Cross-Coupled Sense Amplifier for Low-Noise Fast Sensing
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Solution Overview
Problem
Conventional sense amplifiers in memory devices face issues with high power consumption, noise disturbance between adjacent digital amplifiers, and reduced sensing speed due to large voltage swings and spatial proximity, leading to data signal degradation.
Innovation Solution
The design incorporates cross-coupled transistor pairs, current sources, and digital input transistors to reduce power consumption and noise, while enhancing sensing speed by optimizing the coupling of transistor ends and using bias voltages to control current sources and active switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sense amplifier technology uses a plurality of devices that require a complete flip of the digital signals, then the sensing function is achieved, but a large amount of current is generated leading to high power consumption
Solution Approach 1:
The sense amplifier is divided into two separate amplifiers (first sense amplifier and second sense amplifier) that operate independently on differential signals. Each amplifier processes one signal line, segmenting the original single amplifier into multiple functional units that consume less power individually while maintaining collective sensing accuracy.
Solution Approach 2:
The invention changes the operating parameters by using separate amplifiers with controlled current sources instead of a single amplifier with high current. The current sources are regulated to provide only the necessary current for each signal line, reducing overall power consumption while maintaining sensing precision through the differential signal architecture.
2Area of stationary object
If tight spatial proximity is used between adjacent amplifiers, then area is reduced, but large amount of voltage swing required on digital signals generates noise and causes data signal sensing degradation
Solution Approach 1:
The sense amplifier is segmented into two independent amplifiers positioned at different locations in the circuit. This spatial segmentation separates the noise-generating voltage swings of adjacent signal lines, reducing mutual interference and noise coupling while maintaining a compact overall area through the distributed architecture.
Solution Approach 2:
The differential signal architecture acts as an intermediary mechanism that isolates noise between adjacent signal lines. By processing signals differentially and using matched transistor pairs, the circuit rejects common-mode noise while preserving the differential signal integrity, effectively filtering out the harmful noise generated by voltage swings.
3Measurement precision
If conventional sense amplifier generates large voltage swing, then sensing capability is achieved, but noise is increased and sensing speed is reduced
Solution Approach 1:
The sense amplifier uses controlled switching action to activate current sources only when needed for sensing operations. The current sources are turned on periodically during sensing events rather than continuously, enabling rapid voltage transitions when required while maintaining low power consumption and noise levels during idle periods, thus improving sensing speed.
Solution Approach 2:
The invention optimizes the voltage swing parameters by using controlled current sources that provide precisely the right amount of current to achieve the necessary voltage transitions. This controlled parameter approach achieves sufficient voltage swing for sensing capability while minimizing excess voltage excursions that would generate noise and slow down the sensing process.
Data Source
AI summary
A sense amplifier is provided. The sense amplifier comprises a first and second cross-coupled transistor pairs, a first and second current sources, a first digital input transistor, and a second digital input transistor. The first and second ends of the first cross-coupled transistor pair are coupled to an operating voltage, the first and second back gate ends of the first cross-coupled transistor pair are coupled to a first and second output ends respectively. The first and second back gate ends of the first cross-coupled transistor pair are coupled to a first and second output ends respectively, and the first and second ends of the first cross-coupled transistor pair are coupled to a first digital input end and second digital input end respectively.