Dual-Tail Latch Power Gating for Faster Low-Voltage Sensing
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Solution Overview
Problem
Conventional dual-tail latches in semiconductor devices face challenges in reliably sensing and latching inputs at higher frequencies, leading to data eye distortion, reduced RMT margin, and difficulties in DFE training, especially under low voltage and high-speed operation conditions.
Innovation Solution
The implementation of an improved dual-tail latch with power gating circuits in the second stage, which includes additional p-type transistors to increase transconductance and voltage differential, thereby enhancing regeneration time and reducing current leakage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional dual-tail latch architecture is used, then device simplicity is maintained, but latching speed and signal fidelity deteriorate at high frequencies
Solution Approach 1:
The latch is divided into two distinct stages: a sensing stage with n-type input transistors and a second stage with p-type input transistors. This segmentation allows each stage to be optimized for specific functions, with the second stage providing enhanced regeneration capability through power gating without complicating the overall architecture
Solution Approach 2:
Power gating is dynamically applied to the second stage based on operational requirements. The power gating mechanism enables the latch to switch between active and low-power states, optimizing performance for high-speed operations while maintaining energy efficiency
2Use of energy by moving object
If low voltage operation is used, then power consumption is reduced, but latching reliability and margin deteriorate
Solution Approach 1:
The invention changes the transistor type parameter in the second stage from n-type to p-type, which has different electrical characteristics including higher mobility and better performance at low voltages. This parameter change enables reliable latching at low voltage conditions while maintaining low power consumption
Solution Approach 2:
Different transistor types are used in different stages of the latch. The first stage uses n-type transistors optimized for sensing, while the second stage uses p-type transistors optimized for regeneration at low voltages. This local differentiation of quality allows each stage to operate optimally under low voltage conditions
3Reliability
If traditional dual-tail latch is used, then manufacturing simplicity is maintained, but data eye distortion and RMT margin increase
Solution Approach 1:
The latch is divided into two distinct stages: a sensing stage with n-type input transistors and a second stage with p-type input transistors. This segmentation allows each stage to be optimized for specific functions, with the second stage providing enhanced regeneration capability through power gating without complicating the overall architecture
Solution Approach 2:
The latch uses asymmetric transistor configuration with different transistor types (n-type in first stage, p-type in second stage) rather than uniform transistors throughout. This asymmetry optimizes performance by matching transistor characteristics to stage-specific requirements, improving RMT margin while maintaining manufacturing feasibility
Data Source
AI summary
A semiconductor device includes a first sensing stage configured to sense a voltage differential of a data signal and a reference signal and output a first amplified voltage differential, wherein the first amplified voltage differential includes a first voltage at a first output node and a second voltage at a second output node. The semiconductor device further includes a second sensing stage configured to sense the first amplified voltage differential and output a second amplified voltage differential, where the second amplified voltage differential includes a third voltage at a third output node and a fourth voltage at a fourth output node. A first power gating circuit is coupled to the third output node and a second power gating circuit is coupled to the fourth output node.