Power Distributor Switching Reservoir Capacitor Leakage Current
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Solution Overview
Problem
Semiconductor memory devices face issues with high-speed operation at low voltage, leading to noise-induced errors due to small inductance and high leakage current from reservoir capacitors with thin dielectrics, which are necessary for high capacitance but increase power consumption.
Innovation Solution
A power distributor with a large reservoir capacitor and a switching unit controlled by a controller, which turns on or off based on the operation state of a circuit block to manage electrical connections and minimize leakage current, using a stack capacitor with a thin dielectric for high capacitance within a limited area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a reservoir capacitor with a thin dielectric is used to increase capacitance, then the capacitance increases, but the leakage current increases
Solution Approach 1:
The patent applies the dynamics principle by making the connection between the reservoir capacitor and power supply line controllable rather than fixed. A switching unit is introduced that can dynamically connect or disconnect the capacitor based on operational requirements, allowing the system to optimize between capacitance utilization and leakage current reduction in different operating states
Solution Approach 2:
The patent implements periodic action through the switching unit that periodically connects and disconnects the reservoir capacitor from the power supply line. The controller activates the switching unit based on detected operation modes, creating periodic connection/disconnection cycles that allow the capacitor to serve its noise filtering function when needed while minimizing leakage current during idle or low-power states
2Object-affected harmful factors
If a large reservoir capacitor is used to reduce low frequency noise, then the noise reduction improves, but the leakage current becomes significant
Solution Approach 1:
The system dynamically controls the engagement of the large reservoir capacitor with the power supply line through a switching unit. During operation modes where low frequency noise is problematic, the capacitor is connected to provide noise filtering. During power-down, stand-by, or refresh modes, the capacitor is disconnected to eliminate unnecessary leakage current
Solution Approach 2:
The patent extracts the large reservoir capacitor from the continuous power supply connection and places it under controlled intermittent connection. The switching unit acts as an intermediary that separates the capacitor from the power supply line when its noise reduction function is not required, effectively removing the source of leakage current while preserving the capacitor's noise filtering capability when needed
3Quantity of substance
If the dielectric thickness is reduced to increase capacitance, then the capacitance increases, but the power consumption increases
Solution Approach 1:
The system dynamically manages the power consumption of the high-capacitance capacitor by controlling its electrical connection state. The switching unit, under controller direction, connects the capacitor during high-power consumption modes (active operation) and disconnects it during low-power modes (power-down, stand-by, refresh), thereby reducing overall power consumption while maintaining the capacitance benefit when needed
4Reliability
If a reservoir capacitor with high capacitance is used to minimize voltage drop, then the voltage stability improves, but the leakage current increases
Solution Approach 1:
The patent implements dynamic control of the reservoir capacitor connection to balance voltage stability and leakage current. The switching unit connects the capacitor during active operation modes where voltage stability is critical, and disconnects it during idle or low-power modes where the capacitor's voltage holding function is less critical, thereby reducing leakage current while maintaining voltage stability when required
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
The solution effectively reduces leakage current and noise by controlling the electrical connection between the power supply lines and the reservoir capacitor, optimizing power consumption and noise reduction in semiconductor memory devices.
Implementation Method 1
the capacitance of a reservoir capacitor at a peripheral circuit in a chip... the reservoir capacitor may be used in a power distributor to minimize a voltage drop due to power consumption
Implementation Method 2
the capacitance of a reservoir capacitor is in proportion to a surface area of an electrode and in inverse proportion to a thickness of a dielectric. Therefore, a thickness of a dielectric must be thin to obtain large capacitance in a given area
Data Source
AI summary
A power distributor includes a large reservoir capacitor, a switch coupled between at least one power supply line and the large reservoir capacitor, and a controller configured to turn on or off the switch based on whether a circuit block connected to the power supply line is in operation or not.