Low-Power IC Protection Circuit for Autonomous Wake-Up
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Solution Overview
Problem
Designing an integrated circuit (IC) that balances ultra-low power consumption with high voltage capability and robust electromagnetic compatibility (EMC) has proven challenging, particularly due to high start-up resistance and additional current draw from EMC protection, which is impractical in applications like stand-alone sensors that require autonomous wake-up operations.
Innovation Solution
An integrated circuit (IC) is developed with a low-power mode control circuit and a protection device comprising a depletion transistor or junction field effect transistor (JFET) coupled between the supply voltage and an oscillator, managing power consumption and providing EMC protection by controlling a wake/sleep cycle and reducing current consumption through a Schottky diode and high-voltage transistor configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection device with high-voltage transistor is used to provide EMC immunity, then voltage capability and EMC robustness are improved, but start-up current and power consumption increase
Solution Approach 1:
The protection device dynamically switches between high-impedance state during normal low-power operation and low-impedance state during high-voltage events. The circuit transitions from blocking mode (high impedance) to conducting mode (low impedance) when voltage exceeds the breakdown threshold, providing EMC protection only when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The circuit changes its electrical parameters (impedance, current flow) based on the applied voltage level. At normal operating voltages, the protection device maintains high impedance to minimize leakage current. When subjected to high-voltage transients, the parameter changes to low impedance to shunt the transient current, providing EMC protection.
2Reliability
If a large starting resistance is used to limit current at high voltage, then voltage capability is improved, but current consumption increases significantly
Solution Approach 1:
The circuit uses dynamic impedance switching rather than a fixed large resistance. During normal operation, the impedance is kept low to minimize current consumption. When high voltage is applied, the impedance dynamically increases to limit current, providing voltage capability without continuous energy loss.
Solution Approach 2:
The protection device is pre-configured with breakdown diodes that will automatically activate to limit voltage before excessive current can flow. This preliminary protective action prevents the need for continuous large resistance, as the voltage clamping occurs only when needed.
3Use of energy by moving object
If standby operation is used to reduce power consumption, then power consumption is reduced, but external standby signals and pins are required
Solution Approach 1:
The circuit uses self-service wake-up mechanisms where the protection device and oscillator automatically detect voltage presence and initiate operation without external triggers. The breakdown diodes self-activate when voltage exceeds the threshold, and the oscillator automatically starts, eliminating the need for external standby control signals and pins.
Solution Approach 2:
The circuit performs preliminary detection of voltage conditions through the breakdown diodes, which are always monitoring the voltage level. When the voltage threshold is reached, the wake-up action has already been triggered, eliminating the need for external standby control and enabling autonomous operation.
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 enables ultra-low power operation with high EMC robustness, reducing current consumption and eliminating additional current draw for EMC protection, while allowing for autonomous wake-up and efficient operation across a range of voltages, thereby addressing the limitations of conventional IC designs.
Implementation Method 1
The protection device comprises at least one transistor being one of a depletion transistor or a junction field effect transistor
Data Source
AI summary
Embodiments relate to integrated circuits with protection. In one embodiment the protection is coupled between a first circuit provided to control a low power mode of the integrated circuit and a supply voltage. The protection comprises in an embodiment a transistor being one of a depletion transistor or a junction field effect transistor.