Monolithic Photo Detector with Dynamic Voltage Control
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Solution Overview
Problem
Current photo detector systems face challenges in efficiently detecting light and generating electrical signals in high-speed data communication systems, particularly in optical fiber-based systems, due to limitations in response time and power consumption, and the need for precise control over detection states.
Innovation Solution
The development of monolithic photo detectors with control circuitry that applies specific voltages to doped regions and gates, enabling the detection of light by separating electron-hole pairs and optimizing current flow, while allowing for programmable response time and power consumption adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional photo detector systems are used, then light detection function is provided, but response time is insufficient and power consumption is high
Solution Approach 1:
The patent implements dynamic control of the photo detector by applying different voltages to the gate electrode at different times. During the detection phase, a first voltage is applied to enable carrier separation and detection. During the reset phase, a second voltage is applied to clear residual carriers. This dynamic voltage switching optimizes both response time and power consumption by activating detection function only when needed and resetting the detector efficiently between measurements.
Solution Approach 2:
The photo detector operates in periodic cycles consisting of a detection phase followed by a reset phase. During the detection phase, the gate voltage enables carrier separation and signal generation. During the reset phase, the gate voltage is adjusted to clear residual carriers and prepare the detector for the next measurement. This periodic operation mode allows the system to achieve fast response times while managing power consumption through controlled activation and reset cycles.
2Measurement precision
If conventional photo detector systems are used, then light detection is performed, but sensitivity and efficiency are insufficient
Solution Approach 1:
The patent changes the electrical parameters of the photo detector by dynamically adjusting the gate voltage. During detection, a first voltage level is applied to maximize carrier separation and signal generation efficiency. During reset, a second voltage level is applied to clear residual carriers completely. This parameter switching enables the detector to operate at optimal sensitivity during measurement while maintaining high efficiency through effective reset, resolving the contradiction between detection sensitivity and overall detection efficiency.
3Ease of operation
If monolithic photo detectors with control circuitry are implemented, then detection state control is improved, but device complexity increases
Solution Approach 1:
The patent combines the photo detector structure with integrated control circuitry in a monolithic configuration. The control circuitry, including voltage switching elements and reset mechanisms, is integrated directly with the photo detector structure rather than being separate external components. This merging provides precise control over detection states through automated voltage switching while reducing overall system complexity by eliminating external control components and interconnections.
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 enhances the sensitivity and efficiency of light detection, improving the performance of photo detectors in high-speed data transmission systems by optimizing current gain and reducing power consumption, while allowing for precise control over detection states.
Implementation Method 1
a photo detector to detect the light and, in response thereto, to generate an electrical signal
Implementation Method 2
detecting light by separating electron-hole pairs and optimizing current flow
Data Source
AI summary
A monolithic photo detector device disposed on a bulk substrate, comprising a photo detector disposed integrated in the bulk substrate including: (1) a p-type doped impurity region extending along a first direction in the major surface of the substrate and receiving a first voltage, (2) first and second gates being spaced apart from each other and extending in the first direction over the major surface of the substrate, wherein the gates receives a second voltage, (3) an n-type doped impurity region, extending along the first direction in the major surface of the substrate and receiving a third voltage; and (4) a light absorbing region, disposed between the second doped impurity region and the first gate. The device also includes control circuitry, integrated in the substrate to generate the first, second and third voltages that control an operating state of the detector.