Or do I need a programmable waveform generator such as the AD9833 to connect to the HMC832A and send the triangular signal.
The HMC832A can modulate the output either using SPI updates or changing reference frequency. Both methods have limitations...
Consider a dedicated sweeper PLL like HMC703 or ADF4159. These parts can synthesize triangular outputs using internal sweeper circuits. Since these are PLL devices the frequency deviation is only limited by the VCO range. For example with HMC632 VCO a triangular output from 14.25 GHz to 15.65 GHz is possible.
So if I was to send a 7 MHz triangular reference signal to the HMC832A, I wouldn't be able to get generate an rf signal between 1500 MHz to 3000 MHz?
If not would it be better to use a VCO chip (JTOS-2000) instead?
Thanks for your recommendations.
Can the ADF4159 be programmed with an arduino board?
The following is not possible because of the HMC832A switched capacitor VCO architecture:
If you continuously update N to synthesis a 1500 MHz to 3000 MHz sweep the part will lose lock on every update as autocal runs. You can turn off autocal and sweep using manual tuning but the HMC832A will still lose lock crossing integer boundaries (every 7 MHz) and on every update to the switch capacitor selection (every 25 Mhz). The result is a sweep with poor linearity.
The best solution is use the JTOS-2000 VCO with HMC703 or ADF4159. Both of these parts can be programed with an Arduino board. While sweeping the part remains in lock resulting in good linearity. In the following example I've set the sweep time to 1ms but this is configurable.
Thanks, do you know a simulation software that has a model of the ADF4159 chip as I am planning to use this chip to build a FMCW Radar and would like to simulate on the computer first along with other chips before building it?
You can use our ADIsimPLL to simulate your waveform( download from our web page) , start with the ADF4159 reference design, and in the time domain panel select "modulation" for type and "triangle" for modulation.
Thanks but I'm looking for a software similar to the ADIsimPE. ADIsimPE doesn't have the ADF4159 chip in its model library. Is there any other software that has this chip, or would I have to build it from scratch on LTSpice?
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