Dual-Amplifier Sample-and-Hold Circuit for Low Voltage Error
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Solution Overview
Problem
Existing sample and hold circuits experience high error rates between input and output voltages due to the use of a single amplifier for both sampling and holding operations.
Innovation Solution
The implementation of a dual-amplifier configuration, where a first amplifier performs the sampling operation and a second amplifier performs the holding operation, reducing the error rate by optimizing the voltage gain relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single amplifier is used for both sampling and holding operations, then the device complexity is reduced, but the measurement precision deteriorates due to high error rates between input and output voltages
Solution Approach 1:
The patent divides the single amplifier into two separate amplifiers: a first amplifier dedicated to sampling operations and a second amplifier dedicated to holding operations. This segmentation allows each amplifier to be optimized for its specific function, reducing the error rate between input and output voltages while maintaining manageable device complexity through functional separation.
2Measurement precision
If a dual-amplifier configuration is used, then the measurement precision is improved by reducing error rates, but the device complexity increases
Solution Approach 1:
The patent implements segmentation by creating two distinct amplifier circuits with separate functions. The first amplifier handles sampling with its dedicated capacitor network, while the second amplifier handles holding operations. This functional segmentation achieves superior voltage accuracy (reducing error rates from 9.09% to 0.83% for gain=10) while keeping each amplifier module relatively simple and independent.
3Power
If the sampling operation is performed with high voltage gain, then the signal amplification is improved, but the error rate between input and output voltages increases
Solution Approach 1:
The patent separates the high-gain sampling operation (first amplifier) from the precision holding operation (second amplifier). This allows the first amplifier to achieve high voltage gain for signal amplification while the second amplifier corrects and stabilizes the output voltage, thereby maintaining both high power amplification and low error rates simultaneously.
Solution Approach 2:
The patent employs feedback mechanisms where the second amplifier uses the sampled voltage from the first amplifier to generate a corrected output voltage. The feedback loop compares the amplified signal with the original input and adjusts the output to minimize the error rate, enabling high gain operation without proportionally increasing errors.
Data Source
AI summary
A sample and hold circuit includes a sampling circuit including a first amplifier configured to amplify an input voltage to generate an amplification voltage, the sampling circuit configured to perform a sampling operation of sampling the amplification voltage. The sample and hold circuit also includes a holding circuit configured to perform a holding operation of setting an output voltage to a voltage level of the input voltage, based on the sampling operation and an amplification operation of a second amplifier.