Reference-Triggered Sense Amplifier Latching for Lower Read Power
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Solution Overview
Problem
Conventional sense amplifiers in integrated circuit memory devices consume significant power due to the use of DC current for both precharging and sensing operations, especially in large memory arrays, as they rely on timers for latching timing which can lead to unnecessary power consumption.
Innovation Solution
A sense amplifier control system that uses a reference signal generated by a reference cell to control the latching timing of sense amplifiers, eliminating the need for a timer and reducing DC current consumption during the read sensing phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC current is used for precharging and sensing operations in sense amplifiers, then reliable data sensing is achieved, but power consumption increases significantly
Solution Approach 1:
The patent implements periodic action by using clock signals to control the sense amplifier operations. The sense amplifier is enabled only during specific clock cycles (precharge phase and sense phase) rather than continuously, allowing DC current to be applied periodically rather than constantly. This reduces overall power consumption while maintaining reliable data sensing during the active phases.
Solution Approach 2:
The patent applies dynamics by making the sense amplifier operational state dynamic rather than static. The sense amplifier transitions between disabled, precharging, sensing, and reset states based on clock signals and control logic. This dynamic operation allows the system to apply power only when needed for specific operations, reducing overall DC current consumption while maintaining sensing reliability during active periods.
2Loss of time
If timers are used for latching timing control in sense amplifiers, then precise timing control is achieved, but unnecessary power consumption occurs during extended operation periods
Solution Approach 1:
The patent implements feedback by using the output of the reference cell as a control signal for the sense amplifier latching operation. The reference cell output, which reflects the actual voltage decay characteristics of the bit line, provides feedback that dynamically controls when the sense amplifier should latch the data. This ensures precise timing adapted to actual circuit conditions rather than fixed timer delays, reducing unnecessary extended operation and associated power consumption.
Solution Approach 2:
The patent applies self-service by allowing the reference cell to automatically generate the control signal for sense amplifier latching without external timer intervention. The reference cell's natural voltage decay characteristics directly control the latching timing through its output signal, eliminating the need for separate timer circuits and their associated power consumption while maintaining precise timing based on actual circuit behavior.
3Reliability
If sense amplifiers operate continuously to ensure data capture, then data capture reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the sense amplifier to operate only during specific phases (precharge and sense phases) dictated by clock signals, rather than continuously. The sense amplifier is disabled during intermediate phases, reducing power consumption while ensuring it is active and ready for data capture during the critical phases, thus maintaining reliability without continuous operation.
Solution Approach 2:
The patent applies preliminary action by precharging the bit lines and enabling the sense amplifier in advance of the actual data sensing event. The precharge phase prepares the circuit conditions beforehand, and the sense amplifier is enabled提前 so that when data is present on the bit line, the amplifier is already ready to capture it reliably. This eliminates the need for continuous operation by ensuring readiness before the critical sensing moment.
Data Source
AI summary
A sense amplifier control system includes a precharge control switch configured to receive a precharge signal. A reference cell is configured to receive a reference word line signal. In a precharge phase, the control switch is controlled in response to the precharge signal to precharge the reference input node to a predetermined precharge level. In a sensing phase subsequent to the pre-charge phase, the trigger circuit is configured to output a triggering signal at the output terminal in response to the reference input node reaching a triggering level.