Superconducting Output Amplifier Interstage Filtering for Waveform Purity
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Solution Overview
Problem
CMOS-based digital circuits face high power consumption due to leakage current and the need to maintain transistor states, even when inactive, leading to inefficient energy use in devices like servers.
Innovation Solution
A superconducting output amplifier with interstage filters comprising damped Josephson junctions is used to reduce distortion in output voltage waveforms, employing a stack of superconducting output amplifier stages that convert single flux quantum pulses into output voltage while minimizing power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CMOS circuits are used to maintain transistor states, then the circuit functionality is preserved, but power consumption increases due to leakage current
Solution Approach 1:
The patent employs superconducting circuits that utilize phase transitions in Josephson junctions to maintain circuit states without continuous power consumption. The superconducting state allows the circuit to preserve information and functionality without the leakage current inherent in CMOS transistors, directly addressing the power consumption issue while maintaining reliability
2Power
If multiple superconducting output amplifier stages are stacked to increase output voltage, then the amplification capability is improved, but distortion in the output voltage waveform increases
Solution Approach 1:
The patent introduces interstage filters as intermediary components between the stacked superconducting output amplifier stages. These filters, comprising damped Josephson junctions, serve as mediators that condition the signal between stages, removing distortion components while preserving the amplification effect, thus resolving the contradiction between increased output voltage and waveform distortion
3Manufacturing precision
If interstage filters with damped Josephson junctions are added between amplifier stages, then output waveform distortion is reduced, but device complexity increases
Solution Approach 1:
The patent employs damped Josephson junctions in the interstage filters that are consistent with the superconducting technology already used in the amplifier stages. This homogeneity in technology approach allows the filtering components to be integrated seamlessly with the existing superconducting circuit architecture, reducing the relative increase in complexity while achieving waveform distortion reduction
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 solution effectively reduces power dissipation and distortion in output waveforms, enhancing the efficiency of superconducting logic-based systems by leveraging the low static power dissipation of RQL circuits and the filtering capabilities of damped Josephson junctions.
Implementation Method 1
an interstage filter comprising a damped Josephson junction (JJ) coupled between the first superconducting output amplifier stage and the second superconducting output amplifier stage
Implementation Method 2
converting the first plurality of SFQ pulses into an output voltage waveform
Data Source
AI summary
Superconducting output amplifiers with interstage filters and related methods are described. An example superconducting output amplifier includes a first superconducting output amplifier stage and a second superconducting output amplifier stage. The superconducting output amplifier may further include a first terminal for receiving a first single flux quantum (SFQ) pulse train and coupling the SFQ pulse train to each of the first superconducting output amplifier stage and the second superconducting output amplifier stage. The superconducting output amplifier may further include an interstage filter comprising a damped Josephson junction (JJ) coupled between the first superconducting output amplifier stage and the second superconducting output amplifier stage, where the interstage filter is arranged to reduce distortion in an output voltage waveform generated by the superconducting output amplifier in response to at least the first SFQ pulse train.