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View Code? Open in Web Editor NEWA handy RF amplifier/attenuator tool for the bench. Based on a Hittite HMC625B.
License: MIT License
A handy RF amplifier/attenuator tool for the bench. Based on a Hittite HMC625B.
License: MIT License
The seven segment display multiplexing is found to create lots of switching noise on the RF output.
The stm32 runs the seven segment on 3.3V rail and causes di/dt when digit FETs are switched on/off. This noise couples upstream into the 5V regulator's output and leaks into the Vbias of the amplifier.
Two things were needed to eliminate this on the first revision:
Additional improvement ideas:
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