Pumping Circuit Voltage Stability via Dynamic Oscillator Period Control
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Solution Overview
Problem
Pumping circuits face challenges in maintaining a constant pumping voltage despite changes in external power voltage, affecting their performance and noise levels.
Innovation Solution
A pumping circuit design that includes a charge pump and an oscillator with a voltage provider to control the period of the oscillation signal based on both internal and external power voltages, using a series of inverter units and a logical operator to maintain a constant pumping voltage by adjusting the oscillation signal's period in response to changes in external power voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pumping circuit uses a conventional oscillator design, then the circuit structure is simple, but the pumping voltage becomes unstable when external power voltage changes
Solution Approach 1:
The oscillator's oscillation period is made dynamically adjustable based on the external power voltage level. When the external power voltage changes, the oscillation period automatically adjusts accordingly, which in turn adjusts the charge pump's operation frequency to maintain stable pumping voltage output. This dynamic adaptation resolves the contradiction between voltage stability and structural simplicity.
Solution Approach 2:
The system implements feedback by using the external power voltage signal to control the oscillator's period. The external power voltage changes are detected and fed back to adjust the oscillation frequency, which then regulates the charge pump's charging/discharging cycles to maintain constant pumping voltage. This feedback mechanism ensures voltage stability without requiring complex additional control circuits.
2Reliability
If the oscillation signal period is fixed, then the oscillator design is simple, but the pumping voltage changes with external power voltage fluctuations
Solution Approach 1:
The oscillation period is transformed from a fixed parameter to a dynamic one that adapts to external power voltage changes. The oscillator circuit is designed such that its oscillation period varies in response to the external power voltage level, enabling the charge pump to adjust its operation frequency and maintain constant pumping voltage output despite external voltage fluctuations.
Solution Approach 2:
The key parameter being changed is the oscillation period of the oscillator. By making the oscillation period variable based on external power voltage conditions, the system achieves adaptability to external voltage changes. This parameter change propagates through the charge pump control, ultimately maintaining constant pumping voltage output across different external voltage conditions.
3Object-affected harmful factors
If the charge pump operates at fixed frequency, then the control circuit is simple, but noise increases when external power voltage changes
Solution Approach 1:
The charge pump's operation frequency is made dynamic by linking it to the oscillator's adjustable period. When external power voltage changes occur, the oscillation period adjusts accordingly, which automatically adjusts the charge pump's switching frequency. This dynamic frequency adjustment prevents noise generation that would occur with fixed-frequency operation under varying voltage conditions, while avoiding the need for complex noise filtering circuits.
Data Source
AI summary
A pumping circuit includes a charge pump configured to generate a pumping voltage based on a first voltage in response to an oscillation signal, and an oscillator configured to provide a period-controlled oscillation signal based on the first voltage and a second voltage.