Multi-Level Pulser Circuit With Bidirectional Transition Paths
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Solution Overview
Problem
Conventional multi-level pulsers struggle to rapidly drive their output node from a positive voltage level to a lower positive voltage or from a negative voltage level to a less negative voltage, resulting in limited 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
1Reliability
If conventional multi-level pulser architecture is used, then the circuit structure remains simple, but the output load driving capability deteriorates during falling transitions between positive voltage levels and rising transitions between negative voltage levels
Solution Approach 1:
The pulser circuit is segmented into multiple independent voltage level sources (first set of input pins for positive levels, second set of input pins for negative levels, and reference input pin). Each segment can be selectively coupled to the output node through control circuitry, allowing independent optimization of each voltage level path without increasing overall circuit complexity.
Solution Approach 2:
The control circuitry dynamically selects which voltage level to couple to the output node based on the desired transition. During falling transitions between positive voltage levels, the control circuitry selectively couples the reference input pin or negative voltage levels to accelerate the discharge. During rising transitions between negative voltage levels, it selectively couples positive voltage levels to accelerate the charge, making the circuit adaptive to different transition requirements.
2Speed
If conventional multi-level pulser is used, then the circuit design remains straightforward, but the voltage transition speed deteriorates when discharging the output load
Solution Approach 1:
The circuit pre-prepares multiple voltage level paths (positive, negative, and reference) that can be rapidly switched to the output node. The control circuitry is pre-configured to know which path to activate for charging versus discharging scenarios, enabling immediate response without complex real-time calculations or additional switching elements.
Solution Approach 2:
The reference input pin and voltage level input pins serve multiple functions: they can be used for both charging the output load and discharging it, depending on the transition requirements. This multi-functionality allows the same circuit structure to handle both rising and falling transitions efficiently without requiring separate dedicated paths for each operation.
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 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.