Cross-Coupled Amplifier Circuit With Offset Compensation Switching
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Solution Overview
Problem
Integrated circuits face challenges in accurately processing small signals due to process skews among transistors, leading to performance variations and reliability issues, particularly in amplifier circuits where mismatches between transistors prevent accurate signal sensing.
Innovation Solution
An amplifier circuit design that includes a first and second inverter coupled in a cross-coupled form, with isolation and equalizing switches for offset compensation operations before amplification, enabling precise voltage difference amplification by compensating for transistor mismatches through pre-charge and charge sharing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If transistors are fabricated with smaller size to shrink integrated circuit dimensions, then integration density is improved, but process skew and performance variation increase
Solution Approach 1:
The patent applies preliminary action by performing offset compensation operations before the main amplification operation. The circuit executes pre-charge and offset compensation phases that prepare the inverters and switches in advance, eliminating the need for complex real-time correction mechanisms during signal amplification.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the operating states of switches (isolation switches and equalizing switches) and inverters through different voltage levels and connection configurations. The circuit changes parameters such as switch resistance, connection topology, and voltage levels to compensate for process variations.
2Use of energy by moving object
If transistor size is reduced to consume less power, then power consumption is improved, but signal sensing accuracy deteriorates due to increased offset
Solution Approach 1:
The patent performs preliminary offset compensation operations before signal amplification to eliminate the impact of transistor mismatches. By pre-charging the bit lines and compensating for offset voltages in advance, the circuit ensures accurate signal sensing even with miniaturized transistors that have higher relative offset.
Solution Approach 2:
The patent introduces isolation switches and equalizing switches as intermediary elements that mediate between the bit lines and the cross-coupled inverters. These intermediary switches enable precise control of signal paths and facilitate offset compensation without requiring larger transistor dimensions.
3Device complexity
If simple amplifier structure is used to reduce device complexity, then manufacturing ease is improved, but offset compensation capability deteriorates
Solution Approach 1:
The patent incorporates preliminary offset compensation operations into the amplifier's operational sequence. The isolation switches and equalizing switches are controlled to perform pre-charge and offset elimination phases before the main amplification, enabling reliable offset compensation with minimal additional structural complexity.
Solution Approach 2:
The patent makes the cross-coupled inverter structure multi-functional by enabling it to perform both offset compensation and signal amplification functions. The same inverter pair serves dual purposes: first for offset compensation during pre-charge phases, and then for the main amplification operation, reducing the need for separate compensation circuits.
Data Source
AI summary
An amplifier circuit includes: a first inverter and a second inverter coupled in a cross-coupled form during an amplification operation and suitable for amplifying a voltage difference between a first line and a second line; a first isolation switch suitable for electrically connecting the first line and an output terminal of the first inverter to each other; a second isolation switch suitable for electrically connecting the second line and an output terminal of the second inverter to each other; and an equalizing switch suitable for electrically connecting the output terminal of the first inverter and the output terminal of the second inverter to each other, wherein before the amplification operation, a first offset compensation operation for turning on the second isolation switch and the equalizing switch and a second offset compensation operation for turning on the first isolation switch and the equalizing switch are performed.