Analog-to-digital converter combined instrument amplifier

By combining an analog-to-digital converter with an instrumentation amplifier, utilizing an unbalanced input to balanced differential circuit and a high-precision Σ-Δ single-supply digital-to-analog converter, the common-mode rejection ratio is optimized, and efficient signal processing is constructed. This solves the problems of signal quality and signal transmission and anti-interference in production and processing in existing technologies, realizes high-quality signal processing across the entire chain, adapts to diverse scenario requirements, and improves system integration and compatibility.

CN121173237APending Publication Date: 2025-12-19SHENZHEN TONGCHUANG AUDIO TECH CO LTD
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Patent Information

Application Number
CN202511140295.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-14
Publication Date
2025-12-19

AI Technical Summary

Technical Problem

Existing instrumentation amplifier circuits are complex and costly, making it difficult to effectively suppress common-mode noise interference, which affects signal quality and production processes, and is also difficult to meet the needs of diverse industrial and measurement and control scenarios.

Method used

An analog-to-digital converter combined instrumentation amplifier is used, which uses an unbalanced input to balanced differential circuit output module and a high-precision Σ-⊿ single-supply digital-to-analog converter. By optimizing the common-mode rejection ratio with resistor parameters, a high input impedance and low noise front end is constructed to achieve differential signal transmission and common-mode interference reduction.

Benefits of technology

It achieves high-quality signal processing across the entire chain, improves signal purity and anti-interference capabilities, reduces production costs and complexity, adapts to diverse scenario requirements, and enhances system integration and compatibility.

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Abstract

The invention relates to the technical field of amplifiers, and discloses an analog-to-digital converter combination instrument amplifier which comprises a first-stage amplifier, the first-stage amplifier is in signal connection with a second-stage amplifier, the second-stage amplifier is in signal connection with a front-end low-pass filter (LPF), the front-end low-pass filter (LPF) is in signal connection with an analog-to-digital converter (ADC), and the analog-to-digital converter (ADC) is in signal connection with the analog-to-digital converter. And an unbalanced input-to-balanced differential circuit output module is arranged between the second-stage amplifier signal and a front-end low-pass filter (LPF). From the perspective of signal processing and conversion, a precise signal transition bridge is constructed by adding an unbalanced input-to-balanced differential circuit output module, unbalanced signals output by a second-stage amplifier are converted into double-end balanced differential signals, common-mode noise interference is effectively resisted through a differential transmission mode, the signal purity is guaranteed, and the signal quality is improved. The front-end low-pass filter and the analog-to-digital converter are adaptive to differential signals, so that the signal transmission is stable and anti-interference, and the analog-to-digital conversion is more accurate.
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