Resonant Clock Rib Topology for Low-Power Superconducting Biasing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
CMOS technology-based digital circuits face limitations in device size and power consumption, especially at high clock speeds, due to static power requirements and current leakage, leading to inefficiencies in high-performance systems like data center servers.
Innovation Solution
A resonant clock network (RCN) is designed to resonate with both AC clock signals of different phases, utilizing capacitive and inductive lines to provide bias currents to superconducting circuits, eliminating the need for bias resistors and ground return current, and using AC power to reduce power dissipation and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If CMOS technology is used for digital circuits, then device functionality is achieved, but power consumption increases due to static power requirements and current leakage
Solution Approach 1:
The patent replaces CMOS electronic circuits with superconducting circuits that use quantum mechanical effects (Josephson junctions) instead of classical electronic switching. This substitution eliminates resistive power loss and enables lossless signal transmission, directly addressing the power consumption issue while maintaining computational functionality through quantum logic operations
Solution Approach 2:
The patent changes the fundamental operating parameters of the circuit system by transitioning from DC voltage operation in CMOS to AC resonant operation in superconducting circuits. The resonant clock network operates at specific frequencies to excite Josephson junctions, changing the operational regime from static DC bias to dynamic AC resonance, which enables efficient power transfer and eliminates static power dissipation
2Reliability
If DC voltage is used to power CMOS circuits, then circuits operate reliably, but current leakage occurs even when circuits are inactive
Solution Approach 1:
The patent employs periodic AC clock signals at resonant frequencies to drive superconducting circuits instead of continuous DC voltage. The periodic nature of AC operation allows circuits to be active only during specific phases of the clock cycle, enabling dynamic power management where power is supplied periodically rather than continuously, thus eliminating leakage during inactive periods while maintaining reliable operation during active phases
Solution Approach 2:
The patent substitutes DC power delivery with AC resonant power delivery using superconducting transmission lines. This substitution leverages the zero-resistance property of superconductors to transmit AC power without resistive loss, and the resonant coupling mechanism to transfer energy efficiently only when needed, eliminating the current leakage inherent in DC-powered CMOS circuits
3Reliability
If elaborate balun networks are used for clock distribution, then signal integrity is maintained, but device area increases
Solution Approach 1:
The patent extracts and eliminates the need for balun networks by directly coupling the resonant clock network to superconducting logic circuits through capacitive or inductive interfaces. The superconducting transmission lines inherently provide the necessary impedance transformation and differential signaling functions that traditionally required separate balun components, thereby removing unnecessary circuitry and reducing device area while maintaining signal integrity through the resonant coupling mechanism
4Productivity
If CMOS technology is scaled down, then device density increases, but power consumption per device increases due to static power requirements
Solution Approach 1:
The patent replaces scaled-down CMOS devices with superconducting Josephson junction-based circuits that operate on quantum mechanical principles. This substitution fundamentally changes the power consumption characteristics by eliminating the static power dissipation associated with CMOS leakage currents, allowing high device density to be achieved without the proportional increase in power consumption that plagues scaled CMOS technology
Solution Approach 2:
The patent changes the operational parameters from DC voltage levels in CMOS to high-frequency AC resonant signals in superconducting circuits. This parameter change enables the use of pulse-based logic operations where power is consumed only during state transitions rather than continuously, allowing high-density integration while maintaining low average power consumption through efficient resonant energy transfer
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
The RCN reduces power dissipation, enhances performance by enabling faster Josephson junction switching, and simplifies fabrication, while eliminating the need for elaborate balun networks, resulting in lower impedance connections and reduced area requirements for clock distribution.
Implementation Method 1
a resonant clock network (RCN) configured to resonate in response to both a first clock signal having a first phase and a second clock signal having a second phase
Implementation Method 2
a first capacitive line configured to receive the first clock signal and provide, via a first capacitor, a first bias current to a first superconducting circuit
Implementation Method 3
at least one inductive line configured to connect the first capacitive line with the second capacitive line forming a direct connection between the first capacitive line and the second capacitive line
Implementation Method 4
a first superconducting circuit configured to propagate a first set of single flux quantum (SFQ) pulses
Implementation Method 5
a first superconducting circuit configured to propagate a first set of single flux quantum (SFQ) pulses
Data Source
AI summary
Topologies for interconnecting capacitive and inductive elements in a capacitively-coupled rib are described. An example relates to a resonant clock network (RCN) that resonates in response to both a first clock signal having a first phase and a second clock signal having a second phase. The RCN includes at least one rib coupled to at least one spine. The rib includes a first capacitive line configured to receive the first clock signal and provide, via a first capacitor, a first bias current to a first superconducting circuit. The rib further includes a second capacitive line configured to receive the second clock signal and provide, via a second capacitor, a second bias current to a second superconducting circuit. The rib further includes at least one inductive line configured to connect the first capacitive line with the second capacitive line forming a direct connection between the two capacitive lines.