Mode-Switching Buffer Circuit for Noise-Induced Glitch Suppression
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Solution Overview
Problem
Existing buffer circuits in semiconductor apparatuses are prone to glitches and noise, leading to erroneous outputs and temporary system malfunctions, and existing methods for filtering glitches are inadequate.
Innovation Solution
A buffer circuit with a power control circuit, inverting circuit, and voltage adjustment circuit that dynamically adjusts power supply voltages based on input signals and mode signals to stabilize output signals, operating in either a Schmitt trigger inverter mode or a general inverter mode to minimize noise impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a general buffer circuit is used to amplify and buffer input signals, then the circuit can generate output signals efficiently, but it is prone to glitches and noise that cause erroneous outputs
Solution Approach 1:
The buffer circuit dynamically switches between two operation modes (first operation mode and second operation mode) based on the input signal characteristics. The mode selection circuit determines whether to operate in a high-speed amplification mode or a noise-filtering mode, allowing the circuit to adapt its behavior to different signal conditions and thereby resolve the contradiction between productivity and reliability.
Solution Approach 2:
The circuit changes its operational parameters by switching between different operation modes. In the first operation mode, the circuit parameters are optimized for high-speed signal amplification, while in the second operation mode, the parameters are adjusted to filter out glitches and noise. This parameter switching enables the circuit to achieve both high productivity and high reliability depending on the signal conditions.
2Reliability
If noise filtering methods are applied to eliminate glitches, then output reliability improves, but circuit complexity increases
Solution Approach 1:
The buffer circuit is designed with multi-functionality by integrating both signal amplification and noise filtering capabilities within a single circuit structure. The mode selection circuit enables the same circuit to perform different functions (high-speed amplification or noise filtering) based on the operation mode, avoiding the need for separate filtering circuits and thereby reducing overall complexity while maintaining reliability.
Solution Approach 2:
The buffer circuit performs self-diagnosis and self-adjustment through the mode selection circuit, which automatically determines the appropriate operation mode based on the input signal characteristics. This self-service mechanism eliminates the need for external control circuits or manual intervention, achieving reliable noise filtering without adding significant circuit complexity.
3Object-affected harmful factors
If voltage levels are dynamically adjusted based on input signals, then noise resistance improves, but power consumption increases
Solution Approach 1:
The voltage levels are dynamically adjusted only when necessary, based on the operation mode selected by the mode selection circuit. In the first operation mode, the circuit operates with standard voltage levels for efficient power consumption, while in the second operation mode, voltage levels are adjusted to enhance noise resistance. This dynamic adjustment ensures that power consumption increases only when noise filtering is actually needed.
Solution Approach 2:
The voltage adjustment occurs periodically or intermittently based on the input signal characteristics rather than continuously. The mode selection circuit triggers voltage level changes only when transitioning between operation modes, allowing the circuit to maintain lower power consumption during stable operation while still providing noise resistance when required by the signal conditions.
Data Source
AI summary
A buffer circuit includes a power control circuit, an inverting circuit, and a voltage adjustment circuit. The power control circuit is configured to provide voltages based on an input signal and a mode signal, and the inverting circuit is configured to receive and invert the voltages to generate an output signal. The voltage adjustment circuit is configured to adjust voltage levels based on the mode signal and the output signal.