3D Resonant Clock Networks for Stacked Superconducting ICs
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Solution Overview
Problem
CMOS technology-based digital circuits face limitations in device size and power consumption, particularly due to static power maintenance and current leakage, even when inactive, leading to inefficiencies in high-performance systems like data center servers.
Innovation Solution
The use of superconducting integrated circuits with resonant clock networks and reciprocal quantum logic gates, employing metamaterial transmission lines and through-silicon vias for efficient clock and power distribution across vertically stacked chips, which reduces power dissipation and increases computing density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If CMOS technology is used for digital circuits, then device integration is achieved, but power consumption increases due to static power maintenance and current leakage
Solution Approach 1:
The patent transitions from CMOS technology operating at room temperature to superconducting technology operating at cryogenic temperatures. This parameter change (temperature) fundamentally alters the electrical properties of the materials, enabling zero-resistance current flow and eliminating static power consumption while maintaining high device integration through superconducting logic gates and resonant clock networks
2Productivity
If CMOS circuits operate at high clock speeds, then processing performance improves, but power consumption increases due to dynamic power dissipation
Solution Approach 1:
The patent replaces the traditional CMOS switching mechanism with superconducting logic gates that utilize quantum mechanical effects (Josephson junctions) and resonant electromagnetic oscillations. This substitution enables high-speed operation through resonant clock networks while eliminating resistive power dissipation, as superconducting materials carry current without resistance
3Quantity of substance
If vertically stacked superconducting integrated circuits are implemented, then computing density increases, but clock signal distribution complexity increases
Solution Approach 1:
The patent extends the clock distribution network from two-dimensional planar routing to three-dimensional vertical stacking. Multiple superconducting integrated circuits are stacked vertically and interconnected through through-silicon vias, creating a volumetric computing architecture. The resonant clock network propagates synchronized clock signals across all stacked layers simultaneously, managing the complexity of inter-layer signal distribution
4Ease of manufacture
If traditional clock distribution networks are used in superconducting circuits, then implementation is straightforward, but power efficiency decreases
Solution Approach 1:
The patent implements resonant clock networks that utilize periodic electromagnetic oscillations at specific resonant frequencies. The clock distribution network is designed as a resonant system where the clock signal naturally oscillates and propagates through the superconducting interconnects with minimal energy loss. This periodic resonant action replaces traditional continuous DC biasing schemes, achieving superior power efficiency while maintaining synchronized clock distribution across the entire circuit
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 approach enables efficient clock and power distribution with up to 90% power efficiency, reducing signal propagation delay and heat generation, thus enhancing computing efficiency and reducing the need for extensive cooling systems.
Implementation Method 1
each of the first clock signal and the second clock signal has a same resonant frequency
Implementation Method 2
the at least one stub further inductively coupled to at least one first superconducting circuit
Implementation Method 3
Stacked superconducting integrated circuits with three dimensional resonant clock networks
Data Source
AI summary
Stacked superconducting integrated circuits with three dimensional resonant clock networks are described. An apparatus, including a first superconducting integrated circuit having a first clock distribution network for distributing a first clock signal in the first superconducting integrated circuit, is provided. The apparatus further includes a second superconducting integrated circuit, stacked on top of the first superconducting integrated circuit, having a second clock distribution network for distributing a second clock signal in the second superconducting integrated circuit, where each of the first clock distribution network and the second clock distribution network comprises a clock structure having a plurality of unit cells, where each of the plurality of unit cells includes at least one spine and at least one stub, the at least one stub inductively coupled to a first superconducting circuit, and where each of the first clock signal and the second clock signal has a same resonant frequency.