Resistance Memory Cell Parasitic Current Suppression

The patent introduces a two-terminal access device as an intermediary element between the read circuit and the resistance memory element. This access device acts as a mediator that selectively controls current flow: it remains non-conductive for unselected memory elements (blocking parasitic currents) and becomes conductive only when both word line and bit line are activated (allowing legitimate read current). This resolves the contradiction by providing measurement precision through parasitic current suppression while managing device complexity through controlled activation rather than permanent structural modification.

The access device exhibits dynamic behavior where its electrical characteristics change based on activation conditions. When the word line and bit line are both activated, the access device transitions from a non-conductive state to a conductive state, allowing current flow. This dynamic switching capability enables the system to differentiate between selected and unselected memory elements, suppressing parasitic currents during read operations while maintaining the ability to access legitimate data when needed.

The patent applies preliminary anti-action by using the access device to preemptively block parasitic current paths before they can interfere with the read operation. The access device is configured to remain non-conductive during read operations for unselected memory elements, preventing parasitic currents from altering the resistance state or interfering with the measurement. This preliminary prevention ensures that when a read operation is performed on a selected memory element, the measurement is accurate and the state is not inadvertently changed by unwanted current paths.

The system utilizes parameter changes in the access device's electrical characteristics based on activation state. When activated, the access device transitions to a conductive state with low resistance, allowing the read current to flow through the selected memory element. When not activated, it maintains a high-resistance non-conductive state. This parameter change enables precise control over when measurements occur and ensures that read operations only affect intended memory elements, maintaining both measurement precision and data integrity.