Decoupling of power supply circuits of analog and digital channels. Scheme, description

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Decoupling of power supply circuits of analog and digital channels. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Radio amateur designer

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The decoupling of the power supply circuits of analog and digital channels can be performed according to the diagram shown in the figure. The 5 V voltage for powering all nodes is stabilized by one DA1 chip.

Decoupling of power supply circuits of analog and digital channels

The peculiarity is that the chokes L1 and L2 decouple both the positive power supply circuits of digital and analog nodes (VCC and AVCC) and the circuits of their common wire (GND and AGND).

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Thanks to research at the Oregon State University College of Engineering, MDM (metal-dielectric-metal) diodes are one step closer to being used in real devices. Three years ago, the university announced the first successful high-speed MDM diode and continues to be a world leader in this technology.

MDM-type diodes (MIM - metal-insulator-metal) are a "sandwich" of two metals with two dielectrics between them. This allows electrons to tunnel through the dielectrics and emerge almost instantly from the other side. Now researchers have found that adding a second dielectric allows for "stepping tunneling" - a situation in which an electron can only tunnel through one dielectric, rather than two. This, in turn, allows precise control of asymmetry, diode non-linearity, and rectification at low voltages.

"This approach allows us to improve device performance by creating additional tunneling barrier asymmetry," said University professor John Conley. "This gives us another way to organize quantum mechanical tunneling and brings us closer to the real devices that will become possible with this technology." .

MDM devices consist of four layers (from left to right): amorphous zirconium, hafnium oxide, alumina, and aluminium. The image was obtained using a transmission electron microscope.

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"MDM diodes are faster devices than silicon chips and can be produced on a huge scale at low cost from inexpensive and environmentally friendly materials," the university says.

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