Sense Amplifier Overdrive Pulse Control for VDD Stability
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Solution Overview
Problem
The existing sense amplifier control circuits in semiconductor memory devices cannot effectively control the enable pulse width of the overdrive control signal in response to changes in the power supply voltage, leading to increased current consumption at high voltages and difficulty in maintaining normal operation at low voltages, which affects the stability and efficiency of the semiconductor memory device.
Innovation Solution
A sense amplifier control circuit that includes a voltage comparing unit to generate delay control signals based on divided voltages of the power supply voltage, allowing the pull-up control signal generating unit to adjust the enable pulse width of the overdrive control signal, thereby synchronizing the overdrive operation with the power supply voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the enable pulse width of the overdrive control signal is fixed, then the sense amplifier can operate simply, but current consumption increases at high power supply voltages and normal operation becomes difficult at low voltages
Solution Approach 1:
The enable pulse width of the overdrive control signal is made dynamic by adjusting it according to the power supply voltage level. The control circuit includes a voltage detecting unit that monitors VDD and a control unit that modifies the pulse width accordingly, allowing the system to adapt to varying voltage conditions automatically.
Solution Approach 2:
The patent changes the parameter of enable pulse width based on the power supply voltage level. At higher voltages, the pulse width is reduced to prevent excessive current consumption, while at lower voltages, the pulse width is extended to maintain proper operation, thus resolving the contradiction between adaptability and complexity.
2Speed
If the overdrive control signal is enabled for a longer duration, then the sense amplifier amplification speed improves, but current consumption increases significantly
Solution Approach 1:
The overdrive control signal is applied periodically rather than continuously. The control circuit enables the overdrive mode only during specific time windows determined by the power supply voltage level, allowing the sense amplifier to achieve fast amplification when needed while minimizing current consumption during extended periods.
Solution Approach 2:
The duration of the overdrive control signal is dynamically adjusted based on real-time voltage detection. The control unit modifies the enable pulse width according to the detected VDD level, optimizing the balance between amplification speed and energy consumption for each operating condition.
3Speed
If the delay time is reduced for faster signal response, then the amplification speed improves, but the control circuit cannot properly synchronize with power supply voltage changes
Solution Approach 1:
The control circuit incorporates a feedback mechanism where the voltage detecting unit continuously monitors the power supply voltage and provides information to the control unit. This feedback loop ensures that the delay time is adjusted appropriately to maintain synchronization with voltage changes, preventing mismatches that would compromise reliability.
Solution Approach 2:
The control circuit performs preliminary detection of the power supply voltage level before adjusting the overdrive control signal parameters. By detecting the voltage level in advance and pre-adjusting the delay time accordingly, the system ensures proper synchronization is established before the actual amplification operation begins.
Data Source
AI summary
The present invention discloses a sense amplifier control circuit which controls the sense amplifier. A sense amplifier control circuit comprises a voltage comparing unit outputting delay control signals having a value corresponding to each of divided voltages obtained by dividing a potential of a power supply voltage and a pull-up control signal generating unit outputting an overdrive control signal and a pull-up control signal by an active signal and changing an enable pulse width of the overdrive control signal in response to the delay control signals, whereby it is possible to reduce current consumption caused by unnecessary overdrive operation and prevent a potential drop of the power supply voltage and thus provide operational stability of the semiconductor memory device by providing the overdrive control signal of which the enable pulse width is controlled in response to the potential of the power supply voltage.