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Jeff Shepard

Basic principles of thermal management

December 24, 2020 By Jeff Shepard

Thermal management is a critical element in all types of electronic equipment. There are three general aspects to thermal management; heat transfer, temperature measurements, and managing the coefficients of thermal expansion of the various materials and components used in an electronic assembly. At the most basic level, thermal management involves applying the science of heat […]

Filed Under: FAQ, Featured, Power Electronic Tips Tagged With: FAQ

mmWave antennas and antenna management for 5G

December 23, 2020 By Jeff Shepard

mmwave

Antennas, antennas, and more antennas are one of the keys to successfully developing 5G new radio (NR) devices employing millimeter wave (mmWave) bandwidths. 5G NR handsets are highly complex devices. They have to handle the new 5G mmWave bands, including 4×4 multiple input and multiple output (MIMO) antennas, 3GPP specified Evolved Universal Terrestrial Radio Access […]

Filed Under: Analog IC Tips, Applications, FAQ, Featured, Telecommunications, Wireless Tagged With: FAQ

What is the 5G RF/mmWave signal chain?

December 22, 2020 By Jeff Shepard

The 5G RF/mmWave signal chain is expected to be the same as, and different from, the RF signal chain for today’s LTE Advanced devices. 5G consists of two separate frequency bands, FR1 is mostly repurposed LTE bands and FR2 bands are in the mmWave region. As a result, 5G in the FR1 frequencies can use […]

Filed Under: Analog IC Tips, Applications, FAQ, Featured, Telecommunications, Wireless Tagged With: FAQ

Basics of mmWave and its applications

December 21, 2020 By Jeff Shepard

The millimeter band spans from 30 to 300 gigahertz (GHz) and lies between the super high frequency band, and the far infrared band, the lower part of which is the terahertz band. Radio waves in this band have wavelengths from ten to one millimeter; thus, radiation in this band is called millimeter waves, sometimes abbreviated […]

Filed Under: Analog IC Tips, Applications, FAQ, Featured, Telecommunications, Wireless Tagged With: FAQ

What are RF inductors?

December 16, 2020 By Jeff Shepard

Radio frequency (RF) inductors have several uses and are available in various construction types to suit the performance needs of specific applications. Matching, resonators, and chokes are common uses for inductors in RF circuits. Matching involves eliminating impedance mismatches and minimizing reflection and losses in the lines between circuit blocks such as the antenna and […]

Filed Under: Analog IC Tips, Applications, FAQ, Featured, Telecommunications, Wireless Tagged With: FAQ

The basics of AC motor drives and controllers

December 11, 2020 By Jeff Shepard

AC drives are used to bring about the process and quality improvements in industrial and commercial applications’ acceleration, flow, monitoring, pressure, speed, temperature, tension, and torque. Most basic AC drives include a rectifier section, a DC link, an inverter, and a control section, usually based on a microcontroller or microprocessor. There are several drive topologies […]

Filed Under: Applications, FAQ, Featured, Power Electronic Tips Tagged With: FAQ

The basics of AC motors and their applications

December 10, 2020 By Jeff Shepard

The two main types of AC motors are induction motors and synchronous motors. The induction motor (or asynchronous motor) always relies on a small difference in speed between the stator rotating magnetic field. The rotor shaft speed is called slip to induce rotor current in the rotor AC winding. As a result, the induction motor […]

Filed Under: FAQ, Featured, Power Electronic Tips Tagged With: FAQ

Driving brushed and brushless DC motors

December 9, 2020 By Jeff Shepard

DC motors are available in various electrical configurations and, except for brushless DC (BLDC) motors, are relatively simple devices. As a result, driving brushed DC motors is a relatively simple process. As shown below, BLDC motors require a more sophisticated approach. A “motor drive” is not even necessary with brushed dc (BDC) motors in some […]

Filed Under: FAQ, Featured, Power Electronic Tips Tagged With: FAQ

Testing power consumption and batteries for wireless IoT nodes and wearables – Virtual Roundtable (part 2)

December 8, 2020 By Jeff Shepard

In this second part of EEWorld’s virtual round table on testing power consumption and batteries for wireless IoT nodes and wearables, our panelists delve into the nuances of complementary cumulative distribution function (CCDF) testing and predicting actual battery performance. Our panelists include: Janet Ooi (JO), IoT Industry Solutions Lead at Keysight Technologies, Shah Hassan (SH), […]

Filed Under: FAQ, Featured, Power Electronic Tips Tagged With: FAQ

Motor fundamentals and DC motors

December 8, 2020 By Jeff Shepard

Motors use the principles of electromagnetism to convert electrical energy into mechanical energy. There are a wide variety of electrical configurations and mechanical constructions used to produce electric motors. A fundamental difference between various types of motors is whether the input voltage is AC or DC.  However, that differentiation immediately becomes a little fuzzy since […]

Filed Under: FAQ, Featured, Power Electronic Tips Tagged With: FAQ

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