Charge Pump Regulator Buffer Circuit Reduces Residual Oscillations
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Solution Overview
Problem
Existing charge pump regulators face challenges in maintaining low quiescent current consumption and stability of regulated voltage across varying supply voltage levels, leading to significant residual oscillations and inefficiencies.
Innovation Solution
The integration of a step-down circuit and a buffer circuit with PMOS and NMOS transistors, controlled by a clock signal generator, between the switching signal generator and the charge pump circuit, along with a second charge pump circuit for enabling the feedback loop, helps in reducing residual oscillations and maintaining regulated voltage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a charge pump regulator is used to maintain low quiescent current consumption, then power efficiency is improved, but residual oscillations increase and voltage stability deteriorates
Solution Approach 1:
A buffer circuit is introduced as an intermediary between the control signal generator and the charge pump circuit. This buffer circuit isolates the charge pump from direct control signal variations, reducing residual oscillations while maintaining the low quiescent current characteristic of the charge pump regulator architecture.
Solution Approach 2:
The buffer circuit is designed to maintain a stable voltage level at its output regardless of variations in the control signal or load conditions. By creating an equipotential condition at the charge pump input, the circuit reduces voltage fluctuations and residual oscillations, thereby improving voltage stability without increasing power consumption.
2Adaptability or versatility
If the supply voltage varies, then adaptability is improved, but residual oscillations increase and regulation precision deteriorates
Solution Approach 1:
The buffer circuit is designed with dynamic characteristics that adapt to varying supply voltage conditions. The circuit maintains its voltage stabilizing function across a wide supply voltage range by dynamically adjusting its operating point, thereby maintaining regulation precision despite variations in input voltage.
Solution Approach 2:
The buffer circuit parameters are designed to remain effective across different supply voltage levels. By carefully selecting transistor sizes, biasing conditions, and circuit topology, the buffer maintains its ability to reduce residual oscillations and stabilize voltage regardless of the specific supply voltage level within the operating range.
Data Source
AI summary
The present disclosure relates to a regulator including a first transistor coupling an application node of a first power supply voltage to an output node of the regulator supplying a first regulated voltage; a feedback loop supplying a control signal to the first transistor and comprising a first charge pump circuit; a control signal generator of the first charge pump circuit; and a drop-down circuit between the control signal generator and the charge pump circuit.