Multi-Level Pulser Circuit for Faster Intermediate Voltage Transitions
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Solution Overview
Problem
Conventional multi-level pulsers struggle with rapidly driving the output node from a positive voltage level to a lower positive voltage and from a negative voltage level to a less negative voltage, resulting in reduced output load driving capability, especially during falling transitions between positive voltage levels and rising transitions between negative voltage levels.
Innovation Solution
A multi-level pulser circuit with control circuitry that selectively couples the output pin to input pins and a reference input pin during specific voltage transitions, utilizing a combination of p-channel and n-channel MOS transistors with diodes to enable bidirectional current paths, allowing for improved voltage transitions without additional silicon area or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional multi-level pulser architecture is used, then device complexity is reduced, but output load driving capability during falling transitions between positive voltage levels and rising transitions between negative voltage levels deteriorates
Solution Approach 1:
The patent implements dynamic control of current paths by selectively activating different transistor combinations based on the required voltage transition direction. The control circuitry dynamically switches between unidirectional and bidirectional current path configurations, enabling the output node to rapidly discharge during falling transitions and rapidly charge during rising transitions, thereby improving output load driving capability without permanently increasing device complexity
Solution Approach 2:
The patent introduces an intermediate reference voltage level (e.g., ground or zero voltage) that serves as a mediator for bidirectional transitions. By using this reference level as an intermediate step, the pulser can achieve rapid voltage transitions in both directions by sequentially switching through the reference level, effectively improving productivity without requiring direct bidirectional switching paths for all transitions
2Device complexity
If conventional unidirectional current paths are used, then device complexity is reduced, but speed of voltage transitions in falling transitions between positive voltage levels and rising transitions between negative voltage levels deteriorates
Solution Approach 1:
The patent implements dynamic control of current paths by selectively activating different transistor combinations based on the required voltage transition direction. The control circuitry dynamically switches between unidirectional and bidirectional current path configurations, enabling the output node to rapidly discharge during falling transitions and rapidly charge during rising transitions, thereby improving output load driving capability without permanently increasing device complexity
Solution Approach 2:
The patent segments the voltage transition process into multiple controllable stages by dividing the current paths into separate unidirectional paths (positive direction path and negative direction path). Each path is independently controlled by dedicated transistors, allowing optimized transition speed for each direction while maintaining manageable device complexity through modular segmentation
3Productivity
If bidirectional pulsers are used to improve output load driving capability, then voltage transition performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements dynamic control of current paths by selectively activating different transistor combinations based on the required voltage transition direction. The control circuitry dynamically switches between unidirectional and bidirectional current path configurations, enabling the output node to rapidly discharge during falling transitions and rapidly charge during rising transitions, thereby improving output load driving capability without permanently increasing device complexity
Solution Approach 2:
The patent makes the unidirectional current paths multi-functional by enabling them to operate in both forward and reverse directions through selective transistor activation. The same physical current path infrastructure serves multiple purposes (charging and discharging) depending on the control signals applied, achieving bidirectional functionality without duplicating the entire circuit 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 solution enhances the output load driving capability, enabling rapid voltage transitions independently of the output load, improving the quality and performance of applications by maintaining a robust target output voltage profile while reducing design complexity and cost compared to conventional bidirectional pulsers.
Implementation Method 1
utilizing a combination of p-channel and n-channel MOS transistors with diodes to enable bidirectional current paths
Implementation Method 2
utilizing a combination of p-channel and n-channel MOS transistors with diodes to enable bidirectional current paths
Data Source
AI summary
A multi-level pulser circuit comprises a set of first input pins for receiving respective positive voltage signals at different voltage levels, a set of second input pins for receiving respective negative voltage signals at different voltage levels, and a reference input pin configured to receive a reference voltage signal intermediate the positive voltage signals and the negative voltage signals. The circuit comprises an output pin configured to supply a pulsed output signal. The circuit further comprises control circuitry configured to selectively couple the output pin to one of the first input pins, the second input pins and the reference input pin to generate the pulsed output signal at the output pin. The control circuitry is further configured to selectively couple at least one of the second input pins and the reference input pin to the output pin during falling transitions of the pulsed output signal between two positive voltage levels, and selectively couple at least one of the first input pins and the reference input pin to the output pin during rising transitions of the pulsed output signal between two negative voltage levels.