Signal Receiver Load Compensation for Reference Voltage Offset
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Solution Overview
Problem
Voltage offsets in the reference voltage of a signal receiver in memory modules affect the accuracy of data access by altering the duty cycle of output signals, posing a significant challenge in maintaining a constant DC level at the output node.
Innovation Solution
A signal receiver design incorporating a first and second transistor with a variable load, where the resistance of the load is adjusted by control signals generated based on the reference voltage level to maintain a constant DC level at the output node, utilizing MOS transistors in cascode configurations and a control signal generator to compensate for voltage offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference voltage is used in the signal receiver, then the signal reception function is enabled, but voltage offsets in the reference voltage cause duty cycle distortion and DC level variation at the output node
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual reference voltage level and generating compensation control signals based on the detected voltage offset. The control signals adjust the variable loads to counteract the offset effects, forming a closed-loop feedback system that maintains DC level stability despite reference voltage variations
Solution Approach 2:
The patent changes the resistance values of variable loads dynamically based on the detected reference voltage offset. By adjusting the resistance parameters of the variable loads in response to voltage offsets, the system compensates for duty cycle distortion and maintains constant DC level at the output node
2Measurement precision
If the resistance of variable load is adjusted to compensate voltage offset, then DC level stability is improved, but device complexity increases due to additional control circuitry
Solution Approach 1:
The patent divides the compensation function into separate modular components: a reference voltage detection unit, a control signal generation unit, and variable load adjustment units. Each component performs a specific function, making the overall complex system manageable and maintainable through functional segmentation
Solution Approach 2:
The patent introduces control signals as intermediary elements that mediate between the reference voltage detection and the variable load adjustment. These control signals serve as the communication bridge, translating voltage offset information into appropriate resistance adjustment commands without requiring direct complex interaction between components
Data Source
AI summary
A signal receiver includes a first input terminal, a second input terminal, a first transistor, a second transistor and a variable load. The first and the second transistors each include a gate electrode, a first electrode and a second electrode. The gate electrode of the first transistor is coupled to the first input signal terminal, the gate electrode of the second transistor is coupled to the second input signal terminal, and the variable load is coupled to the first electrode of the first transistor, where a resistance of the first variable load is adjusted to make a DC level at an output node of the signal receiver keep a constant value.