Virtual Earth Node Voltage Regulation for Single-Ended Signal Processing
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Solution Overview
Problem
Differential signal processing circuits face challenges when handling single-ended input signals, as they require large and power-hungry components to cope with significant common-mode voltage variations, leading to increased size and power consumption, especially in portable devices.
Innovation Solution
A signal processing circuit with virtual earth nodes and a regulator that monitors and maintains the voltage at one node against a reference, applying regulation signals to both nodes to minimize voltage differences, effectively converting single-ended signals into fully differential signals without the need for high-quality initial amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a differential signal processing circuit is used to handle single-ended input signals, then the circuit can process both fully differential and single-ended signals with good performance, but the components must be able to cope with large common-mode voltage variations which increases the size and power requirements
Solution Approach 1:
The patent changes the operating parameters of the virtual earth nodes by introducing a regulator that actively controls their voltage levels. The regulator adjusts the common-mode voltage parameter to remain substantially constant, allowing the circuit to handle single-ended signals without requiring components designed for large voltage swings, thus reducing power consumption while maintaining versatility
Solution Approach 2:
The patent implements a feedback mechanism through the regulator that continuously monitors the voltage at the virtual earth nodes and adjusts the feedback signal accordingly. This feedback loop ensures that the common-mode voltage remains stable despite single-ended input variations, enabling the circuit to maintain good performance with reduced component size and power requirements
2Adaptability or versatility
If components are sized to cope with large common-mode voltage variations, then the circuit can handle single-ended signals, but the circuit size increases
Solution Approach 1:
The regulator actively controls the voltage parameter at the virtual earth nodes, maintaining it at a substantially constant level. This parameter change allows the use of smaller components that are optimized for stable voltage operation rather than large voltage swings, thereby reducing circuit area while preserving the ability to process both single-ended and fully differential signals
Solution Approach 2:
The patent creates an equipotential condition at the virtual earth nodes by using the regulator to maintain substantially equal and constant voltages. This equipotential approach eliminates the need for oversized components that would be required to handle voltage variations, thus reducing circuit size while maintaining signal processing versatility
3Adaptability or versatility
If components are sized to cope with large common-mode voltage variations, then the circuit can handle single-ended signals, but the power requirements increase
Solution Approach 1:
The regulator maintains the voltage parameter at the virtual earth nodes at a constant level, preventing large common-mode voltage variations. This allows the use of components with lower power requirements that are optimized for stable operating conditions, thereby reducing overall power consumption while maintaining the circuit's ability to process both single-ended and fully differential signals with good performance
4Adaptability or versatility
If one input is left floating or held at constant DC voltage, then single-ended signal processing is enabled, but large variation in common mode voltage occurs
Solution Approach 1:
The patent employs a feedback mechanism where the regulator monitors the voltage at the virtual earth nodes and adjusts the feedback signal to maintain substantially equal and constant voltages. This feedback control stabilizes the common-mode voltage even when one input is left floating or held at constant DC voltage, enabling single-ended signal processing while preventing large voltage variations
Solution Approach 2:
The regulator enforces equipotentiality at the virtual earth nodes by actively controlling their voltages to remain substantially equal and constant. This equipotential condition stabilizes the common-mode voltage despite single-ended input configurations, allowing input flexibility while maintaining voltage stability through the regulator's control action
Data Source
AI summary
This application relates to methods and apparatus for voltage regulation. Embodiments relate to signal processing circuit (300) having a first and second processing path with respective first and second inputs (INP and INN). The first and second processing paths have respective first and second virtual earth nodes (108P and 108N) at the input to a differential integrator (106). A differential feedback path is configured to apply a feedback signal to each of the first and second virtual earth nodes so as to minimize any voltage difference between them. A regulator (301) is operable to monitor a voltage at one of the virtual earth nodes (108P) against a reference voltage (VREF) and to generate a regulation signal to maintain the voltage at said monitored one of the first and second virtual earth nodes to be equal to the reference voltage. The regulation signal is applied to both of the first and second virtual earth nodes.