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DDS DAC chip, adjustable frequency 500KHz ~ 5MHz
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Application background Mainly used in RFID, communications and other industries, for instance, digital sampling local oscillator signal, the signal of the receiver, and so on, can also be used as test a signal generator with adjustable amplitude, frequency source, very helpful for testing and design Key Technology Digital signal generator DDS; frequency adjustable. Using MATLAB to generate the relevant original data, according to the key to change the frequency control word, continuous accumulation, you can achieve the frequency can be adjusted. The generated binary code is sent to the data interface of the corresponding DAc chip, and the high order harmonics of the signal can be resolved through the filtering of the analog signal to the back end.
yuliang_1990 1 0
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FIR filter FPGA
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Application background & nbsp; FIR (fini te impulse response) filter is the most basic components of digital signal processing system, which can ensure any amplitude frequency characteristics at the same time a strictly linear phase frequency characteristics, and the unit impulse response is limited, no input to output feedback, the system is stable. Therefore, FIR filter is widely used in communication, image processing, pattern recognition and so on. Key Technology Before entering the FIR filter, first of all to the signal by a / D conversion chip analog to digital conversion, to become a 8bit digital signal, generally higher speed can be successive approximation type A / D converter, regardless of the multiply accumulate method or distributed algorithm is used to design FIR filter, filter output data are a bunch of sequence, so that it can be directly reflected, still need to through digital to analog conversion, so using FPGA FIR filter outpu
yuliang_1990 2 0
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4 24 times extracted CIC filter design
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Cascaded Integrator comb (CIC) filters are widely used in software radio, you can implement efficient filters for decimation or interpolation. It is mainly used to reduce or increase the sample rate. Main features of CIC filter is, using only addition, subtraction, and registers, small footprint, easy and high speed.
yuliang_1990 0 0
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