Switchable Filter Precharge Circuit for Minimal Switching Transients
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Solution Overview
Problem
Existing technologies face challenges in switching filters into signal paths without generating detrimental transients, which disrupt the fine tuning of sensitive devices like quantum computers and qubit systems, requiring slow and complex tuning processes.
Innovation Solution
A switchable capacitor assembly with a voltage follower and two switches, where the capacitor is initially connected to a resistor and then to a terminal, using a second switch to short circuit the resistor and minimize voltage differences, allowing for fast switching without transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is switched into a signal path using conventional methods, then the filter can be activated to filter signals, but detrimental transients are generated that disrupt the fine tuning of sensitive devices
Solution Approach 1:
The voltage follower precharges the capacitor to the signal path voltage level before the switch closes, eliminating voltage differences that would cause transients. This preliminary action ensures the capacitor is ready to be connected without generating harmful voltage spikes or dips.
Solution Approach 2:
The voltage follower acts as an intermediary between the signal path and the capacitor, buffering and precharging the capacitor to match the signal path voltage. This intermediary component isolates the switching action from the signal path, preventing transient generation.
2Reliability
If the tuning process is slowed down to avoid transients, then device stability is maintained, but the tuning speed and productivity decrease
Solution Approach 1:
The voltage follower precharges the capacitor before switching, allowing fast switching without transients. This eliminates the need for slow tuning processes, enabling rapid reconfiguration while maintaining device stability.
Solution Approach 2:
The circuit dynamically switches between two states (capacitor connected to signal path or disconnected) without generating transients during the transition. This dynamic switching capability enables fast tuning while maintaining stability.
3Measurement precision
If multiple voltages are tuned sequentially to avoid transients, then each voltage can be optimized, but the overall tuning time increases
Solution Approach 1:
The voltage follower precharges all capacitors to their respective signal path voltages before switching, allowing multiple voltages to be optimized simultaneously without transients. This eliminates the need for sequential tuning, reducing total tuning time while maintaining precision.
Solution Approach 2:
Multiple filter circuits with voltage followers are combined into a single system that can be configured simultaneously. The voltage followers enable independent precharging of each capacitor, allowing parallel optimization of multiple voltages without interference or transient generation.
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
Enables faster and more precise tuning of devices by reducing transients during filter activation, allowing for quicker signal variation and optimization of multiple voltages without disrupting the device's state.
Implementation Method 1
A voltage follower may be embodied in many manners. A presently preferred type of voltage follower comprises an amplifier. This has the advantage that the powering of the voltage follower may be separate from any signal received on the first terminal. The voltage follower may determine or detect the voltage on the first terminal and may output, on an output, a voltage corresponding more or less to that voltage.
Implementation Method 2
a capacitor operatively connected between the first switch and the second terminal
Implementation Method 3
the first resistor being operatively connected between the voltage follower and the first switch
Data Source
AI summary
A switching or switchable filter configured to switch in and out a filter with a minimal transient, the filter comprising a capacitor charged via a voltage follower. A resistor between the capacitor and the voltage follower may be short-circuited.