Voltage Booster Circuit Segmentation for Ripple Reduction
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Solution Overview
Problem
Existing voltage booster circuits have poor voltage output characteristics, which negatively impact the performance of internal circuits in electronic devices, particularly due to the interference of load current on the output voltage.
Innovation Solution
A voltage booster circuit design utilizing two separate charge pumps, one for output voltage and another for load current, ensuring that the output voltage is not interfered with by the load current, thereby maintaining better voltage characteristics and reducing ripple voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single charge pump is used to provide both output voltage and load current, then the device complexity is reduced, but the output voltage characteristics deteriorate due to interference from load current
Solution Approach 1:
The patent divides the single charge pump into two separate charge pumps: a first charge pump dedicated to providing output voltage and a second charge pump dedicated to providing load current. This segmentation eliminates the interference between load current and output voltage, resolving the technical contradiction by improving output voltage characteristics while accepting increased device complexity.
2Device complexity
If load current is provided through the same charge pump as output voltage, then the circuit structure is simplified, but ripple voltage increases and voltage stability deteriorates
Solution Approach 1:
The patent segments the circuit into two independent charge pump paths: one path (first charge pump) dedicated to voltage output with stable characteristics, and another path (second charge pump) dedicated to load current delivery. This segmentation isolates the voltage generation from load current variations, thereby reducing ripple voltage and improving output voltage stability.
3Device complexity
If a single charge pump provides both voltage and current, then the number of components is minimized, but the performance of high-voltage circuits deteriorates
Solution Approach 1:
The patent employs two separate charge pumps to independently handle voltage provision and current delivery functions. This segmentation ensures that the first charge pump can optimize for voltage stability while the second charge pump optimizes for current delivery, thereby improving the overall performance of high-voltage circuits despite the increased component count.
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 stability and performance of the output voltage, reducing its interference from load current and minimizing ripple voltage, thus enhancing the performance of high-voltage circuits like rail-to-rail input amplifiers.
Implementation Method 1
a first charge pump (100), configured to be coupled to a first supply voltage (VDD1) and to provide a first bias current (IB1)
Implementation Method 2
a second charge pump (102), configured to be coupled to a second supply voltage (VDD2) and to provide the load current (ILOAD)
Data Source
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AI summary
The present application discloses a voltage booster circuit (10) and a related circuit, chip and wearable device. The voltage booster circuit has an output terminal (OUT), which provides an output voltage (VOUT) and a load current (ILOAD). The voltage booster circuit includes: a first charge pump (100), which provides a first bias current (IB1); a second charge pump (102), which provides the load current; an output voltage fixing circuit (110), which draws the first bias current from the first charge pump to the output terminal, wherein the output voltage fixing circuit fixes a first charge pump voltage (VPUMP1) of the first charge pump by fixing the first bias current and further fixes the output voltage based on the fixed first charge pump voltage; and a load current generation circuit (120), which draws the load current from the second charge pump to the output terminal based on a second charge pump voltage (VPUMP2) of the second charge pump.