Comparator Circuit Current Control to Suppress Switching Glitches
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Solution Overview
Problem
Existing comparator circuits face challenges in reducing current consumption while minimizing the generation of glitches during switching, particularly in low current consumption modes.
Innovation Solution
A comparator circuit design incorporating a comparison core circuit, a monitor circuit unit, and a nonlinear amplification circuit unit, where the monitor circuit stops current flow when the second voltage is higher, and the nonlinear amplification circuit amplifies current in a nonlinear manner to supply the comparison core circuit, effectively managing current consumption and suppressing glitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If current flow is stopped to the differential amplifier in low current consumption mode, then current consumption is reduced, but glitch generation occurs during switching transitions
Solution Approach 1:
A monitor circuit is introduced as an intermediary element that detects the output state of the differential amplifier and controls the switching timing. The monitor circuit generates a monitor signal that triggers the switch circuit to deactivate the constant current circuit at the precise moment when the differential amplifier output reaches a stable state, thereby preventing glitch generation while enabling current consumption reduction.
Solution Approach 2:
The monitor circuit establishes a feedback mechanism by continuously monitoring the differential amplifier output and using this information to control the switch circuit. The feedback loop ensures that current is stopped only when the output is stable, creating a self-regulating system that balances current consumption reduction with glitch suppression.
2Use of energy by moving object
If switch circuit is activated and deactivated to change current amount, then current consumption is controlled, but glitches are generated during switching
Solution Approach 1:
The monitor circuit performs preliminary detection of the differential amplifier output state before the switch circuit actually deactivates the constant current circuit. By anticipating the optimal switching moment through continuous monitoring, the system prepares the switching action in advance, ensuring it occurs at the precise moment when output stability is achieved, thus preventing glitches.
Solution Approach 2:
The patent replaces direct mechanical switching control with an electronic monitoring and control system. Instead of using a simple timing-based or manual switch control, the monitor circuit electronically detects the amplifier output state and automatically triggers the switch circuit, substituting a sophisticated electronic control mechanism for simpler switching methods.
3Reliability
If constant current circuit supplies current continuously, then differential amplifier operates stably, but current consumption increases
Solution Approach 1:
The system transitions from a static constant current supply to a dynamic current control mechanism. The constant current circuit operates continuously only when needed for stable amplification, and is deactivated when the output reaches a stable state or during low current consumption modes. The switch circuit dynamically adjusts current flow based on real-time output conditions, optimizing the balance between stability and energy efficiency.
Solution Approach 2:
The monitor circuit detects when the differential amplifier output has reached a stable state, at which point the constant current supply can be discarded (deactivated) to reduce current consumption. The system recovers by reactivating the constant current circuit when the output transitions again, ensuring stability is maintained only when necessary while minimizing overall current consumption.
Data Source
AI summary
A comparator circuit for reducing current consumption in a low consumption mode while suppressing the generation of glitches during a transitional period. The comparator circuit includes a comparison core circuit unit, a monitor circuit unit formed by a first transistor, and a nonlinear amplification circuit. The comparison core circuit includes second and third transistors connected to a constant current source. The source terminal and gate terminal of the first transistor have the same connection as the source terminal and gate terminal of the third transistor. The current flowing to the first transistor is supplied to the nonlinear amplification circuit. The nonlinear amplification circuit amplifies the supplied current with an incorporated constant current source and supplies the amplified current to the source terminals of the second and third transistors of the comparison core circuit.