Two-Stage Transimpedance Amplifier Noise Compensation Circuit
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Solution Overview
Problem
Two-stage transimpedance amplifier devices suffer from noise component superposition due to the need for reference signals at both amplifier stages, which affects the overall amplification characteristics.
Innovation Solution
The transimpedance amplifier device minimizes noise by connecting the two amplifier components in a way that a reference signal with noise components from one amplifier stage is supplied to the other, allowing for noise compensation through suitable interconnection, potentially using a shared integrated circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signals are supplied at both amplifier stages, then the amplifiers can operate properly, but noise components superpose and degrade the overall noise performance
Solution Approach 1:
The patent applies this principle by taking the harmful noise components from the first amplifier's reference signal and converting them into a beneficial element. The reference signal from the first amplifier is supplied to the second amplifier's second input connection, where its noise component corresponds to and cancels out noise in the overall system. This transforms the previously harmful noise into a useful noise-cancellation mechanism, resolving the contradiction between maintaining proper amplifier operation and minimizing noise.
2Power
If a two-stage amplifier configuration is used, then the amplification capability is improved, but the complexity of noise management increases
Solution Approach 1:
The patent merges the reference signal generation and distribution functions into a unified approach. The first amplifier's reference signal is directly connected to the second amplifier's second input connection, creating an integrated noise-management system. This merging eliminates the need for separate noise-management circuits for each amplifier stage, reducing overall system complexity while maintaining the benefits of two-stage amplification.
3Ease of manufacture
If separate reference signals are used for each amplifier, then each amplifier can be optimized independently, but the overall noise performance deteriorates due to noise superposition
Solution Approach 1:
The patent makes the first amplifier's reference signal serve multiple functions simultaneously. It acts as the reference signal for the first amplifier and also serves as the reference signal for the second amplifier. This multi-functional use of the same signal source eliminates noise superposition while maintaining the ability to optimize each amplifier stage independently, as the shared reference signal ensures coherent noise cancellation across both stages.
Data Source
AI summary
A two-stage transimpedance amplifier device having a transimpedance amplifier and a post-connected voltage differential amplifier. One of the two amplifiers receives a signal from the respective other amplifier as a reference signal. In this way, a noise compensation is able to be achieved.