Noise Detection Circuit for Stable DLL and Duty Cycle Correction
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Solution Overview
Problem
Integrated circuit chips are prone to malfunctions due to noise in voltages, particularly affecting clock-based circuits like DLL and DCC, which can cause operational disruptions.
Innovation Solution
A noise detection circuit comprising delay and divider units, and a detection unit that compares delayed and divided periodic waves to generate a noise detection signal, which is used to stabilize clock-based circuits by ignoring noise detection signals during noise occurrence, preventing updates to delay or duty correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noise detection is implemented using delay and divider units, then noise detection capability is improved, but device complexity increases
Solution Approach 1:
The noise detection circuit is segmented into multiple functional units: delay units (110_1, 110_2), divider units (120_1, 120_2), and a detection unit (130). Each unit performs a specific function, allowing the complex detection task to be divided into manageable segments that can be independently designed and analyzed.
Solution Approach 2:
The circuit uses two parallel paths with identical structures (delay unit + divider unit) to create copies of the same functional block. These copied units process the periodic wave differently (one path delays first then divides, the other divides first then delays) to generate comparable output signals for noise detection.
2Measurement precision
If delay units and divider units are added to detect noise, then detection precision is improved, but device complexity increases
Solution Approach 1:
The detection unit compares the output signals from the two parallel paths and generates a noise detection signal based on the comparison result. This feedback mechanism allows the circuit to continuously monitor for noise conditions and respond appropriately, improving detection precision through systematic signal comparison.
Solution Approach 2:
The delay units and divider units perform preliminary processing of the periodic wave before comparison. By pre-processing the signal through different sequences of delay and division operations, the circuit prepares the signals in advance for accurate noise detection, enabling early identification of noise conditions.
3Reliability
If noise detection signal is used to control DLL updates, then reliability is improved, but device complexity increases
Solution Approach 1:
The noise detection signal acts as an intermediary between the noise detection circuit and the DLL control logic. This intermediate signal provides a clear binary indication of noise presence that can be easily integrated into the existing DLL control mechanism, bridging the gap between the detection function and the control function without requiring complex direct integration.
Solution Approach 2:
The DLL control logic dynamically adjusts its behavior based on the noise detection signal. When noise is detected, the DLL ignores phase comparison signals and maintains current delay values; when no noise is present, it normally updates delay values based on phase comparison. This dynamic response improves reliability by adapting the control behavior to noise conditions.
4Reliability
If noise detection circuit is integrated into DCC, then circuit stability is improved, but device complexity increases
Solution Approach 1:
The noise detection circuit is designed as a universal module that can be integrated into different clock control circuits such as DLL and DCC. The same delay units, divider units, and detection unit structure serves multiple functions across different applications, reducing overall system complexity through component sharing and standardization.
Data Source
AI summary
A noise detection circuit includes a first delay unit suitable for delaying a periodic wave to output a delayed periodic wave, a first divider unit suitable for dividing the delayed periodic wave to output a first periodic wave, a second divider unit suitable for dividing the periodic wave to output a divided periodic wave, a second delay unit suitable for delaying the divided periodic wave to output a second periodic wave, and a detection unit suitable for comparing the first periodic wave with the second periodic wave and outputting a noise detection signal.