Bootstrap Circuit Initial Gate Boost Against Parasitic Capacitance
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Solution Overview
Problem
Conventional bootstrap circuits face challenges due to parasitic capacitance at output nodes, which can prevent the booting voltage from reaching the desired level, affecting the operation of subsequent circuits.
Innovation Solution
A bootstrap circuit design that includes a receiving circuit, a switched capacitor module, and a booting circuit, where the booting circuit applies an initial voltage to the transistor's gate electrode when the control signal starts, enhancing the voltage level of the control signal and mitigating the impact of parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional bootstrap circuit uses a switched capacitor to generate booting voltage, then the circuit structure is simple, but parasitic capacitance at output nodes prevents the booting voltage from reaching the desired level
Solution Approach 1:
The bootstrap circuit is divided into distinct functional modules: a switched capacitor module for voltage generation, a receiving circuit for signal reception, and a booting circuit for voltage boosting. This segmentation allows each module to be optimized independently, with the booting circuit specifically designed to compensate for parasitic capacitance effects and ensure the control signal reaches the desired voltage level.
Solution Approach 2:
The booting circuit applies an initial voltage to the transistor gate electrode before the control signal fully activates, preparing the transistor for optimal operation. This preliminary action ensures that when the control signal arrives, the transistor is already in a state that minimizes the impact of parasitic capacitance, allowing the booting voltage to reach the target level accurately.
2Reliability
If parasitic capacitance is present at output nodes, then the circuit operation is influenced negatively, but adding compensation circuits increases device complexity
Solution Approach 1:
The booting circuit is integrated with the switched capacitor module and receiving circuit to form a unified bootstrap circuit. The booting circuit combines voltage generation, signal reception, and voltage boosting functions in a coordinated manner, reducing the need for separate compensation circuits while maintaining reliable operation despite parasitic capacitance.
Solution Approach 2:
The booting circuit automatically detects and compensates for voltage level deficiencies caused by parasitic capacitance without requiring external intervention or complex control mechanisms. The circuit self-regulates to ensure the control signal reaches the desired level, maintaining reliability while keeping the overall structure relatively simple.
3Ease of operation
If the control signal voltage level is insufficient due to parasitic capacitance, then transistor switching performance deteriorates, but increasing voltage generation capability may cause energy loss
Solution Approach 1:
The booting circuit operates periodically, applying initial voltage boosts only when needed during transistor switching transitions. This periodic action ensures optimal transistor switching performance by providing voltage support at critical moments while avoiding continuous energy consumption that would occur with constant voltage generation.
Solution Approach 2:
The booting circuit dynamically adjusts voltage parameters based on the operating state of the transistor and the magnitude of parasitic capacitance effects. By changing voltage levels adaptively rather than maintaining a constant high voltage, the circuit achieves good transistor switching performance while minimizing energy loss during non-critical periods.
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
This design improves the linearity and signal quality of the output signal, making it more suitable for subsequent circuits by ensuring the control signal reaches the desired level, thereby enhancing the performance of the bootstrap circuit.
Implementation Method 1
parasitic capacitance at output nodes of the switched capacitor
Implementation Method 2
the booting circuit is coupled to the receiving circuit, and is arranged for applying an initial voltage when the control signal starts to enable the transistor, to increase a voltage level of the control signal
Data Source
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AI summary
A bootstrap circuit (100) including a receiving circuit (110), a switched capacitor module (120) and a booting circuit (130) is provided. The receiving circuit receives an input signal (Vin) to selectively output an output signal (Vout) according to a control signal (Vc'). The switched capacitor module is coupled to the input signal, and is arranged for generating the control signal (Vc) according to the input signal. The booting circuit is coupled to the receiving circuit, and is arranged for applying an initial voltage (Vib) when the control signal starts to enable the transistor, to increase a voltage level of the control signal.