Active Suppression Circuit for DDR PDN Resonance Noise
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Solution Overview
Problem
Modern DDR memory systems face power supply noise issues due to resonance of the power delivery network, which traditional methods, such as passive snubber/damping circuits, are unsuitable for, especially in memory integrated circuits, as they require extensive manual tuning and occupy significant space, making them undesirable for on-chip integration.
Innovation Solution
An active suppression circuit is introduced, comprising an attenuator, low-pass filter, operational amplifier, driving stages, and a suppression device, which detects power noise thresholds and activates a shorting path between the power supply network and ground to absorb excess current, thereby suppressing noise efficiently and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive snubber/damping circuits are used to suppress power supply noise, then noise suppression is achieved, but the circuit occupies significant space and requires extensive manual tuning
Solution Approach 1:
The patent replaces passive mechanical/snubber circuits with an active electronic suppression circuit that uses operational amplifiers, transistors, and capacitors to detect and counteract power supply noise. This substitution enables noise suppression functionality to be integrated into the memory circuit without occupying significant additional space, as the active circuit components can be compactly arranged on the same chip.
Solution Approach 2:
The active suppression circuit automatically detects power supply noise through its sensing mechanism and activates the suppression transistor to counteract the noise without requiring external manual tuning. The circuit self-regulates by comparing the power supply voltage against a reference and activating the suppression path only when noise is detected, eliminating the need for manual adjustment while maintaining compact integration.
2Object-affected harmful factors
If passive snubber/damping circuits are used to suppress power supply noise, then noise suppression is achieved, but extensive manual tuning is required
Solution Approach 1:
The active suppression circuit incorporates automatic detection and response mechanisms that eliminate the need for manual tuning. The operational amplifier continuously monitors the power supply voltage and automatically activates the suppression transistor when noise is detected, making the circuit self-adjusting and suitable for automated manufacturing processes without requiring manual calibration.
Solution Approach 2:
The circuit employs feedback mechanisms where the power supply noise is detected and fed back to the operational amplifier, which then adjusts the suppression transistor activation accordingly. This closed-loop feedback system automatically adapts to different noise conditions without requiring manual tuning, enabling easy manufacturing and integration.
3Object-affected harmful factors
If a shorting path is activated to suppress power noise, then noise suppression is effective, but power consumption increases
Solution Approach 1:
The active suppression circuit activates the shorting path periodically and only when power supply noise is detected, rather than continuously. The operational amplifier monitors the power supply voltage and triggers the suppression transistor only during noise events, thereby achieving effective noise suppression while minimizing power consumption by keeping the suppression path inactive during normal operation.
Solution Approach 2:
The circuit applies suppression action only partially - specifically when and where needed (during noise events) rather than continuously. The suppression transistor is activated only for the duration and intensity required to counteract detected noise, avoiding excessive power consumption while maintaining effective noise suppression during critical periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The active suppression circuit effectively reduces power supply noise and improves power integrity in memory systems by selectively activating a low-impedance path only during noise events, ensuring minimal power draw and compact on-die integration.
Implementation Method 1
power supply noise caused by resonance of a power delivery network (PDN)
Data Source
AI summary
Various embodiments provide for active suppression circuitry. The active suppression circuitry can be used with a circuit for a memory system, such as a dual data rate (DDR) memory system. For example, some embodiments provide an active suppression integrated circuit. The active suppression integrated circuit can be used by a memory system to efficiently suppress power supply noise caused by resonance of a power delivery network (PDN) of the memory system, thereby improving power integrity of the memory system input/output.