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  • Implementation of a DSP-based 20-bit High Resolution Quasi-Absolute Encoder for Low-Speed Feedback Control Applications - White Paper (.pdf)
    Absolute encoders using optical technology often face limitations in resolution and size. For example, to achieve a higher resolution of up to 16-bits, the absolute encoder has to be combined with an incremental pattern that is strongly interpolated with an external hardware and sig¬nal
  • Virtual Absolute™ Technology
    , this initialization angle is less than 2° of shaft rotation; in a 16-bit encoder, it's about 0.3°.) From then on, the encoder is truly absolute, in the sense of both #1 and #2 above. During its initialization period, the encoder generates a WAIT signal; once it's initialized, it generates a DATA VALID
  • How Does an Optical Encoder Work?
    . encoders can provide absolute position. number of turns is usually 12 bits (212 =. values over a 360° range. After one turn the. 4096). measuring range is completed and it starts. Code Discs. over again. The resolution (number of. position values over the 360° range) can be. as high as 16 bits (216
  • KEELOQ (R) Encoders Oscillator Calibration
    is sufficiently small to allow us to. show any absolute frequency reference values. Neither. achieve a calibration of ±10% or better. the f fastest frequency nor the f slowest frequency are. given (in fact, we would not need any calibration if the. two values were fixed and known). Further, the slope
  • How To Substantially Reduce Encoder Cost While Gaining Functionality With Multi-Turn Rotary Position Sensors (.pdf)
    Many applications require rotation counters that can measure angles greater. than 360º. However the low-cost 10-turn potentiometers most design engineers. are familiar with can't always meet user requirements for resolution and reliability. As an alternative, optical absolute encoders are too
  • Servo Control of a DC Brush Motor
    high speed peripherals. Further, the on-chip peripherals allow an absolute minimum cost system to be constructed. Closed-loop servo motor control is usually handled by 16-bit, high-end microcontrollers and external logic. In an attempt to increase performance many applications are upgrading to DSPs
  • Adaptive Differential Pulse Code Modulation using the PIC16/17
    the sign bit of the ADPCM code (t), if necessary,. if(diff >= 0). and find the absolute value of difference (d). code = 0;. else. {. code = 8;. diff = - diff;. }. 6. Save quantizer step size (q) in a temporary. tempstep = step;. variable. 7. Quantize the difference (d) into the ADPCM code. if(diff
  • Agilent: Five Hints for Debugging Microcontroller-Based Designs
    algorithms in motion. control systems require position. and/or velocity feedback. This. feedback can come from many. sources, including analog signals,. absolute position encoders, and. quadrature encoders. This hint refers. channel A that leads the pulse output. to quadrature encoders, which offer