Bootstrapped Switch Circuit With Shared Charge Pump Control
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Solution Overview
Problem
Existing bootstrapped switch circuits require a large number of charge pumps and CMOS logic, leading to high power consumption and large circuit areas, especially in systems with multiple switches, which complicates the implementation of sampling switches for differential analog signals.
Innovation Solution
A bootstrapped switch circuit is designed with a charge pump and logic circuit that generates multiple control signals, allowing independent control of switches in the voltage path, and is electrically isolated from the power supply, reducing the need for multiple charge pumps and logic circuits, thereby minimizing area and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple charge pumps and logic circuits are used to control multiple switches, then independent control of each switch is achieved, but circuit area and power consumption increase significantly
Solution Approach 1:
The patent combines multiple charge pumps into a single shared charge pump that generates a common bootstrapped voltage. Multiple switches share this single charge pump and logic circuit, eliminating the need for separate charge pumps for each switch. This merging approach reduces circuit area while maintaining independent control capability through shared voltage generation and control logic.
Solution Approach 2:
The single charge pump and logic circuit are designed to serve multiple switches simultaneously. The bootstrapped voltage generated by the single charge pump can control multiple switches in sequence or parallel, making the charge pump and logic circuit universal components that perform multiple functions across different switch control scenarios.
2Ease of operation
If multiple charge pumps and logic circuits are used to control multiple switches, then independent control of each switch is achieved, but power consumption increases
Solution Approach 1:
The patent merges multiple power-consuming charge pumps into a single shared charge pump. Since charge pumps are significant power consumers in bootstrapped switch circuits, consolidating them reduces total power consumption. The single charge pump serves multiple switches, eliminating redundant power consumption from multiple separate charge pumps while maintaining independent switch control through shared voltage generation.
3Area of stationary object
If a single charge pump is shared by multiple switches, then circuit area and power consumption are reduced, but control complexity increases
Solution Approach 1:
The patent introduces a logic circuit as an intermediary between the single charge pump and multiple switches. This logic circuit receives control signals and generates appropriate timing signals to drive the multiple switches in sequence or parallel. The logic circuit manages the complexity of coordinating multiple switches with a single charge pump, handling timing, sequencing, and control signal generation to simplify the overall control architecture.
4Area of stationary object
If bootstrapped switch circuit is electrically isolated from timing circuit power supply, then area and power efficiency are improved, but electrical isolation complexity increases
Solution Approach 1:
The patent segments the circuit into two electrically isolated domains: the timing circuit domain with its own power supply, and the bootstrapped switch circuit domain with isolated power supply. This segmentation allows independent optimization of each domain, reducing area and power consumption in the bootstrapped switch circuit while managing isolation complexity through defined boundaries and interfaces between the two isolated domains.
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 achieves area-efficient and power-efficient operation by reducing the number of charge pumps needed, enabling the use of bootstrapped switches in applications like ADC input stages with reduced propagation delays and improved performance in sampling high-frequency signals.
Implementation Method 1
a charge pump including an input coupled to the one or more input terminals of the bootstrapped switch circuit and the timing circuit, wherein the charge pump generates a charge pump voltage at an output of the charge pump
Data Source
AI summary
A bootstrapped switch circuit coupled to a timing circuit. The bootstrapped switch circuit comprises a charge pump coupled to the timing circuit. The bootstrapped switch circuit also comprises a logic circuit coupled to the output of the charge pump and the timing circuit. The logic circuit is capable of generating multiple control signals which can independently control the turn-on of switches in the voltage path between the inputs and outputs of the bootstrapped switch circuit.