Semiconductor Device Current-Mode Data Transmission
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Solution Overview
Problem
Existing semiconductor devices face challenges in efficiently transmitting small-amplitude signals due to variations in ground voltage, which affect data transmission reliability and increase power consumption, particularly in memory chips far from the power source terminal.
Innovation Solution
The semiconductor device incorporates a current drive circuit and a current reception circuit using nMOS transistors, with a constant current source and operational amplifier to detect signal levels based on current changes, reducing the impact of ground voltage variations and enabling stable data transmission with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If small-amplitude signals are transmitted to reduce power consumption, then power consumption is reduced, but ground voltage variations affect transmission reliability
Solution Approach 1:
The patent introduces a current reception circuit as an intermediary that converts received current signals back into voltage signals. This mediator handles the ground voltage variations internally, protecting the small-amplitude voltage signals from degradation while maintaining low power consumption throughout the transmission chain.
Solution Approach 2:
The patent changes the signal parameter from voltage to current during transmission. By transmitting small-amplitude current signals instead of voltage signals, the system achieves lower power consumption while the current signals are less susceptible to ground voltage variations. The current reception circuit then converts these current signals back to voltage signals for further processing.
2Reliability
If current drive circuit and current reception circuit are used to reduce ground voltage impact, then data transmission reliability is improved, but circuit area increases
Solution Approach 1:
The patent merges the constant current source functionality into the current reception circuit, eliminating the need for separate constant current source circuits in each memory chip. This integration reduces the overall circuit area while maintaining the reliability benefits of current-mode signaling through the shared constant current source.
3Measurement precision
If constant current source is provided in each memory chip to improve signal detection accuracy, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The constant current source circuit is designed with multi-functionality to serve both as a current drive source and as a reference current source for signal detection. This universal circuit performs multiple functions that would otherwise require separate dedicated circuits, thereby reducing overall device complexity while maintaining detection precision.
Solution Approach 2:
The patent combines the constant current source functionality with the current reception circuit, eliminating redundant circuits across multiple memory chips. This merging reduces device complexity and power consumption while the shared constant current source maintains signal detection accuracy through centralized control.
Data Source
AI summary
A semiconductor device includes a first circuit configured to generate a current corresponding to the input signal, a second circuit configured to generate a voltage corresponding to the current generated by the first circuit, a constant current source, a transistor that includes a drain terminal receiving a current from the constant current source and a gate terminal to which the voltage corresponding to the current generated by the first circuit is applied, and an amplification circuit configured to amplify a difference voltage between a drain voltage of the transistor and a reference voltage and output the amplified difference voltage as an output signal corresponding to the input signal.