Charge Pump Ripple Control Circuit
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Solution Overview
Problem
Prior art charge pump circuits lack ripple control, resulting in unstable output voltages due to significant ripples, which are unfavorable for downstream integrated circuits.
Innovation Solution
A charge pump circuit is enhanced with a filter circuit and a ripple control circuit connected to the output terminal of the charge pump, utilizing NMOS transistors and capacitors to attenuate ripples and stabilize the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple filter circuit is applied to the output of a charge pump, then the circuit complexity remains low, but the output voltage stability deteriorates due to significant ripples
Solution Approach 1:
The patent implements a ripple control circuit that uses feedback mechanisms to detect and suppress output voltage ripples. The circuit monitors the charge pump output and dynamically adjusts control signals to NMOS transistors to attenuate ripple components, thereby improving output voltage stability without requiring a completely redesigned charge pump structure.
Solution Approach 2:
The patent introduces an intermediary ripple control circuit between the charge pump and the filter circuit. This intermediary circuit acts as a mediator that processes the charge pump output signal, applying ripple attenuation through controlled NMOS transistor switching before the signal reaches the final output, thus resolving the stability issue while maintaining overall circuit simplicity.
2Stability of the object's composition
If ripple control is added to reduce output voltage ripples, then the output voltage stability improves, but the device complexity increases due to additional circuits
Solution Approach 1:
The patent merges the ripple control functionality with the existing filter circuit and charge pump structure. The ripple control circuit shares common elements such as power supply connections, ground references, and signal paths with other circuit components, thereby reducing the net increase in device complexity while achieving effective ripple attenuation.
Solution Approach 2:
The ripple control circuit is designed with multi-functionality, serving both as a ripple attenuation mechanism and as part of the overall voltage regulation system. The NMOS transistors and control logic are integrated to perform multiple functions including ripple suppression, voltage clamping, and coordination with the filter circuit, thus minimizing the additional complexity introduced by ripple control.
3Device complexity
If only simple filtering is applied without ripple control, then the device complexity remains low, but the harmful ripples in output voltage increase
Solution Approach 1:
The patent converts the harmful ripple effect into a controllable signal by using the ripple itself as the basis for control. The ripple control circuit detects ripple components and uses this information to generate corrective control signals that activate NMOS transistors to counteract the ripple, thereby transforming the harmful effect into a useful feedback mechanism for ripple suppression.
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 addition of a ripple control circuit effectively reduces ripple amplitude, ensuring a relatively stable output voltage for the charge pump, benefiting downstream integrated circuits.
Implementation Method 1
a filter circuit connected to an output terminal of the charge pump for filtering an output voltage of the charge pump
Implementation Method 2
a ripple control circuit connected both to the output terminal of the charge pump and to the filter circuit for reducing the output voltage of the charge pump upon an increase thereof
Data Source
AI summary
A charge pump circuit includes a charge pump, a regulator circuit, and a load current, wherein the charge pump circuit further includes: a filter circuit connected to an output terminal of the charge pump for filtering an output voltage of the charge pump; and a ripple control circuit connected both to the output terminal of the charge pump and to the filter circuit for reducing the output voltage of the charge pump upon an increase thereof, thereby attenuating ripples contained in the output voltage of the charge pump. The charge pump circuit is capable of enabling a relatively stable output voltage for the charge pump, thus benefiting a downstream integrated circuit.