Variable-Frequency Charge Pump for RF Noise Reduction
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Solution Overview
Problem
Conventional electric charge pump units operate in an open-loop mode, unable to adjust their working frequency based on load changes, leading to noise interference in radio frequency systems due to fixed clock signals, which cannot be optimized for speed and noise reduction simultaneously.
Innovation Solution
A variable-frequency electric charge pump unit is introduced, comprising a variable-frequency signal generator, an electric charge pump circuit, and a voltage detector, where the signal generator dynamically adjusts the clock signal frequency based on the output voltage detected by the voltage detector, allowing the unit to adapt to changing load conditions and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed-frequency clock signal is used in the electric charge pump circuit, then the circuit structure is simple, but noise interference increases in the radio frequency system
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed-frequency clock signal into a variable-frequency clock signal. The frequency of the clock signal is dynamically adjusted based on the output voltage of the electric charge pump circuit. This allows the system to adapt to different operating conditions and avoid fixed frequency noise interference in the radio frequency band, thereby reducing harmful noise while maintaining reasonable circuit complexity through feedback control.
Solution Approach 2:
The patent changes the frequency parameter of the clock signal from a fixed value to a variable value. By using a voltage-controlled oscillator (VCO) or similar frequency adjustment mechanism, the clock frequency is modulated according to the detected output voltage, enabling the system to operate at optimal frequencies that minimize noise interference while maintaining pumping efficiency.
2Speed
If the working frequency is increased to improve pumping speed, then the speed performance improves, but noise interference increases
Solution Approach 1:
The system dynamically adjusts the working frequency based on real-time output voltage detection. When high pumping speed is needed, the frequency increases; when noise reduction is prioritized, the frequency decreases. This dynamic adaptation allows the system to optimize the trade-off between pumping speed and noise generation according to actual operating conditions.
Solution Approach 2:
The patent implements a feedback control mechanism where the output voltage of the electric charge pump is detected and used to adjust the clock signal frequency. This closed-loop control enables the system to automatically optimize the working frequency, achieving high pumping speed when necessary while minimizing noise interference during normal operation, thus resolving the contradiction between speed and noise.
3Device complexity
If the electric charge pump operates in open-loop mode, then the control is simple, but the working frequency cannot be adjusted based on load changes
Solution Approach 1:
The patent transforms the open-loop control into a closed-loop control system by introducing voltage detection and frequency adjustment mechanisms. The output voltage is continuously monitored and fed back to adjust the clock signal frequency, enabling the electric charge pump to automatically adapt to load changes. This feedback mechanism provides load adaptation capability while maintaining relatively simple control through automatic regulation.
Solution Approach 2:
The electric charge pump system performs self-regulation by using its own output voltage to control its operating frequency. The detected output voltage directly influences the clock signal frequency, allowing the system to self-adjust and optimize performance based on its actual operating state without requiring complex external control, thus achieving load adaptation with minimal additional complexity.
Data Source
AI summary
A variable-frequency electric charge pump unit, a chip, and a communication terminal. The electric charge pump unit comprises a variable-frequency signal generator, an electric charge pump circuit, and a voltage detector connected in series. The variable-frequency signal generator outputs a clock signal for the electric charge pump circuit. The electric charge pump circuit generates an output voltage on the basis of the clock signal. The output voltage drives a load on the one hand and is connected to the voltage detector on the other hand. An output end of the voltage detector is connected to the variable-frequency signal generator. The working frequency of the variable-frequency signal generator can be adjusted dynamically on the basis of a requirement that a radiofrequency system work state has on the driving output of the electric charge pump unit.