Microwave Diode Sampler for PLL
In this video, Gregory explains the working principles of a Microwave Diode Sampler used to downconvert the VCO signal in for a PLL design.
The 3.33GHz input signal is downconverted to a 12MHz IF, using a low-frequency LO of ~100MHz.
The diode sampler works on the time-domain, sub-sampling the microwave signal, thus aliasing the signal to a much lower IF. The sampling action is performed by a Schottky diode-bridge and a Step Recovery Diode pulse generator.
This design is part of the 10GHz signal source we are designing on the channel, and will be used in the phase-detector of the PLL.
Here you can see the sampler constructed working:
• 10GHz Microwave Source - project upda...
Learn more about the 10GHz signal source project:
• 10GHz Microwave Signal Source
00:25 - Introduction
03:00 - Working principle
06:52 - Circuit diagram
13:30 - Step Recovery Diode pulse generator
The full schematic of this sampler can be downloaded on the Patreon page.
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