Latching Sense Amplifier for High-Speed Low-Voltage Memory
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Solution Overview
Problem
Designing memories that can operate at high speeds while utilizing low voltages is challenging, as it becomes difficult to optimize both precharging and sensing processes as voltage scales down, requiring more flexibility in the sense amplifier.
Innovation Solution
The implementation of a latching sense amplifier circuit with separate precharge circuits and current sinks allows for independent optimization of precharging and sensing, enabling faster operation and improved flexibility by using fractional current values and separate precharge signals for bitlines and storage nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage continues to scale down, then power consumption is reduced, but flexibility in the sense amplifier is reduced
Solution Approach 1:
The sense amplifier is divided into separate precharge circuits and sensing circuits with independent control. The precharge circuits can be independently enabled or disabled based on whether precharging is needed, allowing the sensing circuit to operate optimally during sensing operations without being constrained by precharging requirements. This segmentation provides flexibility in low-voltage operation while maintaining both precharging and sensing functions.
2Adaptability or versatility
If separate precharge circuits and current sinks are implemented, then optimization flexibility is improved, but device complexity increases
Solution Approach 1:
The latching sense amplifier combines the precharge and sensing functions into a single integrated circuit structure. The cross-coupled inverter latch simultaneously performs precharging of storage nodes and sensing of bitline signals. By merging these functions into one unified circuit rather than using completely separate circuits, the design achieves optimization flexibility while controlling complexity through shared circuit elements and coordinated control signals.
Data Source
AI summary
A memory comprises a sense amplifier for sensing a logic state of a selected bitline. The sense amplifier includes a first precharge circuit, a current-to-voltage converter, a latch circuit, and a second precharge circuit. The first precharge circuit is for precharging a selected bitline to a first predetermined voltage in response to a first precharge signal. The current-to-voltage converter has a current input coupled to the selected bitline, and a voltage output. A latch circuit has a storage node coupled to the voltage output of the current-to-voltage converter. The second precharge circuit is for precharging the storage node of the latch circuit to a second predetermined voltage in response to a second precharge signal.