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fm modulation dds
Many of the ADI DDS chip are easy to perform AM modulation by changing the AMPLITUDE register, is there an easy way to perform the FM modulation?
Since the IO speed of the DDS chip is as fast as 100Mbps, is it possible to change the FREQUENCY register dynamicly according to...
Many of the ADI DDS chip are easy to perform AM modulation by changing the AMPLITUDE register, is there an easy way to perform the FM modulation?
Since the IO speed of the DDS chip is as fast as 100Mbps, is it possible to change the FREQUENCY register dynamicly according to the input...
sorry for figure1
thank you for your reply
the attachment is input circuit of HP-5386A Universal counter.
the input buffer is built with a 2N4416, a 400MHz fet.
slew-rate, input impedance seem not superior than an OP??
I found most of the Analog section in FreqCounter design use a FET as input impedance converter and amplitude amplfier, why not use some High-input-impedance OP? like opa655 which might be easier to adjust
dds function generator project
yes , the tektronix AFG320 is built using a DDS chip, but most of the DDS chip have only 10-bit waveform DAC, difficult to get low THD&S/N
also it's not easy to generate a FM signal using DDS chip.
if built with LUT + 16bit-DAC ,it would be very nice!
digital oscilloscope +fpga
any one have done a sample one?
i've made a acquisition board with 2*AD9215, and now writing code for UF32 USB-chip, next week the PCB might be OK
well , to control a heating system is not an easy thing, especially you want an accurate temp.
A closed-loop system is essential, and try some arithmetic like PID.
it usually take a long time to get a steady system:)
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