Sense Amplifier Offset Control Across Test and Normal Modes
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Solution Overview
Problem
Conventional semiconductor receiver circuits face inefficiencies due to nonlinear characteristics and increased resource overhead from mismatched transistors and differential drain current, requiring multiple digital-to-analog converters and additional transistors for offset voltage adjustment, which complicates signal routing and increases circuit area.
Innovation Solution
A receiver circuit with a variable converter that outputs offset control voltages in different ranges based on a test mode activation signal, reducing the number of transistors needed in the sense amplifier and simplifying offset voltage generation, thereby improving operating characteristics and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple digital-to-analog converters are used to provide offset voltages in different ranges, then the receiver can operate in different modes (eye monitoring test mode and normal mode), but the device complexity and resource overhead increase
Solution Approach 1:
The patent applies universality by designing a single digital-to-analog converter that can serve multiple functions through selective activation. The converter is configured to operate in different ranges (first range for eye monitoring test mode, second range for normal mode) by controlling the activation of specific circuits based on the operating mode, eliminating the need for separate converters for each mode.
2Manufacturing precision
If the number of transistors is increased in the off-set voltage adjust units to compensate for nonlinear characteristics, then the signal transmission accuracy improves, but the area of the sense amplifier increases
Solution Approach 1:
The patent applies parameter changes by varying the output voltage range of the digital-to-analog converter based on the operating mode. In eye monitoring test mode, the converter operates in a first voltage range, while in normal mode, it operates in a second voltage range. This parameter adjustment allows the sense amplifier to maintain accurate signal transmission without requiring additional transistors, thus avoiding area increase.
Data Source
AI summary
A receiver circuit is capable of improving its operating characteristics. The receiver circuit includes a variable converter configured to output off-set control voltages in a first output range in a first operation mode and output the off-set control voltages in a second output range in a second operation mode according to a test mode activation signal, and a sense amplifier configured to sense input data based on a sensitivity, wherein the sensitivity is controlled by the off-set control voltages.