Integrator Circuit Charge Retention During Power Restarts
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Solution Overview
Problem
Conventional integrator circuits require significant time to charge and discharge capacitors when power supply voltage is stopped and restarted, which is problematic for high-speed operations and leads to increased power consumption.
Innovation Solution
Incorporating a transistor with a small off-state current in series with the capacitor in the integrator circuit, which is turned on during power supply and off when it is stopped, to minimize electric discharge and quicken capacitor charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply voltage is continuously supplied to the integrator circuit, then the circuit can operate normally, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the transistor's on/off state changeable based on operational needs. The transistor is turned on during operation periods to allow capacitor charging and turned off during non-operation periods to prevent discharge, enabling the circuit to dynamically adapt its power consumption state while maintaining reliability when needed.
2Use of energy by moving object
If power supply voltage is stopped during non-operation period, then power consumption is reduced, but electric charge in capacitor is discharged
Solution Approach 1:
The transistor serves as an intermediary element between the capacitor and the external circuit. When turned off, it acts as an ideal barrier that prevents charge discharge paths, allowing the capacitor to hold its charge even when power is stopped. This intermediary component enables the system to achieve both low power consumption and charge retention.
3Loss of time
If transistor with small off-state current is used, then electric discharge is reduced and capacitor charging time is shortened, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by selecting a transistor with specific off-state current characteristics (less than or equal to 1×10^-22 A/μm). This parameter specification enables the transistor to maintain charge effectively when off while still allowing rapid charging when on, resolving the time loss issue without requiring complex circuit modifications.
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
This approach reduces electric discharge during power supply interruptions, allowing for faster capacitor charging and reduced power consumption, especially during restarts.
Implementation Method 1
an off-state current per channel width of the transistor is less than or equal to 1×10−22 A/μm
Implementation Method 2
the capacitor is provided between an inverting input terminal and an output terminal of the differential amplifier circuit
Data Source
AI summary
A semiconductor device including an integrator circuit, in which electric discharge from a capacitor can be reduced to shorten time required for charging the capacitor in the case where supply of power supply voltage is stopped and restarted, and a method for driving the semiconductor device are provided. One embodiment has a structure in which a transistor with small off-state current is electrically connected in series to a capacitor in an integrator circuit. Further, in one embodiment of the present invention, a transistor with small off-state current is electrically connected in series to a capacitor in an integrator circuit; the transistor is on in a period during which power supply voltage is supplied; and the transistor is off in a period during which supply of the power supply voltage is stopped.