Semiconductor Switch Circuit for IC Leakage Current Cutoff
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Solution Overview
Problem
Monolithic integrated circuits with multiple digital and/or analog subcircuits experience significant leakage current even when not in use, leading to reduced operating time in battery-supplied systems, as unused subcircuits continue to draw power.
Innovation Solution
A monolithic integrated circuit design incorporating a semiconductor switch, a constant current source, and a capacitor, where the semiconductor switch is used to selectively turn off unused load circuits, minimizing leakage current by controlling the supply voltage and integrating a threshold switch to manage the switching process, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple digital and/or analog subcircuits are integrated in a monolithic integrated circuit, then the functionality and versatility of the circuit is improved, but the leakage current increases significantly even when subcircuits are not in use
Solution Approach 1:
The monolithic integrated circuit is divided into multiple independently controllable subcircuits, each with its own semiconductor switch. This segmentation allows individual subcircuits to be turned off when not in use, preventing their leakage current from contributing to the total power consumption while maintaining the overall functionality of the integrated circuit.
Solution Approach 2:
The circuit employs dynamic control of semiconductor switches to adjust the operational state of subcircuits based on actual usage requirements. The switches can transition subcircuits between active and inactive states, dynamically optimizing the balance between functionality and power consumption by eliminating leakage current from unused portions.
2Duration of action of moving object
If semiconductor switches are used to turn off unused subcircuits, then the leakage current is reduced and operating time is extended, but the device complexity increases
Solution Approach 1:
The semiconductor switches are monolithically integrated together with the subcircuits they control into a single integrated circuit structure. This merging combines the benefits of switch-based power management (reduced leakage current, extended operating time) with the advantages of monolithic integration (reduced overall complexity, simplified manufacturing, compact size) by eliminating the need for separate discrete switch components.
3Reliability
If the capacitor is connected to the control input of the semiconductor switch, then the switching process is controlled and surge peaks are limited, but the circuit complexity increases
Solution Approach 1:
The capacitor is monolithically integrated with the semiconductor switch and control circuitry, forming a unified control structure. This integration achieves reliable surge peak limiting and controlled switching behavior while maintaining the compact, simplified architecture of a monolithic integrated circuit, avoiding the complexity of separate discrete RC timing circuits.
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 minimizes leakage current, extending the operating time of battery-supplied systems by ensuring only necessary subcircuits are active, while maintaining reliable operation and reducing power consumption during sleep modes.
Implementation Method 1
a capacitor (CI), which is connected to the control input (G) of the semiconductor switch (Mps)
Implementation Method 2
a constant current source (CS1), which is connected to the control input (G) of the semiconductor switch (Mps)
Data Source
AI summary
A monolithic integrated circuit is provided that includes a semiconductor switch, a constant current source, a capacitor, and a load circuit, which has a load capacitance. An output of the semiconductor switch is connected to the load circuit to turn on and off a supply voltage of the load circuit. The capacitor is connected to the output of the semiconductor switch and to a control input of the semiconductor switch. The constant current source can be or is connected to the control input of the semiconductor switch. Also, a use of a semiconductor switch is provided to reduce the leakage current of a load circuit of a monolithic integrated circuit.