are a type of measurement-based quantum computing (MBQC) that promises highly scalable systems and operates at room temperature.
What are the foundations of Maxwell’s equations and how do they relate to TENGs?

1 month ago | powerelectronictips.com | Jeff Shepard

Gauss’s law for electricity, Gauss’s law for magnetism, Faraday’s law of induction, and Ampère’s circuital law are the foundations of Maxwell’s equations. But Maxwell saw what wasn’t there. He added a term to one of the equations, providing a single mathematical model for electric, optical, and radio technologies and changing scientists’ understanding of the world.