Superconducting PTL Receiver Biasing for Wide Timing Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional passive transmission line (PTL) receivers struggle to align fluxons arriving from a PTL with specific phases of the clock signal, due to the absence of a bias current based on an input resistor.
Innovation Solution
A superconducting PTL receiver system is developed, comprising a receiver core with an input Josephson junction and an active bias circuit that generates a bias pulse based on a bias clock signal. This system includes an alignment Josephson transmission line to ensure proper phase alignment of the input pulse across a wide timing window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a PTL receiver uses an input resistor for biasing, then the circuit structure is simple, but the fluxon arrival time cannot be aligned with the clock signal phase
Solution Approach 1:
The system generates a bias pulse in advance based on the clock signal before the fluxon arrives. This preliminary bias pulse is stored in a capacitor and held ready, ensuring that when the fluxon arrives within the receiver window, the bias is already prepared for proper triggering, thus achieving timing alignment without complex real-time control
Solution Approach 2:
A capacitor is introduced as an intermediary element to store the bias pulse. This capacitor acts as a buffer that holds the bias voltage ready for the fluxon arrival, mediating between the clock signal generator and the Josephson junction to enable timing alignment while keeping the overall structure relatively simple
2Adaptability or versatility
If a PTL receiver lacks bias current alignment, then the device complexity is reduced, but the receiver window for pulse reception is limited
Solution Approach 1:
The bias pulse is generated in advance based on the clock signal and stored in a capacitor before the fluxon arrives. This preliminary preparation creates a extended receiver window, allowing the system to accept fluxons that arrive within this pre-established bias period, thus increasing adaptability without requiring complex real-time bias adjustment mechanisms
Solution Approach 2:
The system uses periodic clock signals to generate periodic bias pulses. This periodic generation of bias, synchronized with the expected fluxon arrival rhythm, creates consistent receiver windows that broaden the timing acceptance range while maintaining a relatively simple periodic control structure
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 system effectively aligns the input pulse from the PTL with the bias clock signal, providing a wide receiver window for pulse reception, thus overcoming the timing alignment challenges faced by conventional PTL receivers.
Implementation Method 1
The input Josephson junction can trigger to generate an intermediate pulse in response to the input and bias pulses
Implementation Method 2
The alignment Josephson junction can be configured to trigger to generate an output pulse in response to the intermediate pulse and the bias clock signal
Implementation Method 3
providing a DC bias current to a primary of a transformer of an active bias circuit to provide an induced bias current on a secondary of the transformer based on the DC bias current
Data Source
AI summary
One example includes a PTL receiver system. The system includes a receiver core that comprises an input Josephson junction and that receives an input pulse from a PTL. The system also includes an active bias circuit which generates a bias pulse based on a bias clock signal and provides the bias pulse to the receiver core. The bias pulse can have a pulse-width approximately one-half a period of the bias clock signal. The input Josephson junction can trigger to generate an intermediate pulse in response to the input and bias pulses. The system further includes an alignment JTL comprising at least one alignment Josephson junction. The alignment Josephson junction can be configured to trigger to generate an output pulse in response to the intermediate pulse and the bias clock signal to provide for reception of the input pulse across a wide timing window based on the bias pulse.