Switched-Capacitor Charge Compensation for Faster Settling
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Solution Overview
Problem
Conventional switched-capacitor circuits are inefficient and ineffective due to high power consumption and complex circuitry required to manage transient currents during switching, which affects voltage ripple and settling time.
Innovation Solution
A charge compensation system for switched-capacitor circuits that utilizes a switched capacitor compensation circuit to provide the required charge during switching events, reducing the burden on the reference voltage source and improving settling time by using a replica reference voltage and switch control logic to manage capacitor switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional switched-capacitor circuits are used, then the basic switching function is achieved, but power consumption is high and circuit complexity increases
Solution Approach 1:
A charge compensation circuit is introduced as an intermediary component between the reference voltage source and the switched-capacitor circuit. This compensation circuit captures transient current spikes during switching events and redistributes the charge, preventing direct draw from the reference source. The intermediary charge compensation mechanism reduces power consumption while maintaining circuit functionality without adding significant complexity.
Solution Approach 2:
The charge compensation circuit performs preliminary charge storage and redistribution before the main switching operation completes. By anticipating and pre-managing the charge requirements during switching transitions, the system avoids the need for high-power reference sources and reduces overall power consumption while simplifying the reference generator design.
2Reliability
If conventional switched-capacitor circuits manage transient currents, then switching function is maintained, but settling time is affected and voltage ripple increases
Solution Approach 1:
The charge compensation circuit acts as a buffer intermediary that absorbs transient current variations and provides stable voltage to the switched-capacitor circuit. By mediating between the reference source and the switching elements, it reduces voltage ripple and accelerates settling time without compromising voltage stability during transitions.
Solution Approach 2:
The charge compensation circuit performs multiple functions simultaneously: it reduces voltage ripple, accelerates settling time, and maintains voltage stability during switching events. This multi-functional approach improves overall reliability while addressing multiple performance parameters through a single circuit mechanism.
Data Source
AI summary
Methods and systems for charge compensation for switched-capacitor circuits may comprise, in an electronics device comprising a first voltage source, a switched capacitor load, and a switched capacitor compensation circuit: switching a capacitor in the switched capacitor load from a first voltage to a second voltage; providing a charge to the switched capacitor load from the switched capacitor compensation circuit without requiring added charge from the first voltage source. A reference voltage may be generated utilizing the first voltage source. A replica reference voltage for the switched capacitor compensation circuit may be generated utilizing a second voltage source. The replica reference voltage may be equal to the reference voltage. The replica reference voltage may be equal to a supply voltage, VDD, for circuitry in the electronics device. Capacitors may couple outputs of the first and second voltage sources to ground.