Memory Majority Detector Using Dual-Voltage Sense Amplification
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Solution Overview
Problem
Conventional dynamic memory majority detectors require a large number of transistors, leading to increased power consumption, layout area, and reduced performance efficiency, making it challenging to reduce power consumption and transistor count while maintaining effective data signal processing.
Innovation Solution
A memory apparatus with a majority detector that includes a pull-up circuit, switches, first and second transistors, and a sense amplifying circuit, where the first and second nodes are pulled up to different voltages during a sensing period, allowing the sense amplifying circuit to generate a sensing result based on voltage differences, thereby reducing transistor count and power consumption without compromising sensing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional majority detectors are used, then majority detection function is achieved, but transistor count increases and power consumption increases
Solution Approach 1:
The majority detector is segmented into multiple independent detection circuits, each handling a portion of the data bits. This allows the overall detection function to be achieved while using fewer transistors per segment, reducing the total transistor count compared to a monolithic conventional detector.
Solution Approach 2:
The patent changes the operating voltage parameters by introducing a first voltage and a second voltage (where the second voltage is higher). This voltage parameter change enables the sense amplifying circuit to achieve sufficient sensing capability with reduced transistor count, as the higher voltage provides stronger drive current for the sensing operation.
2Reliability
If conventional majority detectors are used, then majority detection function is achieved, but layout area increases
Solution Approach 1:
By dividing the majority detector into multiple segments that can be independently implemented, the layout area is reduced through better spatial utilization. Each segment uses fewer transistors and occupies less area, and the modular structure allows for more efficient packing in the chip layout.
Solution Approach 2:
The patent merges the pull-up circuit functionality directly into the sense amplifying circuit structure, eliminating the need for separate pull-up circuit blocks. This integration reduces the overall layout area by combining functions that were previously implemented as separate components.
3Reliability
If conventional majority detectors are used, then majority detection function is achieved, but power consumption increases
Solution Approach 1:
The majority detector operates in periodic cycles with distinct phases: a precharge phase where nodes are charged to the first voltage, and a sensing phase where the second (higher) voltage is applied for a limited duration to perform detection. This periodic operation allows the circuit to consume high power only briefly during sensing while consuming minimal power during precharge and idle periods, reducing average power consumption.
Solution Approach 2:
By changing the voltage parameter from a single operating voltage to two distinct voltages (first voltage for precharge, second higher voltage for sensing), the circuit achieves efficient power management. The higher second voltage provides sufficient drive current for fast sensing with minimal time, while the lower first voltage reduces static power consumption during non-sensing periods.
4Use of energy by stationary object
If transistor count is reduced, then power consumption decreases, but sensing speed may be reduced
Solution Approach 1:
The patent compensates for reduced transistor count by changing the voltage parameter - applying a second voltage that is higher than the first voltage during the sensing period. This higher voltage provides stronger electric fields and faster charge/discharge rates, maintaining sensing speed despite using fewer transistors.
Solution Approach 2:
The circuit uses periodic precharging of nodes to the first voltage followed by brief sensing periods with the second higher voltage. This periodic action ensures that nodes start from a known state and the sensing operation completes quickly during the high-voltage window, maintaining fast sensing performance while allowing the circuit to return to low-power state immediately after sensing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution effectively reduces power consumption and increases sensing speed, improving the performance efficiency of the memory apparatus by minimizing the number of transistors required for majority detection without increasing layout area.
Implementation Method 1
The sense amplifying circuit is coupled to the first node and the second node, and generates a sensing result according to a voltage difference between the first node and the second node during the sensing period
Data Source
AI summary
A memory apparatus and a majority detector thereof are provided. The majority detector includes a pull-up circuit, a first switch, a second switch, a plurality of first transistors, a plurality of second transistors and a sense amplifying circuit. The pull-up circuit provides a first voltage to a first node and a second node according to a control signal before a sensing period. The first switch and the second switch provide a second voltage to the first node and the second node respectively according to the control signal during the sensing period. Control ends of the first transistors each receives one of a plurality of values of a data signal. Control ends of the second transistors each receives an inverse value of the one of the values of the data signal. The sense amplifying circuit generates a sensing result according to a voltage difference between the first node and the second node during the sensing period, and the sensing result indicates a majority value among the values.