Integrated Bias-Tee Circuit for Electrooptic Transducer Biasing
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Solution Overview
Problem
Existing integrated circuits face challenges in efficiently combining low-frequency bias voltages with high-frequency signals, particularly in electrooptic and optoelectric transducers, due to impedance mismatch and parasitic effects.
Innovation Solution
The development of an integrated circuit that integrates an electrooptic or optoelectric transducer and a capacitor on the same substrate, using a single fabrication process, enables the formation of a compact Bias-Tee structure that optimizes stray capacitances and parasitic resistances/inductances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete RFIC or packaged components are used to implement Bias-Tee, then the circuit functionality is achieved, but the device complexity and manufacturing complexity increase
Solution Approach 1:
The patent merges the Bias-Tee circuit with the electrooptic or optoelectric transducer into a single integrated circuit device. The capacitor and inductor elements are fabricated using the same semiconductor fabrication processes as the transducer, integrating multiple previously discrete components into one unified structure, thereby reducing both device complexity and manufacturing complexity
Solution Approach 2:
The integrated circuit serves multiple functions simultaneously: it acts as both the electrooptic or optoelectric transducer and the Bias-Tee circuit. The capacitor and inductor structures are designed to perform both their respective circuit functions while also being compatible with the transducer fabrication process, enabling a single device to replace multiple separate components
2Reliability
If capacitor and inductor are integrated at the same level, then stray capacitances are optimized, but fabrication process complexity increases
Solution Approach 1:
The patent utilizes standard semiconductor fabrication parameters and materials to create capacitor and inductor structures that can be formed at the same level as the transducer. By using conventional fabrication techniques with adjusted process parameters, the design achieves optimized parasitic characteristics without requiring complex or non-standard fabrication processes
Solution Approach 2:
The capacitor and inductor structures are designed with specific local geometries and material properties that optimize their electrical characteristics. The structures are positioned and dimensioned to minimize stray capacitances and parasitic effects while maintaining compatibility with the overall fabrication process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for efficient biasing of high-frequency signals and large bias voltages, reducing manufacturing complexity and cost while enhancing the compactness and adaptability of the device.
Implementation Method 1
a capacitor (12)
Data Source
AI summary
The invention relates to an integrated circuit (1), comprising: a substrate (10) which supports an electrooptic or optoelectric transducer (11) and a capacitor (12), wherein at least one electrically conductive element of the transducer (11) and at least one electrically conductive element of the capacitor (12) are arranged at the same level with respect to the substrate (10). The invention further relates to a method for fabricating the same.