Dynamic Bias Current Generator for Comparator Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing low power-consumption circuit designs face a dilemma in achieving high processing speed due to limited comparator speed, particularly during power-down or brown-out reset conditions, where a high-speed response is required to detect voltage drops without increasing power consumption.
Innovation Solution
A dynamic bias current generator is introduced, comprising a detection circuit and current generating circuits using transistors and capacitors to amplify the comparator's current, allowing for increased response speed while maintaining low power consumption by dynamically adjusting the bias current based on power supply voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lower bias current is applied to the comparator, then power consumption is reduced, but the comparator speed is limited
Solution Approach 1:
The patent implements a dynamic bias current generator that adjusts the comparator's bias current based on operating conditions. During normal operation, a lower bias current is used to minimize power consumption. During reset conditions (power-on reset, power-down reset, brown-out reset), the bias current is dynamically increased to enable high-speed voltage detection and rapid reset signal generation, thus resolving the contradiction between low power consumption and high speed requirements
Solution Approach 2:
The patent changes the bias current parameter dynamically based on the operational state of the comparator. By detecting reset conditions through voltage level monitoring, the system switches between different bias current levels, allowing the comparator to operate at low power during normal conditions and at high speed during critical reset events, thereby resolving the trade-off between power consumption and speed
2Speed
If a high bias current is applied to the comparator, then the response speed is increased, but power consumption increases
Solution Approach 1:
The dynamic bias current generator enables the comparator to switch between low and high bias current modes based on detected voltage conditions. During power-down or brown-out reset events, the system detects the voltage drop and dynamically increases the bias current to achieve rapid response. During normal operation, the bias current is maintained at a low level to minimize power consumption, thus resolving the contradiction between high response speed and low power consumption
Solution Approach 2:
The patent employs periodic monitoring of the power supply voltage through the detection circuit, which triggers dynamic bias current adjustment only when necessary (during reset conditions). This periodic detection and conditional response mechanism ensures high speed performance is achieved only when needed, while maintaining low power consumption during normal operation
Data Source
AI summary
A dynamic bias current generator includes a detection circuit and at least one current generating circuit. The detection circuit is used for generating a detection signal, and includes: current source coupled to the power supply voltage; a first set of transistors coupled between the current source and the ground voltage; a second set of transistors coupled between the power supply voltage and the ground voltage; a first capacitor coupled to the power supply voltage; and a second capacitor coupled to the ground voltage. The at least one current generating circuit is used for generating dynamic bias current according to the detection signal, and includes multiple transistors and a terminal for outputting voltage signal corresponding the dynamic bias current. The dynamic bias current may be used to increase the reaction speed of the comparator and may be used in a power down detection circuit.