Ring Oscillator Power-On Detection for Minimum Frequency Thresholds
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Solution Overview
Problem
Conventional power detection circuits lack precision in determining the minimum power level required for device operation, leading to inefficiencies in power usage and potential operational failures due to inaccurate power-on thresholds.
Innovation Solution
A power-on detection circuit utilizing a ring oscillator and high pass filter to generate an oscillating signal, which, when reaching a certain frequency, triggers a logic signal through a rectification device, accurately determining the minimum operational frequency for power-on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional power detection circuit using a resistor ratio is used, then the circuit structure is simple, but the power detection precision is insufficient
Solution Approach 1:
The patent changes the detection parameter from voltage ratio to frequency. The ring oscillator's oscillation frequency changes with supply voltage, and by detecting this frequency, the circuit achieves precise power threshold detection. This parameter transformation resolves the contradiction by providing high precision without requiring complex resistor ratios.
Solution Approach 2:
The patent replaces the passive resistor-based voltage division system with an active oscillating system. The ring oscillator converts voltage information into frequency information, which is then detected by frequency-sensitive circuits. This substitution enables precise detection while maintaining circuit simplicity.
2Duration of action of moving object
If the power threshold is set too low, then more operational time is available, but energy is wasted due to inability to operate at higher power levels
Solution Approach 1:
The patent implements feedback through the ring oscillator's frequency response to supply voltage. The oscillator naturally adjusts its frequency based on the actual power level, providing real-time feedback about power sufficiency. This enables the system to accurately determine when power-on is possible without wasting energy on insufficient power conditions.
Solution Approach 2:
The patent uses the dynamic frequency response of the ring oscillator to adapt to changing power conditions. Rather than a fixed threshold, the system dynamically adjusts its detection criterion based on the oscillator's actual frequency, which varies with supply voltage. This dynamic approach optimizes both operational time and energy efficiency.
3Loss of energy
If the power threshold is set too high, then energy efficiency is improved, but potential operational time is lost
Solution Approach 1:
By changing from voltage-based to frequency-based detection, the system achieves a more accurate representation of actual power availability. The frequency parameter naturally scales with voltage, providing a proportional response that optimizes the threshold setting without arbitrary adjustments, thereby balancing energy efficiency and operational time.
4Measurement precision
If a frequency-based detection method is used, then power threshold detection precision is improved, but the circuit complexity increases
Solution Approach 1:
The patent merges the power detection function with the ring oscillator's natural frequency response. Instead of adding a separate detection mechanism, the oscillator itself serves as the detection element, with its frequency directly indicating power sufficiency. This merging achieves high precision while minimizing additional circuit complexity.
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 precise detection of the minimum power threshold, ensuring accurate power-on detection and optimizing energy usage by distinguishing between non-operational and operational states with high accuracy.
Implementation Method 1
a ring oscillator, for generating a first oscillating signal up to the upper threshold
Implementation Method 2
a high pass filter, coupled to the ring oscillator, for filtering the first oscillating signal to generate a second oscillating signal
Implementation Method 3
a capacitor, coupled between the resistor and the drain of the transistor, for storing charges when the second oscillating signal is not input to the rectification device and for discharging when the transistor is turned on by the second oscillating signal
Implementation Method 4
a transistor, having a gate coupled to the high pass filter and a source coupled to ground
Data Source
AI summary
A power-on detection circuit for detecting a minimum operational frequency includes: an oscillating circuit, which includes: a ring oscillator, for generating a first oscillating signal; and a high pass filter for filtering the first oscillating signal to generate a second oscillating signal. The power-on detection circuit also includes a rectification device, coupled to the high pass filter, for generating a logic signal once the second oscillating signal reaches a certain frequency.