Dynamic Current Voltage Comparator for Fast Low-Power Response
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Solution Overview
Problem
Conventional voltage comparators have a fixed response speed due to a constant reference current, which limits their performance in both steady-state and transition periods, failing to meet the requirements of low power consumption and fast response.
Innovation Solution
A voltage comparator design that includes a reference current source and a transient current source, where the transient current source dynamically adjusts the current based on the transition of the target voltage, providing minimal current during steady-state conditions and increasing current during voltage transitions to enhance response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the reference current is increased to improve response speed, then the response speed of the voltage comparator is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the reference current adjustable rather than fixed. The control circuit dynamically changes the reference current based on the operating state (steady-state or transition) of the voltage comparator, allowing the system to adapt between low power consumption and fast response requirements
Solution Approach 2:
The patent changes the parameter of reference current from a constant value to a variable value that can be adjusted between a first reference current (for fast response during transitions) and a second reference current (for low power consumption during steady-state), resolving the contradiction between speed and energy usage
2Use of energy by moving object
If the reference current is decreased to reduce power consumption, then the power consumption is reduced, but the response speed is limited
Solution Approach 1:
The patent uses periodic action by applying different reference current levels at different times: using the first (larger) reference current during transition periods when fast response is needed, and switching to the second (smaller) reference current during steady-state periods when power consumption is the priority
Solution Approach 2:
The control circuit dynamically switches between two reference current values based on the detected state of the voltage comparator, enabling the system to have fast response capability when needed while maintaining low power consumption during normal operation
Data Source
AI summary
A voltage comparator and an operation method thereof are provided. The voltage comparator includes an amplifying circuit, a reference current source, and a transient current source. A first input terminal and a second input terminal of the amplifying circuit respectively receive a first corresponding voltage corresponding to a target voltage and a reference voltage. The reference current source is coupled to the amplifying circuit to provide a reference current. The transient current source is coupled to the amplifying circuit to selectively provide a transient current. The transient current source detects a transition of a second corresponding voltage corresponding to the target voltage to dynamically adjust the transient current. Therefore, when a rapidly increasing voltage occurs in the target voltage, the transient current source may temporarily increase the current of the amplifying circuit, thereby accelerating the response speed of the amplifying circuit.