Charge Pump with Level Shifter for Voltage Swing and Efficiency
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Solution Overview
Problem
Existing charge pumps, such as constant and capacitive push-pull charge pumps, face efficiency issues when dealing with large loading variations, failing to maintain operational efficiency with small loads and providing unstable output voltages due to limited control signal voltage swing.
Innovation Solution
A charge pump design featuring a level shifter and charge exchange control switching circuit with capacitors and switches that provide a full voltage swing, stabilizing the output voltage and enhancing operational efficiency by reducing settling time through a CMOS structure and parallel configuration of charge pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant charge pump is used to accurately generate output voltage, then voltage accuracy is improved, but operational efficiency greatly attenuates with small load and may not function normally with large load
Solution Approach 1:
The patent applies dynamics by making the charge pump circuit configurable between different operating modes (constant charge mode and push-pull mode) based on load conditions. The circuit transitions from a fixed design to a dynamic one that adapts its characteristics to match the required operating conditions, thereby maintaining both voltage accuracy and operational efficiency across varying load ranges.
Solution Approach 2:
The patent changes the operating parameters of the charge pump by switching between different circuit configurations. By adjusting the circuit mode (constant charge vs. push-pull) according to load requirements, the system optimizes the balance between voltage accuracy and operational efficiency, resolving the contradiction between these two parameters.
2Productivity
If a capacitive push-pull charge pump is used to automatically adjust control signal amplitude, then operational efficiency is improved, but control signal voltage swing is limited and output voltage becomes unstable
Solution Approach 1:
The patent applies dynamics by enabling the charge pump to switch between constant charge mode (providing stable output voltage) and push-pull mode (providing high operational efficiency) based on load conditions. This dynamic adaptation allows the system to maintain output voltage stability while preserving operational efficiency across different operating ranges.
Solution Approach 2:
The patent segments the operating range into different modes: constant charge mode for conditions requiring voltage stability and push-pull mode for conditions prioritizing efficiency. By dividing the operational characteristics into separate configurable modes, the system can select the appropriate segment for each operating condition, resolving the contradiction between stability and efficiency.
3Measurement precision
If the charge pump is designed for best performance with slight loading variation, then voltage accuracy is improved, but adaptability to large loading variations deteriorates
Solution Approach 1:
The patent applies dynamics by making the charge pump circuit configurable between different operating modes (constant charge mode and push-pull mode) based on load conditions. The circuit transitions from a fixed design to a dynamic one that adapts its characteristics to match the required operating conditions, thereby maintaining both voltage accuracy and operational efficiency across varying load ranges.
Solution Approach 2:
The patent achieves universality by designing a charge pump that can operate in multiple modes (constant charge mode and push-pull mode) to serve different loading conditions. This multi-functional capability allows the same circuit to maintain voltage accuracy for slight loading variations while also adapting to large loading variations, thereby resolving the contradiction between precision and adaptability.
Data Source
AI summary
A charge pump includes a level shifter and a charge exchange control switching circuit. The level shifter can enhance the levels of a first and second clock signals, and output a first and a second control signal corresponding to the enhanced signals. Based on the first and second control signals, the charge exchange control switching circuit amplifies an input voltage and generates a corresponding amplified output voltage.