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But Pll lock is released by low temperature. What should I do? Is it the right sequence? Sorry to hear you're having trouble keeping the HMC phase locked over temperature. I'll try to help based on the information provided. So at 13GHz at RFout, 6. Operating in integer mode. Loop stability may be one part of the problem. Reducing the PFD frequency pulls the corner of the loop filter in and increases the in-band phase noise. This may also degrade the phase margin which should ideally fall between degrees over temperature in order to remain stable.
A phase margin of 55 deg is a good place to start to insure loop is very stable over temp. After powering up should send REG01 to initialize all registers to their default values.
This provides enough margin for the PVT variation. Generally speaking this loop configuration isn't the best as it may not always allow the very low end of the band to be reached 2V. E not use Reserved. See REG08  as well. Refer to. Log in. Site Search Log in. RF and Microwave. RF and Microwave requires membership for participation - click to join. Share More Cancel. I wonder HMC I am using HMC Reply Cancel Cancel.
Thank you for your answer. I wonder a few more questions. Are you the same with me? Our registration is as below. Is there a problem with the registration value of the data sheet? I wait you answer. Hi there, Sorry to hear you're having trouble keeping the HMC phase locked over temperature. Evaluation of your register values:. See REG08  as well Is there a problem with the registration value of the data sheet?
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