Ferroelectric Capacitor Memory Cell for Battery-Free Event Recording
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Solution Overview
Problem
Existing memory technologies require an independent power source to monitor and record events over extended periods, increasing costs due to battery replacement and power consumption, especially in environments where power is only available during event occurrences.
Innovation Solution
A memory cell utilizing a ferroelectric capacitor with variable impedance and a feedback circuit that switches polarization states based on applied potential differences, allowing for event recording without external power and low power consumption during readout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If an independent power source (battery) is provided to power the memory and maintain the circuitry in a monitoring state, then the memory can monitor the line over an extended period of time and record events, but the cost increases due to battery replacement and power consumption
Solution Approach 1:
The memory circuit uses the event signal itself as the power source. When an event occurs and a signal is present on the line, the circuit automatically powers up, captures the event, and then powers down. No external battery or independent power source is required - the circuit serves itself by harvesting power from the signals it monitors.
Solution Approach 2:
The memory circuit operates in periodic cycles: it remains in a low-power standby state, activates only when an event signal is detected, performs the capture operation, and then returns to standby. This periodic on-demand operation eliminates continuous power consumption while maintaining extended monitoring capability.
2Duration of action of stationary object
If an independent power source is provided to maintain the memory in a monitoring state, then the memory can record events over extended periods, but the device complexity increases due to battery management requirements
Solution Approach 1:
The circuit automatically detects the presence of an event signal and uses that signal to trigger power-up and capture operations. The system self-manages its power state transitions without requiring external battery management circuitry, microcontrollers, or complex power control logic.
Solution Approach 2:
The independent power source (battery) and its associated management infrastructure are completely removed from the system. The patent extracts the power management function entirely, replacing it with a signal-triggered power architecture that eliminates batteries, charging circuits, and power management ICs.
3Use of energy by moving object
If conventional memory technology is used without an independent power source, then power consumption is reduced, but the ability to maintain memory state and record events over extended periods is lost
Solution Approach 1:
The patent employs a variable impedance element whose impedance state changes based on the captured event data. This impedance change creates a stable, readable memory state that persists without power. The parameter change in impedance encodes the event information in a way that maintains reliability without requiring continuous power supply.
Solution Approach 2:
The patent replaces traditional volatile memory mechanisms (which require continuous power to maintain state) with a passive impedance-based storage mechanism. The event information is stored as a physical impedance state in the circuit rather than as electrical charges in capacitive memory cells, eliminating the need for power to maintain the recorded state.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables event monitoring and recording over extended periods without an independent power source, reducing costs and power consumption, with the memory cell resetting to a reflective state upon power application, ensuring accurate data retrieval.
Implementation Method 1
a memory cell utilizing a ferroelectric capacitor with variable impedance and a feedback circuit that switches polarization states based on applied potential differences
Data Source
AI summary
A memory cell comprising a ferroelectric capacitor, a variable impedance element and a conductive load is disclosed. The ferroelectric capacitor, characterized by first and second polarization states, is connected between a control terminal and a first switch terminal. The variable impedance element has an impedance between the first and second switch terminals that is determined by a signal on a control terminal. The conductive load is connected between a first power terminal and the first switch terminal. The second switch terminal is connected to a second power terminal. When a potential difference is applied between the first and second power terminals, a potential on the first switch terminal varies in a manner determined by the state of polarization of the ferroelectric capacitor.