Differential Amplifier Input Gating for Noise-Stable Signal Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Differential amplifier circuits face operation errors due to potential variations at the input nodes caused by noise, especially when signal amplitude is reduced for high-speed operations, leading to incorrect differential amplification.
Innovation Solution
Inserting transfer gates into differential input signal lines and controlling their conductive/interrupted states to equalize floating capacitances of input nodes, thereby adjusting signal input timing and suppressing potential variations at the start of differential amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If signal amplitude is reduced to achieve higher speed, then operation speed is improved, but operation errors occur due to small variation in input potential resulting from noise
Solution Approach 1:
The patent applies preliminary action by equalizing the floating capacitances of the differential input nodes before the differential amplification operation begins. Transfer gates are used to connect the input nodes to reference potential, ensuring that any potential variations due to noise are minimized before the actual signal comparison takes place. This preliminary equalization of capacitance values prevents operation errors even when signal amplitude is reduced for high-speed operation.
2Productivity
If differential amplifier circuit is used for high-speed operation with reduced signal amplitude, then productivity is improved, but measurement precision deteriorates due to noise-induced potential variation
Solution Approach 1:
The patent implements equipotentiality by using transfer gates to connect the differential input nodes to a common reference potential, thereby equalizing their floating capacitances. This ensures that both input nodes start from the same potential baseline before differential amplification, eliminating potential differences caused by unequal capacitance values. As a result, the circuit can operate at high speeds with reduced signal amplitude while maintaining accurate signal comparison.
3Reliability
If transfer gates are inserted to equalize floating capacitances, then operation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses transfer gates as intermediary elements to equalize the floating capacitances of the differential input nodes. These transfer gates act as mediators that temporarily connect the input nodes to a reference potential during the equalization phase, ensuring accurate capacitance balancing without requiring fundamental changes to the differential amplifier structure. This approach improves amplification accuracy while adding only minimal circuit complexity.
Data Source
AI summary
A differential amplifier circuit is provided with transfer gates for interrupting input signals to control a timing of supplying the input signals and a timing of starting the differential amplifier circuit.