Reference Current Optimizing Apparatus for DROS Stability
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Solution Overview
Problem
Existing Double Relaxation Oscillation SQUID (DROS) systems face instability due to fixed reference currents, thermal conduction issues, and increased complexity in multi-channel systems, leading to suboptimal operation and fabrication challenges.
Innovation Solution
A reference-current optimizing apparatus is introduced, comprising a buffer, low-pass filter, voltage controller, and resistors to control the reference current of the DROS, preventing inverse current flow and eliminating noise, thereby stabilizing the magnetic flux-voltage characteristic and reducing the number of connection lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed reference current is used in the reference junction, then the structure is simple and operation is convenient, but the magnetic flux-voltage characteristic cannot be optimized and operation stability is poor
Solution Approach 1:
The patent transforms the fixed reference current into a dynamically adjustable current by introducing a voltage controller that can modify the reference current based on feedback signals. This allows the system to adapt to different operating conditions and maintain optimal performance, resolving the contradiction between simple fixed-structure operation and stable optimized performance.
Solution Approach 2:
The patent implements a feedback mechanism where the output of the DROS is fed back to the voltage controller, which adjusts the reference current accordingly. This closed-loop control ensures that the magnetic flux-voltage characteristic remains optimized under varying conditions, improving operation stability while maintaining ease of use through automatic adjustment.
2Adaptability or versatility
If another electric wire is added to control reference current, then reference current can be controlled, but the number of connection lines increases causing thermal conduction and fabrication complexity
Solution Approach 1:
The patent makes the existing connection lines serve multiple functions by using them to transmit both signal and control voltage. The voltage controller generates control voltages that are transmitted through the same connection infrastructure, eliminating the need for separate control wires and reducing thermal conduction paths while maintaining reference current control capability.
Solution Approach 2:
The patent replaces physical wire-based current control with an electrical field-based voltage control mechanism. Instead of using additional wires to directly control reference current, the system uses voltage signals to control the current through the existing junction structure, reducing physical connection complexity.
3Device complexity
If preamplifier input current flows into reference junction, then the circuit is simple, but DROS operation becomes unstable or characteristics change beyond optimal conditions
Solution Approach 1:
The patent extracts the harmful input current from the preamplifier by introducing a buffer amplifier between the preamplifier and the reference junction. This buffer isolates the reference junction from the preamplifier's input current, preventing it from flowing into the junction and disrupting optimal operating conditions, while maintaining circuit simplicity through the use of standard buffer components.
Solution Approach 2:
The patent introduces a buffer amplifier as an intermediary component between the preamplifier and the reference junction. This intermediary prevents direct current flow from the preamplifier into the reference junction, isolating the sensitive junction from harmful current while maintaining the overall circuit simplicity through the use of a standard buffer stage.
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 apparatus ensures stable operation of the DROS by optimizing the reference current, maintaining optimal conditions, reducing thermal conduction, and simplifying the fabrication process, while preventing input current saturation and enhancing magnetic flux-voltage conversion characteristics.
Implementation Method 1
a buffer for preventing a current from flowing inversely
Implementation Method 2
a low-pass filter for eliminating noise
Implementation Method 3
a voltage controller for applying a voltage and a resistor connected between the voltage controller and the reference junction for controlling an amount of the current
Implementation Method 4
a SQUID refers to a high-sensitivity magnetometer that can detect up to a minute magnetic flux density of a 10−15 T (tesla) scale by employing the Josephson effect
Data Source
AI summary
A reference-current optimizing apparatus of a Reference Junction Double Relaxation Oscillation SQUID (RJ-DROS) with a signal SQUID and a reference junction for detecting a magnetic flux signal is provided. The reference-current optimizing apparatus includes a voltage controller for converting a digital signal into an output voltage; a buffer for receiving the output voltage and preventing a current generated in the RJ-DROS from flowing inversely into the reference-current optimizing apparatus; a low-pass filter for eliminating a noise mixed in an output voltage of the buffer; and a resistor for converting an output voltage of the low-pass filter into a current and providing both ends of the reference junction with the current. The reference-current optimizing apparatus may also include a preamplifier having a number of junction bipolar transistors.