Circuit Arrangement for Low-Current Energy-Saving Transitions
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Solution Overview
Problem
Integrated circuits face challenges in achieving rapid energy-saving modes with low current consumption during transitions, which is crucial for contactless systems like smart cards, as existing methods either increase complexity, area, or result in high static current consumption due to requirements for varying threshold voltages.
Innovation Solution
The circuit arrangement includes a switch and a voltage source controlled by a control device to vary the potential of a terminal, disconnecting it from the supply voltage during energy-saving modes to minimize leakage currents and using CMOS technologies with high threshold voltages for low current consumption, while ensuring rapid transitions between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the circuit enters energy-saving mode by disconnecting the supply voltage, then current consumption is reduced, but voltage transitions during mode switching cause high current flow
Solution Approach 1:
The circuit proactively detects when a transition to energy-saving mode is intended and preemptively raises the potential of the second terminal before disconnecting the supply voltage. This preliminary action prevents high current flow from occurring in the first place by ensuring the voltage difference is minimized before the switch opens, thereby resolving the contradiction between low current consumption and preventing high current transitions.
2Use of energy by moving object
If the circuit uses CMOS technologies with high threshold voltages, then current consumption during energy-saving mode is reduced, but transition speed to normal operation decreases
Solution Approach 1:
The circuit raises the potential of the second terminal in advance before switching modes, so that when the supply voltage is reconnected during wake-up, the voltage difference is already minimized. This preliminary preparation enables fast transition speeds without requiring low-threshold-voltage CMOS devices, thus maintaining low current consumption while achieving rapid mode transitions.
3Speed
If the circuit rapidly transitions between operating modes, then responsiveness is improved, but voltage drops and erroneous interpretations may occur
Solution Approach 1:
The circuit proactively adjusts the potential of the second terminal before mode transitions occur, preparing the voltage state in advance. This preliminary voltage adjustment prevents supply voltage drops and erroneous interpretations during rapid transitions, thereby maintaining both fast transition speeds and high operational reliability in contactless systems.
Data Source
AI summary
In accordance with one embodiment, a circuit arrangement is provided including a circuit having a first terminal for a first supply potential and a second terminal for a second supply potential, wherein the first terminal is coupled to the first supply potential; a switch, by means of which the second terminal can be coupled to the second supply potential; a voltage source coupled to the second terminal; and a control device designed to open the switch in reaction to receiving a turn-off signal in an operating mode in which the switch is closed, and subsequently to control the voltage source in such a way that it varies the potential of the second terminal in the direction of the first supply potential.