Solid-State Imaging Amplifier Parasitic Capacitance Reduction
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Solution Overview
Problem
The existing solid-state imaging apparatus experiences signal gain deterioration due to large parasitic capacitance in the input unit of the downstream source follower circuit.
Innovation Solution
The apparatus includes a first and second amplifier, a coupling capacitor with a first and second electrode, and metal members connecting the amplifiers' terminals to the capacitor electrodes, arranged in multiple directions to minimize parasitic capacitance, thereby reducing signal gain loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling capacitor is used to transmit signals between amplifiers, then signal transmission is enabled, but parasitic capacitance in the input unit deteriorates signal gain
Solution Approach 1:
The patent applies local quality by arranging the first metal member in specific directions (above, below, left, or right) relative to the second metal member in the cross section. This directional arrangement optimizes the local spatial relationship to minimize parasitic capacitance between the metal members, thereby reducing signal gain deterioration while maintaining necessary electrical connections.
Solution Approach 2:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional spatial arrangement by positioning metal members in vertical and horizontal directions in the cross section. This dimensional approach allows the first metal member to surround the second metal member from multiple directions, effectively reducing parasitic capacitance through optimized spatial configuration.
2Loss of energy
If metal members are arranged to minimize parasitic capacitance, then signal gain is improved, but device complexity increases
Solution Approach 1:
The patent employs asymmetry by arranging the first metal member in specific asymmetric directions (above, below, left, or right) relative to the second metal member rather than using a symmetric configuration. This asymmetric arrangement effectively reduces parasitic capacitance while avoiding the complexity of fully symmetric multi-directional arrangements.
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 configuration reduces parasitic capacitance, enhancing signal gain and enabling faster signal transmission by surrounding the second metal member with the first metal member, resulting in improved signal transmission speed and reduced signal gain deterioration.
Implementation Method 1
a coupling capacitor including a first electrode and a second electrode; a first metal member configured to connect an output terminal of the first amplifier and the first electrode; and a second metal member configured to connect an input terminal of the second amplifier and the second electrode
Data Source
AI summary
Provided is a solid-state imaging apparatus, including: a first amplifier and a second amplifier; a coupling capacitor including a first electrode and a second electrode; a first metal member configured to connect an output terminal of the first amplifier and the first electrode; and a second metal member configured to connect an input terminal of the second amplifier and the second electrode, wherein, in a cross section perpendicular to a line that runs from the second electrode toward the input terminal of the second amplifier, the first metal member is arranged in at least two directions out of directions relative to the second metal member that are above, below, to the left of, and to the right of the second metal member.