Bias Tee Discharge Circuit for Fast Capacitor Reset
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Solution Overview
Problem
Existing bias tees face challenges in quickly and efficiently discharging the bias tee capacitor, leading to signal distortion and limited repetition rate of pulse signals due to prolonged discharge times.
Innovation Solution
A circuit arrangement with a bias tee and a discharge circuit that includes an input AC terminal with a bias tee capacitor, an input DC terminal, and an output interface, along with a discharge circuit that enables a discharge time of less than 40 ns, significantly faster than conventional bias tees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a negative pulse is applied to discharge the bias tee capacitor, then the discharge speed is improved (twice as fast), but a corresponding negative pulse appears on the output signal which can be problematic
Solution Approach 1:
The patent introduces a discharge circuit as an intermediary component that provides a dedicated discharge path for the bias tee capacitor. This discharge circuit includes a switch that can be controlled to connect the capacitor to ground through a discharge resistor, allowing the capacitor to discharge without affecting the main signal path. The intermediary discharge circuit isolates the discharge operation from the output signal, enabling fast discharge while preventing harmful negative pulses from appearing on the output.
2Reliability
If the width of the negative pulse corresponds to the sum of pulse widths in the pulse signal, then the capacitor is fully discharged, but the repetition rate of pulse signals is limited
Solution Approach 1:
The patent implements a dynamic discharge mechanism where the discharge circuit can be independently controlled with adjustable timing. The switch in the discharge circuit can be activated for a specific duration after the main pulse signal, allowing the capacitor to discharge completely without extending the overall signal cycle. This dynamic control separates the discharge timing from the pulse signal width, enabling both complete discharge and high repetition rates by adjusting the discharge pulse width independently.
3Stability of the object's composition
If pre-compensation is applied to increase voltage stability, then the DC bias stability is improved, but the bias tee capacitor gets charged quicker requiring more power
Solution Approach 1:
The patent extracts the capacitor charging issue from the main signal path by providing a separate discharge path through the discharge circuit. Instead of relying on pre-compensation to manage capacitor charging effects, the system allows the capacitor to charge naturally during pulse transmission while providing a dedicated discharge path that quickly removes the accumulated charge. This separation eliminates the need for excessive voltage compensation and reduces power consumption while maintaining DC bias stability.
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 proposed solution achieves a discharge time that is twice as fast as conventional bias tees, reducing signal distortions and enabling a higher repetition rate of pulse signals, thus improving the control and stability of qubits in quantum computing applications.
Implementation Method 1
the input AC terminal comprises a bias tee capacitor
Data Source
AI summary
The present invention relates to a circuit arrangement comprising: a bias tee having an input AC terminal comprising a bias tee capacitor, wherein the input AC terminal is adapted to receive at least one AC signal, wherein the AC signal comprises at least one of a positive pulse train signal and a negative discharge pulse signal; an input DC terminal, adapted to receive at least one bias DC signal; and an output interface, adapted to output a signal based on the received AC signal and the received bias DC signal, and a discharge circuit, adapted to discharge the bias tee capacitor.