Differential Signal Receiver With Adaptive Reference Noise Filtering
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Solution Overview
Problem
In dynamic random access memory (DRAM), the reduction in signal amplitude to reduce transition time and power consumption makes signals less tolerant to noise, leading to data misjudgment and incorrect data reception.
Innovation Solution
A signal receiving circuit comprising an operational amplifier circuit and a voltage offset adjustment circuit, where the voltage offset adjustment circuit provides an offset voltage to adjust the reference voltage based on the noise or amplitude range of the differential signal, allowing the operational amplifier to effectively filter out noise and prevent signal misjudgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the signal amplitude is reduced to decrease transition time and power consumption, then the transition time and power consumption are reduced, but the signal becomes less tolerant to noise causing data misjudgment
Solution Approach 1:
The patent introduces a reference voltage as an intermediary element that mediates between the differential signal and the decision threshold. By adjusting the reference voltage to track the common-mode voltage, the system creates a dynamic baseline that compensates for noise, allowing low-amplitude signals to be reliably distinguished from noise without increasing signal amplitude
Solution Approach 2:
The patent dynamically changes the reference voltage parameter based on the common-mode voltage level and noise characteristics. By making the reference voltage adaptive rather than fixed, the system can maintain optimal discrimination threshold despite variations in signal amplitude and noise levels, resolving the contradiction between low amplitude operation and noise tolerance
2Use of energy by moving object
If the signal amplitude is reduced to decrease power consumption, then the power consumption is reduced, but the signal becomes less tolerant to noise causing data misjudgment
Solution Approach 1:
The reference voltage acts as a mediator that enables reliable signal detection at low power consumption levels. By dynamically adjusting the reference voltage to account for noise and common-mode variations, the system maintains accurate signal discrimination without needing to increase signal amplitude, thus preserving low power operation while improving noise tolerance
Solution Approach 2:
The system dynamically adjusts the reference voltage parameter to maintain optimal signal-to-noise discrimination at reduced signal amplitudes. This parameter adaptation allows the system to operate at lower power consumption levels while compensating for the reduced noise margin through intelligent threshold adjustment
Data Source
AI summary
A signal receiving circuit and a noise filtering method thereof are provided. The signal receiving circuit includes an operational amplifier circuit and a voltage offset adjustment circuit. A first input terminal and a second input terminal of the operational amplifier circuit receive a differential signal, a third input terminal receives a reference voltage, and the operational amplifier circuit compares the differential signal with the reference voltage to generate an output signal. The voltage offset adjustment circuit is coupled to the third input terminal of the operational amplifier circuit, and provides an offset voltage to adjust the reference voltage.