Guard Ring Layout at Brian Schurman blog

Guard Ring Layout. Most analog designs use an extended tap structure called a “guard ring”. Guard rings are large taps that completely enclose a group of devices. For device isolation purposes, create strong ohmic contact with the substrate or well. A guard ring, designed to encircle the input node, helps to sink stray current away from the sensitive node. Guard rings more effectively isolate devices from each other by creating a low resistance ring in the well/substrate around the group. Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential very close to that of the inputs. The ring must be tied to a low.

Figure 1 from GuardRing Structures for Silicon Photomultipliers
from www.semanticscholar.org

For device isolation purposes, create strong ohmic contact with the substrate or well. The ring must be tied to a low. Most analog designs use an extended tap structure called a “guard ring”. Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential very close to that of the inputs. Guard rings are large taps that completely enclose a group of devices. A guard ring, designed to encircle the input node, helps to sink stray current away from the sensitive node. Guard rings more effectively isolate devices from each other by creating a low resistance ring in the well/substrate around the group.

Figure 1 from GuardRing Structures for Silicon Photomultipliers

Guard Ring Layout The ring must be tied to a low. Guard rings are large taps that completely enclose a group of devices. The ring must be tied to a low. Guard rings more effectively isolate devices from each other by creating a low resistance ring in the well/substrate around the group. A guard ring, designed to encircle the input node, helps to sink stray current away from the sensitive node. Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential very close to that of the inputs. For device isolation purposes, create strong ohmic contact with the substrate or well. Most analog designs use an extended tap structure called a “guard ring”.

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