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Hello,
I want to achieve a frequency 2 entries with a fpga , the range of each entry is 0 Hz to 1 GHz ,
the measurement method is reciprocal , the Communicatin between the FPGA and the CPU is with spi bus,
the display is on an LCD touch screen .
I do not know how to choose the fpga and I want a sample code to perform frequency measurements.
the clock on the fpga is a 10 MHz OCXO oscillator. Thanks for your help. sebastien
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Hi Sebastien, I Fear you need write a more detailed description of what you wish to measure.
You said want use reciprocal method then set the requirement as 0 to 1GHz as frequency range, this result in an overflow, infinite measure time or division by zero on lowest range, so with a so wide input range you need plan in first how many digit of resolution where required by your application, reciprocal work better at low frequency not at upper range so when resolution of one method is lesser you have to think differently. If resolution need to be fine grained then again time of measure take the primary decision in both method and/or integrated by analog measurement of input signal.
OCXO has some parameter too, can you post model number or data of this main component?
please define what you wish to measure and application type. Max II I fear quit your application in range of 150MHz signals, you can choose a better device but this case IMHO is better embed processor than export data.
Happy new year
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