Reconfigurable Isolated Amplifier Filter for Single-Ended ADC Coupling
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Solution Overview
Problem
Existing isolated amplifiers require external circuitry to interface with single-ended-input analog-to-digital converters (ADCs), increasing complexity, cost, and space, and presenting accuracy issues when using two ADCs.
Innovation Solution
A reconfigurable filter system with fully differential amplifiers and reconfigurable resistance-capacitance (RC) networks, allowing the isolated amplifier to operate in multiple modes, including single-ended and differential modes, without the need for external circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external circuitry is used to convert differential output to single-ended signal, then compatibility with single-ended-input ADC is achieved, but device complexity and board space increase
Solution Approach 1:
The filter is designed with reconfigurable RC networks that can be switched between different configurations to support both differential and single-ended output modes, allowing a single device to interface with both types of ADCs without requiring external conversion circuitry
Solution Approach 2:
The filter incorporates switchable RC networks that can dynamically reconfigure their topology based on the desired output mode, enabling the same hardware to adapt its behavior for different ADC interface requirements through electronic switching rather than fixed circuitry
2Measurement precision
If two ADCs are used to interface with differential outputs, then single-ended signal acquisition is achieved, but cost and device complexity increase
Solution Approach 1:
The filter provides both differential and single-ended output capabilities from a single device, allowing one ADC to handle both measurement tasks that would otherwise require two separate ADCs, thereby reducing system complexity while maintaining measurement functionality
3Ease of operation
If external conversion circuitry is used, then single-ended output is achieved, but board space and cost increase
Solution Approach 1:
The filter integrates both differential and single-ended output functionality within a single integrated circuit, merging the functions of what would traditionally require separate external conversion circuitry, thereby eliminating additional board space requirements and reducing overall system cost
Data Source
AI summary
Examples of circuitry and systems and methods provide a multi-way configurable amplifier to support various applications. The multi-way configurable amplifier may include a reconfigurable filter that comprises first and second inputs adapted to receive an input signal; a fully differential amplifier (FDA); and first and second reconfigurable resistance-capacitance (RC) networks. The FDA has an inverting input, a non-inverting input, an inverting output, and a non-inverting output. The inverting input is coupled to the first input, and the non-inverting input is coupled to the second input. The first reconfigurable RC network is coupled to the non-inverting output, and the second reconfigurable RC network is selectively couplable to the inverting output. The reconfigurable filter is configurable to enable operation in any of multiple modes including a single-ended mode of operation and a differential mode of operation.