UHF label antenna design guide from NXP, app note here (PDF!) This document provides a general overview on basics of UHF wave propagation, as well as practical considerations of UHF label antenna design. The target is to guide the reader to a good understanding of UHF label antenna design in theory and in practice.
Category Archives: app notes
App note: Hipot testing of magnetic components
High voltage test between two isolated coils for isolation handling an application note from Coilcraft. Link here (PDF) This application note discusses the purpose of hipot (high potential) testing and how the hipot test relates to inductor and transformer safety.
App note: SOLERIQ® L38
OSRAM’s filament looking LED application note. Link here (PDF) SOLERIQ® L38 (GW T3LxF1) is a filament LED with a beam angle of 360deg for indoor retrofit lighting applications. It combines the advantages of modern LED technology with the aesthetics of traditional light bulbs. The construction of the SOLERIQ® L38 consists of a ceramic based frame […]
App note: Magnetometer placement in mobile devices
Correct magnetometer placement app note from Kionix. Link here (PDF) Electronic devices contain many parts which can affect a magnetic sensor. When deciding the mounting position, it is necessary to consider the types of materials and the amount of current carried in proximity of the magnetic sensor. Accuracy of an electronic compass depends upon getting […]
App note: Embedded orientation detection using the MMA8450Q
NXP’s accelerometer chip MMA8450Q, provides orientation detection on handheld devices. Link here (PDF) This application note targets the portrait/landscape orientation detection feature which has become standard in many hand-held electronic devices. Additionally, this application note aims to explain uses as well as highlight some of the challenges of designing an embedded algorithm into the sensor. […]
App note: Practical considerations of Trench MOSFET stability when operating in linear mode
Practical considerations of Trench MOSFET stability when operating in linear mode, application note (PDF!) from Fairchild Semiconductor This application note focuses on the factors affecting the thermal instability condition of a trench MOSFET device in Linear Mode. In particular, it studies the phenomenon when the drain current (Id) focusing process occurs that leads to a localized […]
App note: Understanding linear resonant actuator characteristics
Application note about Linear Resonant Actuators from Precision Microdrives. Link here Linear Resonant Actuators (LRAs) are becoming more popular for haptic applications. They are an alternative to eccentric rotating mass vibration motors and have several distinct advantages. For example they have better haptic performance characteristics and are more efficient. For these reasons they are used […]
App note: Driving linear resonance vibration actuators
Linear resonance vibration actuators are great alternative to Eccentric rotating mass (ERM) motors, these are both used to vibrate handheld devices such as cellphones, driving LRAs is not the same as driving ERMs for such that LRA needs a specific resonant frequency. More on these on Precision Microdrives’ link here. Linear Resonance Actuators (LRA) use […]
App note: Between the Amplifier and the ADC – Managing filter loss in communications systems
An application note (PDF!) from TI on optimizing the filter design to minimize the losses: Filtering plays an essential part in nearly all communications systems. Removing unwanted signals is crucial to eliminate noise or distortion that could compromise the integrity of the data. Recently, I came across a discussion about a nouveau casino en ligne, which […]
App note: Implementing an I2C reset
Interesting app note from Analog Devices when an I2C communication is broken under some circumstances. Link here (PDF) The I2C bus is a high integrity, robust serial bus used for control purposes in many systems. The primary components that make up a system are at least one master and one slave. Under normal conditions, everything […]
App note: Environmental compensation on the AD7142: The effects of temperature and humidity on capacitance sensors
An old but useful application from Analog Devices about things that can affect touch/capacitance sensors. Link here (PDF) Capacitance sensing has the potential to replace current user input mechanisms in consumer devices. Products as diverse as cell phones, digital cameras, MP3 players, and other portable media players are all suitable for implementing capacitance sensing. Capacitance […]
App note: Implementing a line frequency meter
Circuit from Murata about line frequency measurement utilizing Murata’s DMS series digital voltmeters, LM2917 frequency-to-voltage converter and a transformer for isolation. Link here (PDF)
App note: Engineering scaling
Scaling large values to be fed on limited input digital meters, application note from Murata. Link here (PDF) It is oftentimes necessary to attenuate “large” input signals down to a level that more closely matches the input range of a selected meter. For example, suppose the signal to be measured is 19 Volts, and the input […]
App note: General overview of IR transmission in free ambient
Vishay’s general information about IR transmission in free ambient. Link here (PDF) Free ambient IR data transmission, IR remote control as well as most opto-electronic sensors and light barrier systems work with an optical wavelength between 870 nm and 950 nm. The emitter and detector components are highly efficient in this near IR wavelength band […]
App note: Using Vishay infrared receivers in a Wi-Fi environment
2.4Ghz and 5 Ghz Wi-fi signals can sometimes affect IR receivers, here’s Vishay’s app note about them. Link here (PDF) In recent years, Wi-Fi connectivity has penetrated most consumer electronic devices used for media reproduction. New TVs, satellite receiver and cable boxes, and streaming devices are more often than not built with Wi-Fi capabilities at […]
App note: High-speed level shifting using Si8XXX isolators
Silicon Lab’s Si86xx which provides digital isolation and voltage level shifting while Si823x as ISOdrivers, Link here (PDF) Voltage level shifting is common in analog and mixed-signal system applications. While several technologies implement level shifting (e.g., HVIC processes, discrete circuits, dedicated level shifting ICs), recent advances in CMOS isolation technology enables fast, reliable, and highly-integrated […]
App note: Novel current-sense measurement with automatic offset correction
Silicon Labs’ application note about a low power current measurement circuit using TS1001 nano power op-amp paired with low-power CY8C38 microcontroller, Link here (PDF) Pairing a simple circuit using nanopower analog op amps with a microcontroller can monitor single battery cells and solar harvesters. Pairing up a 0.65 V/1 µA nanopower op amp with the […]
App note: USB field firmware updates on MSP430 MCUs
TI’s application note: USB field firmware updates on MSP430 MCUs (PDF!) With the advent of USB, end users can perform firmware upgrades in the field by simply attaching the device via USB and executing an application on the host PC. Such an approach has numerous advantages: Problems discovered after product release can be fixed. Reduced […]
App note: Class D audio amplifier basics
Class D audio amplifier an efficient amplifier by Infineon Technologies, Link here A Class D audio amplifier is basically a switching amplifier or PWM amplifier. There are a number of different classes of amplifiers. This application note takes a look at the definitions for the main classifications.
App note: How to pick a click-and-pop suppressor
Audio noises click-and-pop suppression method from Maxim. Link here (PDF) This application note presents the MAX9890 and MAX9892 which use different approaches to remove audible click and pop from headphones. Each device is uniquely suited to different applications.