20th May 2008, 07:01 pm
In industrial applications, a digital-to-analog (D-to-A) interface may be rather straightforward but the analog-to-digital (A-to-D) converter (ADC) can be a challenge. The capacitive input stage of both delta-sigma and successive approximation register (SAR) interfaces used for the ADC requires signal capture within a limited time frame. An improper signal chain can cause ringing and oscillation and result in inaccurate readings. However, this is just one of many factors to consider when selecting an ADC.
Signal Chain
High-performance ADCs convert the output of an analog sensor to a digital format for a microcontroller or digital signal processor. The selection of the ADC must be part of a systems approach. “When somebody starts a design, you start with the sensor, you see what kind of output impedance it has and you choose an amplifier and resistors around the amplifier and you choose that configuration based on your sensor,” says Chuck Sins, applications engineer, National Semiconductor. “Based on the accuracy of your sensor and what you are ultimately trying to achieve, then I choose the resolution of the ADC.”
Continue reading ‘Signal Conditioning Issues’ »
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3rd May 2008, 08:09 pm
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30th January 2008, 03:03 pm
Motion suit eliminates need for multiple camerasAt the 2008 Consumer Electronics Show here in Las Vegas, Xsens Technologies B.V. yesterday demonstrated a motion capture suit that eliminates the need for multiple cameras and optical markers.
Known as the Moven motion capture system, the new suit incorporates three Analog Devices gyroscopic sensors, three accelerometers, three magnetometers and an Analog Devices Blackfin digital signal processor (DSP). All of the sensors reside in a small module that measures approximately 2 inches x 1 inch and fits under a motion suit. One suit incorporates 16 of the sensors modules. Using the company’s software, motions are captured and displayed on a PC screen.
“We’re adding software algorithms to handle data from the sensors and apply it to a biomechanical model of a human being,” says Gerben Groothuis, director of marketing and sales for Xsens.
Continue reading ‘Motion Suit Could Simplify Biomechanics Studies’ »
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