Differential-to-Single-Ended Buffer With Swing Suppression Resistor
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Solution Overview
Problem
Differential to single-ended buffer amplifiers face significant signal swing issues at the non-inverting input terminal, degrading linearity due to common-mode noise and signal vibrations, which existing architectures fail to adequately address without compromising signal integrity.
Innovation Solution
Incorporation of a swing suppression resistor between the negative input terminal and the non-inverting input terminal of the differential to single-ended operational amplifier, along with strategically placed resistors to manage signal gain and common-mode noise, ensures suppression of signal swing and common-mode noise, thereby enhancing linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a differential to single-ended operational amplifier is used without a common-mode feedback circuit, then the device complexity is reduced, but the linearity is degraded due to significant signal swing at the non-inverting input terminal
Solution Approach 1:
A swing suppression resistor is introduced as an intermediary element connected between the non-inverting input terminal and a reference potential. This resistor acts as a mediator to dampen the signal swing at the non-inverting input terminal, thereby improving linearity without requiring a complex common-mode feedback circuit. The resistor value is specifically chosen to suppress the swing while maintaining signal integrity.
2Manufacturing precision
If a fully differential operational amplifier with common-mode feedback circuit is used, then the linearity is improved by suppressing common-mode noise, but the device complexity increases
Solution Approach 1:
The invention extracts and addresses only the critical aspect of common-mode noise suppression by introducing a simple swing suppression resistor at the non-inverting input terminal, rather than implementing a complete common-mode feedback circuit. This selective approach removes the unnecessary complexity of full CMFB while retaining the essential linearity improvement.
3Manufacturing precision
If the resistance of the swing suppression resistor is increased, then the signal swing suppression is improved, but the signal attenuation increases
Solution Approach 1:
The invention optimizes the resistance value of the swing suppression resistor to achieve the best compromise between signal swing suppression and signal attenuation. By carefully selecting the resistor parameter, the circuit effectively reduces the non-inverting input terminal swing while maintaining adequate signal transmission. The optimal resistance value depends on the specific application requirements and operating conditions.
Data Source
AI summary
A differential to single-ended buffer amplifier with a swing suppression resistor in the differential amplification architecture is shown. The differential to single-ended buffer amplifier has a positive input terminal, a negative input terminal, a differential to single-ended operational amplifier (DISO op amp), and a swing suppression resistor. The DISO op amp has a non-inverting input terminal and an inverting input terminal respectively coupled to the positive input terminal and the negative input terminal, and it has a single-ended output terminal that outputs the output signal of the differential to single-ended buffer amplifier. The swing suppression resistor is connected between the negative input terminal of the differential to single-ended buffer amplifier and the non-inverting input terminal of the DISO op amp.