Switched Capacitor Amplifier Topology for Two-Stage Double Gain
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Solution Overview
Problem
Conventional ratio-independent switched capacitor amplifiers require four stages of operation to achieve double gain, making them unsuitable for high-speed applications.
Innovation Solution
A ratio-independent switched capacitor amplifier design that uses two stages, one sampling stage and one amplification stage, to double amplify input signals by sampling and doubling input voltages during specific intervals and outputting the amplified difference via a differential amplifier circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ratio-independent switched capacitor amplifier uses four stages of operation to achieve double gain, then the gain precision is improved, but the operating speed deteriorates
Solution Approach 1:
The patent merges the sampling and amplification operations into a single integrated stage. The first sampling circuit samples the first input voltage while simultaneously the second sampling circuit samples the second input voltage, and the differential amplifier circuit immediately amplifies the difference. This consolidation eliminates the sequential four-stage process, achieving double gain in one stage while maintaining high operating speed.
Solution Approach 2:
The patent performs preliminary sampling of both input voltages simultaneously before amplification. The sampling circuits capture the input voltages during specific intervals, preparing the signals in advance for the differential amplifier. This preliminary action allows the amplification stage to operate continuously without waiting for sequential processing, thereby improving operating speed while maintaining precision.
2Manufacturing precision
If a conventional switched capacitor amplifier uses sequential sampling and charging stages, then the gain accuracy is improved, but the processing time increases
Solution Approach 1:
The patent implements continuous useful action by having the differential amplifier circuit continuously amplify the difference between the sampled input voltages without interruption. The sampling circuits operate in parallel and feed directly into the amplifier, eliminating idle time between stages. This continuous operation reduces processing time while maintaining gain accuracy through the precise differential amplification of the sampled signals.
3Measurement precision
If a ratio-independent switched capacitor amplifier uses multiple operational stages, then the double gain is achieved, but the circuit complexity increases
Solution Approach 1:
The patent makes the sampling circuits universal by designing them to simultaneously perform sampling and preparation for amplification. The first sampling circuit and second sampling circuit are structurally identical and operate in parallel, each capable of sampling their respective input voltages. This universal design achieves the required double gain functionality while reducing overall circuit complexity through symmetry and reusability of the same circuit topology.
Data Source
AI summary
A ratio-independent switched capacitor amplifier includes a first sampling circuit configured to sample a first input voltage as a first sampling voltage and to double a level of the first sampling voltage during an interval in which the first input voltage is cut off; a second sampling circuit configured to sample a second input voltage as a second sampling voltage and to double a level of the second sampling voltage during an interval in which the second input voltage is cut off; and a differential amplifier circuit configured to output a difference between the first sampling voltage and the second sampling voltage.