Configurable Amplifier Circuitry With Closed-Loop Feedback Paths
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Solution Overview
Problem
Existing amplifier circuitry configurations face challenges in flexibility and stability, particularly when transitioning between single-ended and differential amplifier modes, leading to potential instability due to open-loop configurations.
Innovation Solution
The integration of configurable amplifier circuitry with shunt resistors and return path switches allows for seamless reconfiguration between single-ended and differential amplifier operations, ensuring closed-loop feedback paths are maintained regardless of external connections, thereby stabilizing the circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If amplifier circuitry is reconfigured between single-ended and differential modes using external connections, then operational versatility is improved, but circuit stability deteriorates due to potential open-loop configurations
Solution Approach 1:
The patent applies feedback by providing dedicated shunt resistors with external terminals that enable feedback paths to be maintained in both single-ended and differential amplifier configurations. The shunt resistors are coupled to feedback inputs of the input stages, ensuring that feedback signals can be properly routed regardless of the operational mode, thus preventing open-loop conditions and maintaining circuit stability while allowing configuration flexibility.
Solution Approach 2:
The patent implements universality by designing the shunt resistors to serve multiple functions: they provide feedback path termination in single-ended mode, enable differential mode operation, and maintain stable feedback paths across both configurations. The dedicated external terminals allow the same physical components to adapt to different operational requirements, ensuring versatile functionality without sacrificing stability.
2Reliability
If dedicated shunt resistors with external terminals are provided for feedback paths, then circuit stability is improved by maintaining closed-loop feedback, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the shunt resistors directly into the amplifier circuitry on the same integrated circuit device, rather than using separate external components. The shunt resistors are combined with the feedback path infrastructure, sharing common terminals and circuit nodes. This integration reduces overall device complexity while maintaining the stability benefits of dedicated feedback paths.
Data Source
AI summary
Integrated circuitry implementing amplifier circuitry, the integrated circuitry comprising first amplifier circuitry and second amplifier circuitry, the first and second amplifier circuitry being configurable as first and second single-ended amplifiers or as a differential amplifier, wherein the first amplifier circuitry comprises: a first input stage; a first half-bridge output stage having an output coupled to a first output terminal of the integrated circuitry; a first feedback path coupling a first input of the first input stage to a first sense terminal of the first amplifier circuitry; a second feedback path coupling a second input of the first input stage to a second sense terminal of the first amplifier circuitry; and a first shunt resistor coupling the output of the first half-bridge output stage to the first feedback path, wherein the second amplifier circuitry comprises: a second input stage; and a second half-bridge output stage having an output coupled to a second output terminal of the integrated circuitry, and wherein the first amplifier circuitry further comprises a second shunt resistor coupling the second feedback path to a dedicated shunt resistor terminal of the integrated circuitry, such that the second shunt resistor is directly accessible from outside the integrated circuitry.