I want a clock synthesizer which generates two outputs. One is 4 GHz and one is 2 GHz with 2 GHz signal 90 degrees phase shifted as shown in attached diagram. Does analog devices have any such solution?
Dear A4 speaker,
Depending on the number of outputs desired, the HMC7044 is a good option. It's possible that one of the RF PLLs (with the ADF prefix) will also be able to do that. I'm not sure because I handle the lower frequency (AD95xx) PLLs.
HMC7044 supports up to 3.2GHz, is not suitable for 4GHz. LTC6952 is similar to HMC7044 and supports up to 4.5GHz. It does not have an internal VCO, so an external VCO is required.
As a second option, LTC6953 which is a clock distribution part can be used together with a 4GHz PLL. ADF4351 is a good candidate here. These two options will provide exactly the required 90degree phase difference starting from the first edges.
If you do not need this alignment from the first edge (cares only steady state condition), you can use ADF4351 to generate both 4GHz and 2GHz together, and shift the phase of 2GHz externally. Please check ADF4351, it has two outputs and one of outputs can be divided by output divider - very suitable for your application.
HMC988 is a good candidate to shift the phase of 2GHz signal. Alternatively microstrip line (passive components) or an active all pass filter can be used for this purpose.
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