Current Feedback Charge Pump Circuit for Low-Voltage Stability
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Solution Overview
Problem
Conventional charge pump circuits face challenges with noise performance, power efficiency, and design complexity, especially when prioritizing stability and low-voltage operation, due to their reliance on operational amplifiers and voltage division circuits.
Innovation Solution
A power supply circuit incorporating a current feedback type charge pump circuit with a feedback loop, MOS transistor element, resistor, bias circuit, and control section, which eliminates the need for operational amplifiers and voltage division circuits, allowing for improved stability and reduced circuit area while enabling low-voltage operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the operational amplifier is designed in a wider band to prioritize stability, then stability is improved, but noise performance becomes worse
Solution Approach 1:
The patent extracts and removes the operational amplifier from the charge pump circuit, replacing it with a current feedback mechanism using simple current sources and switches. This eliminates the source of noise associated with wide-band operational amplifiers while maintaining stability through the current feedback loop.
2Productivity
If the operational amplifier is designed to supply large current to drive the charge pump circuit, then productivity is improved, but power efficiency becomes worse
Solution Approach 1:
The patent employs dynamic current control where the current source adjusts its output current based on the operating conditions and load requirements. This allows the circuit to supply sufficient current when needed while minimizing current consumption during normal operation, thereby improving power efficiency without sacrificing productivity.
3Adaptability or versatility
If a level shifter is added to adjust output voltage in conventional charge pump circuit, then adaptability is improved, but device complexity becomes worse
Solution Approach 1:
The patent implements a multi-functional current feedback mechanism that simultaneously provides voltage regulation, current control, and adaptability to different operating conditions. By using the same feedback loop for multiple purposes, the circuit achieves versatility without adding separate level shifters or adjustment circuits, thereby avoiding increased complexity.
Data Source
AI summary
A charge pump circuit by which fundamental issues involved in the voltage feedback type charge pump circuit have been solved is realized. A power supply circuit includes a charge pump circuit, a feedback circuit feeding an output of the charge pump circuit back to an input of the charge pump circuit, a first current source causing a constant current to flow through the feedback circuit, a MOS transistor element interposed in a middle of the feedback circuit, a resistor element interposed at a position closer to the output of the charge pump circuit than the MOS transistor element in the feedback circuit, a bias circuit applying a constant voltage to a control terminal of the MOS transistor element, and a control section controlling a value of the constant current which the first current source flows through the feedback circuit.