Differential TIA Shaping Filter for Low-Power Interference Suppression
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Solution Overview
Problem
Current trans-impedance amplifiers (TIAs) face a trade-off between power consumption and filtering performance, where reducing power consumption compromises filtering capability and out-of-band interference suppression.
Innovation Solution
A TIA design incorporating a single operational amplifier, three circuits with passive components, and a third circuit that cooperates with the first and second circuits to perform shaping filtering, enhancing filtering performance and out-of-band interference suppression while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a first-order active structure TIA is used, then power consumption is reduced, but filtering capability deteriorates
Solution Approach 1:
The patent combines first-order and second-order active structures into a hybrid architecture where a first operational amplifier implements first-order filtering while a second operational amplifier implements second-order shaping filtering. This merging allows the system to achieve both low power consumption (through the efficient first-order stage) and strong filtering capability (through the enhanced second-order stage), resolving the contradiction between power efficiency and filtering performance.
Solution Approach 2:
The filtering function is segmented into two distinct stages: a first-order filtering stage using one operational amplifier and a second-order shaping filtering stage using another operational amplifier. Each stage operates independently with optimized parameters, allowing the first stage to handle bulk filtering with lower power consumption while the second stage provides enhanced filtering precision, thus resolving the power-consumption versus filtering-capability contradiction.
2Reliability
If a second-order active structure TIA is used, then filtering capability is improved, but power consumption increases
Solution Approach 1:
The filtering function is segmented into two distinct stages: a first-order filtering stage using one operational amplifier and a second-order shaping filtering stage using another operational amplifier. Each stage operates independently with optimized parameters, allowing the first stage to handle bulk filtering with lower power consumption while the second stage provides enhanced filtering precision, thus resolving the power-consumption versus filtering-capability contradiction.
Solution Approach 2:
Different parts of the filtering system are assigned different qualities and functions: the first operational amplifier stage provides basic first-order filtering with lower power consumption for general signal processing, while the second operational amplifier stage provides enhanced second-order shaping filtering for specific frequency ranges requiring stronger suppression. This local differentiation optimizes the overall power-performance balance.
Data Source
AI summary
An integrated circuit, comprising an amplifier comprising a pair of inputs configured to receive a differential signal, a first resistor, a second resistor, wherein the first resistor and the second resistor are coupled in series with each other and coupled to a first input of the pair of inputs, a third resistor, a fourth resistor, wherein the third resistor and the fourth resistor are coupled in series with each other and coupled to a second input of the pair of inputs, and a first capacitor comprising a first end coupled to a first point between the first resistor and the second resistor, and a second end coupled to a second point between the third resistor and the fourth resistor, a second capacitor disposed between the first input and an output of the amplifier; and a third capacitor disposed between the second input and the output.