Dual-Mode Operational Amplifier Switching for Chip Area Savings
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Solution Overview
Problem
Conventional electrical systems require multiple amplifier circuits to achieve both fully-differential and single-ended amplifying modes, which is not feasible in limited chip space and increases device cost.
Innovation Solution
A dual mode operational amplifier that functions as both fully-differential and single-ended amplifier, utilizing additional transistors as switches to selectively operate in desired modes, allowing for both modes of operation within a single amplifier circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two or more separate amplifier circuits are used to provide fully-differential and single-ended modes, then operational versatility is improved, but chip area and device cost increase
Solution Approach 1:
The operational amplifier is designed to perform multiple functions by operating in different modes. A single amplifier circuit can function as both a fully-differential amplifier and a single-ended amplifier by selectively enabling or disabling specific circuits (first and second circuits) through control signals, thereby achieving operational versatility without requiring multiple separate amplifier circuits.
Solution Approach 2:
The patent combines the functionality of two separate amplifier circuits (fully-differential and single-ended) into a single integrated operational amplifier. By merging the first and second circuits within one amplifier structure and using switches to selectively activate them, the design reduces chip area while maintaining both operational modes.
2Adaptability or versatility
If two or more separate amplifier circuits are used to provide fully-differential and single-ended modes, then operational versatility is improved, but device cost increases
Solution Approach 1:
The operational amplifier is designed to perform multiple functions by operating in different modes. A single amplifier circuit can function as both a fully-differential amplifier and a single-ended amplifier by selectively enabling or disabling specific circuits (first and second circuits) through control signals, thereby achieving operational versatility without requiring multiple separate amplifier circuits.
Solution Approach 2:
The patent combines the functionality of two separate amplifier circuits (fully-differential and single-ended) into a single integrated operational amplifier. By merging the first and second circuits within one amplifier structure and using switches to selectively activate them, the design reduces chip area while maintaining both operational modes.
3Adaptability or versatility
If additional transistors are added to enable dual mode operation in a single amplifier, then operational versatility is improved, but device complexity increases
Solution Approach 1:
The amplifier incorporates switches (made of additional transistors) that dynamically reconfigure the circuit topology based on the desired operating mode. These switches are controlled by mode selection signals that enable or disable specific circuits, allowing the amplifier to adapt its structure and function according to operational requirements without requiring physically separate circuits for each mode.
Data Source
AI summary
Various embodiments of the present technology comprise a method and apparatus for a dual mode operational amplifier. According to various embodiments, the operational amplifier functions as both a fully-differential amplifier and a single-ended amplifier. The operational amplifier may comprise additional transistors that function as switches, which can be selectively operated according to a desired mode.