Memory Input Noise Removal Circuit for Notch and Glitch Filtering
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Solution Overview
Problem
Noise such as notches and glitches in data input signals for memory devices, caused by impedance mismatching and power drops, lead to malfunctions in memory chips, which existing technologies fail to effectively remove.
Innovation Solution
A noise sense removing circuit is implemented, comprising a falling edge signal delaying circuit, a falling edge sensing circuit, a flip-flop, and logic operation circuits to detect and remove notches and glitches from the input signal, generating a clean clock signal for normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an input buffering section amplifies the input control signal to a digital level, then the signal level is improved for digital processing, but noise such as notches and glitches is also amplified and causes malfunctions
Solution Approach 1:
A noise removing circuit is introduced as an intermediary component between the input buffering section and the clock generator. This circuit detects notches and glitches in the buffered signal and removes them before the signal reaches the clock generator, preventing malfunctions while preserving the digital signal level improvement.
Solution Approach 2:
The noise removing circuit uses feedback mechanisms to detect abnormal signal transitions (notches and glitches) and correct them. By monitoring the buffered signal and comparing it against expected transition patterns, the circuit identifies and removes noise components that would otherwise cause operational malfunctions.
2Reliability
If a noise removing circuit is added to detect and remove notches and glitches, then reliability is improved, but device complexity increases
Solution Approach 1:
The noise removing circuit is segmented into distinct functional modules: a notch detecting unit that identifies notch phenomena, a glitch detecting unit that identifies glitch phenomena, and a signal processing unit that removes detected noise. This segmentation allows each module to perform a specific function efficiently, improving reliability while keeping the overall circuit design manageable through modular organization.
Data Source
AI summary
A circuit for removing noise from an input signal includes a falling edge signal delaying circuit configured to output a first delay output signal generated by delaying a falling edge of a first output signal for a preset time; a falling edge sensing circuit configured to sense the falling edge of the first output signal, and generate a pulse signal in accordance with the sense; a flip-flop configured to output the first delay output signal in accordance with an input clock signal; and a first logic operation circuit configured to perform a logic operation on an output signal of the flip-flop and the first output signal delayed for the preset time, thereby generating a second output signal.