Switched-Capacitor Gain Adjustment for Stable Loop Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Switched capacitor amplifying circuits face challenges in maintaining stable DC gain due to environmental variations, affecting the loop gain between the output and input signals.
Innovation Solution
A switched capacitor amplifying apparatus and method with a gain adjustment mechanism that includes a level-shifting capacitor array controlled by a control circuit to adjust equivalent capacitance, compensating for variations in DC gain by determining the enabling combination of level-shifting capacitors to stabilize loop gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a switched capacitor amplifying circuit uses an operational amplifier and capacitors to amplify the input signal, then signal amplification is achieved, but the DC gain becomes unstable due to environmental variations
Solution Approach 1:
The patent implements a feedback mechanism where the output signal is fed back through the level-shifting capacitor array to the input side of the amplifier. This feedback loop allows the system to automatically adjust and compensate for DC gain variations caused by environmental changes, thereby stabilizing the overall amplification while maintaining signal amplification capability.
Solution Approach 2:
The patent introduces a level-shifting capacitor array that can dynamically adjust its capacitance parameters in response to environmental variations. By changing the effective capacitance values in the feedback path, the system compensates for DC gain drift and maintains stable amplification performance under different operating conditions.
2Adaptability or versatility
If the DC gain of the operational amplifier varies due to environmental issues, then the amplifier can adapt to different conditions, but the loop gain between output and input signal is simultaneously affected
Solution Approach 1:
The feedback path incorporating the level-shifting capacitor array creates a self-regulating system that senses output variations and adjusts the loop gain accordingly. When environmental changes cause DC gain variation, the feedback mechanism automatically compensates to maintain stable loop gain, allowing environmental adaptation without compromising loop stability.
Solution Approach 2:
The system employs preliminary anti-action by pre-configuring the level-shifting capacitor array to counteract expected environmental variations. The capacitor array is designed to provide compensating effects before environmental changes fully impact the amplifier, thereby maintaining loop gain stability while allowing operational adaptability.
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
The apparatus effectively stabilizes loop gain by adjusting the equivalent capacitance of the level-shifting capacitor array in response to DC gain variations, ensuring consistent signal amplification performance.
Implementation Method 1
The sampling capacitor circuit includes two sampling input terminals and a sampling output terminal, wherein the two sampling input terminals receive and sample an input signal from the signal input terminal
Implementation Method 2
The load capacitor and the level-shifting capacitor array generate a plurality of connection relations with the output terminal of the amplifier, such that the load capacitor and the level-shifting capacitor array are respectively charged according to an output from the output terminal of the amplifier
Data Source
AI summary
The present invention discloses a switched capacitor amplifying apparatus having gain adjustment mechanism. An amplifier includes an input terminal and an output terminal. A capacitor circuit includes a sampling capacitor circuit, a load capacitor and a level-shifting capacitor array. The sampling capacitor circuit includes two sampling input terminals and a sampling output terminal to receive an input signal from a signal input terminal and output a sampled result to the input terminal of the amplifier. The load capacitor and the level-shifting capacitor array are charged according to the output terminal of the amplifier and the load capacitor is subsequently charged by the level-shifting capacitor array to accomplish level-shifting such that the load capacitor generates an output signal through a signal output terminal. A control circuit determines an enabling combination of level-shifting capacitors included in the level-shifting capacitor array to determine an equivalent capacitance, to further determine a loop gain.