Multi-mode Amplifier Configuring Op-amp and Current Conveyor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuit designers face the challenge of choosing between operational amplifiers (op-amps) and type II current conveyors (CCII) for specific applications, as each has unique benefits and drawbacks, necessitating the inclusion of both components in their library, which increases infrastructure costs and design complexity.
Innovation Solution
A single analog component capable of operating in multiple modes, functioning as both an op-amp and a CCII, with two high-impedance voltage inputs and two high-impedance current outputs that can be configured to amplify differences between inputs, allowing it to operate in various modes, including op-amp and CCII modes, and optionally functioning as a four-terminal floating nullor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If designers include both op-amps and CCIIs in their component library, then application-specific performance requirements are met, but library infrastructure costs and design complexity increase
Solution Approach 1:
The patent describes an operational amplifier that can operate in multiple modes: traditional op-amp mode with high-impedance voltage inputs and low-impedance voltage output, and CCII mode with low-impedance voltage input and high-impedance current output. This multi-functionality allows a single component to replace both op-amps and CCIIs in a designer's library, reducing infrastructure costs while maintaining application-specific performance requirements
2Device complexity
If a single component performs multiple functions, then library infrastructure costs and design complexity are reduced, but component functionality and operational modes must be carefully managed
Solution Approach 1:
The operational amplifier incorporates dynamic switching mechanisms that allow it to change its operational characteristics based on configuration. The component can dynamically switch between op-amp mode and CCII mode through external control signals or configuration circuits, enabling adaptability to different application requirements while maintaining a reduced component library
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(d)
Figure 3
AI summary
An amplifier capable of operating in multiple modes may include (a) first and second voltage inputs and (b) first and second current outputs that have substantially the same amplitude and polarity. Preferably, the inputs and outputs of the amplifier will have high impedances. The amplifier may operate in a first mode - and function as an operational amplifier - when the first and second current outputs are coupled together. The amplifier may operate in a second mode - and function as a type-2 current conveyor - when the second current output is coupled to the second voltage input. The amplifier may additionally include a third current output that has an amplitude that is substantially the same as the amplitudes of the first and second outputs and a polarity that is substantially opposite to the polarities of the first and second outputs. In this configuration the amplifier may function as a four-terminal floating nullor.