Vertically Integrated RC Structure for Tunable IC Footprint Reduction
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Solution Overview
Problem
Conventional IC designs face challenges in combining analog and digital performance efficiently due to the consumption of precious IC real estate by planar/horizontal capacitors and resistors, which are difficult to scale down effectively.
Innovation Solution
A vertically integrated circuit structure using ion implantation in MOS transistor processing technology, with a semiconductor substrate and conductive regions separated by depletion regions and insulating layers, allowing for tunable capacitance and resistance through external voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional planar capacitors and resistors are used in IC design, then the fabrication process is well-established, but the IC real estate consumption increases significantly
Solution Approach 1:
The patent transitions from planar (2D) capacitor and resistor designs to vertically integrated (3D) structures. The capacitor uses stacked conductive plates separated by dielectric layers in the vertical dimension, while the resistor uses a vertical conductive path through the substrate. This dimensional transition dramatically reduces the horizontal footprint on the IC chip while maintaining functional performance.
Solution Approach 2:
The vertically integrated structure nests multiple functional elements within a compact volume. The capacitor embeds multiple conductive plates and dielectric layers stacked vertically within a small footprint area. The resistor structure integrates the conductive path vertically through the substrate, nesting the functional elements in the vertical dimension rather than spreading them horizontally.
2Area of stationary object
If vertically integrated RC structures are implemented, then IC real estate is reduced, but the fabrication complexity increases
Solution Approach 1:
The vertically integrated structure serves multiple functions within a single fabrication sequence. The same stacked conductive plates and dielectric layers that form the capacitor also create the vertical conductive path for the resistor. This multi-functionality allows both RC elements to be fabricated simultaneously using standard CMOS processes, avoiding the need for separate complex fabrication steps for each component type.
Solution Approach 2:
The patent merges the fabrication of capacitors and resistors into a single integrated structure and process sequence. Both elements share common fabrication steps including dielectric deposition, conductive plate formation, and patterning. This consolidation reduces the overall fabrication complexity compared to producing separate planar capacitors and resistors with their own dedicated process steps.
3Device complexity
If fixed capacitance and resistance values are used, then the design is simpler, but the adaptability to different circuit requirements is reduced
Solution Approach 1:
The patent introduces dynamic tunability to the capacitor and resistor values through the application of external bias voltages. The depletion region width in the vertically integrated structure can be modulated by applying different voltages to the control electrode, which dynamically adjusts the effective capacitance and resistance values. This allows the same physical structure to adapt to different circuit requirements without requiring multiple fixed-value components.
Solution Approach 2:
The patent enables continuous adjustment of capacitance and resistance parameters through voltage control. By changing the bias voltage applied to the control electrode, the depletion region characteristics change, which directly modulates the electrical parameters of both the capacitor and resistor. This parameter control mechanism provides versatility while maintaining a single integrated structure design.
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 reduces IC real estate demand, maintains compatibility with standard MOS transistor fabrication, and enables flexible tuning of capacitance and resistance, enhancing IC design efficiency.
Implementation Method 1
a first depletion region positioned between the first conductive region and the third conductive region; a second depletion region positioned between the second conductive region and the third conductive region
Implementation Method 2
The present invention leverages ion implantation in the MOS transistor processing technology to achieve vertically integrated RC structure
Implementation Method 3
a vertically integrated circuit structure using ion implantation in MOS transistor processing technology, featuring tunable capacitors and resistors with a unique geometry that reduces space requirements
Data Source
AI summary
A circuit structure with a capacitor or a resistor includes a semiconductor substrate, a first conductive region positioned in the semiconductor substrate, a plurality of second conductive regions and third conductive regions positioned in the first conductive region, a first depletion region positioned between the first conductive region and the third conductive region, a second depletion region positioned between the second conductive region and the third conductive region, and a plurality of separating regions positioned in the first conductive region, configured to separate the second and the third conductive regions. In operation, a first voltage is applied to the separating region to control the capacitance or the resistance of the circuit structure. A second voltage is applied to the first conductive region and a third voltage is applied to the second conductive region to measure the capacitance and the resistance of the circuit structure.