Switched-Capacitor Amplifier Level-Shifting With Charge Neutralization
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Solution Overview
Problem
Switched capacitor amplifier circuits face instability in output voltage due to insufficient current supplying ability when switch operations are performed, affecting the amplification of input signals.
Innovation Solution
Incorporating an electrical charge neutralizing capacitor between the output terminals of the amplifier, which charges and provides electrical charges to the level-shifting capacitors during the level-shifting period, enhancing the current supplying ability and stabilizing the voltage of the level-shifting capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If switch operation of capacitor circuit is performed to amplify input signal, then gain amplification is achieved, but current supplying ability becomes insufficient and output voltage becomes unstable
Solution Approach 1:
The electrical charge neutralizing capacitor pre-charges the level-shifting capacitors during the first non-overlapping clock period before the switching operation begins. This preliminary charging action ensures that when the switch operation commences, the level-shifting capacitors already possess sufficient charge to maintain stable output voltage, thereby resolving the contradiction between achieving gain amplification and maintaining output voltage stability.
Solution Approach 2:
The electrical charge neutralizing capacitor acts as an intermediary charge storage element between the power supply and the level-shifting capacitors. It mediates the charge transfer process by storing electrical charge during the first non-overlapping clock period and subsequently supplying this charge to the level-shifting capacitors, thereby enhancing current supplying ability and ensuring output voltage stability during the amplification process.
2Speed
If level-shifting capacitor charges load capacitor to accomplish level-shifting, then output signal is generated, but speed of level-shifting is insufficient
Solution Approach 1:
The electrical charge neutralizing capacitor performs preliminary charging of the level-shifting capacitors during the first non-overlapping clock period. By pre-charging these capacitors before the main level-shifting operation, the capacitors are ready to rapidly charge the load capacitor when needed, thereby increasing the speed of level-shifting while maintaining voltage stability through the pre-established charge reservoir.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the speed of level-shifting by stabilizing the voltage of the level-shifting capacitors, thereby enhancing the overall performance of the switched capacitor amplifier.
Implementation Method 1
an electrical charge neutralizing capacitor coupled between the two output terminals of the amplifier. The electrical charge neutralizing capacitor is configured to receive electrical charges from the two output terminals of the amplifier in the estimation period and provide the electrical charges to the level-shifting capacitor
Data Source
AI summary
The present disclosure discloses a switched capacitor amplifier apparatus for improving level-shifting. An amplifier includes input terminals and output terminals. Two capacitor circuits correspond to signal input terminals and signal output terminals and each includes a sampling capacitor circuit, a load capacitor and a level-shifting capacitor. The sampling capacitor circuit samples an input signal from one of the signal input terminals to one of the input terminals. An electrical charge neutralizing capacitor is coupled between the output terminals. The load capacitor and the level-shifting capacitor are charged according to an output from one of the output terminals in an estimation period. The level-shifting capacitor charges the load capacitor in a level-shifting period to generate an output signal at one of the signal output terminals. The electrical charge neutralizing capacitor receives and provides electrical charges from the output terminals to the level-shifting capacitor respectively in the estimation period and the level-shifting period.