Class-B Baseband Buffer for Common-Mode Rejection
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Solution Overview
Problem
Current radio frequency processing devices face inefficiencies in signal processing, particularly in removing common-mode components and addressing spatial mismatches, which affect power consumption and signal quality.
Innovation Solution
The implementation of a class-B signal buffer that amplifies and filters differential current-mode signals without operational amplifiers, and techniques for reducing spatial mismatches through parallel processing circuitry and switching circuitry to alternate between processing paths, enabling efficient up-conversion and power amplification while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If operational amplifiers are used in signal buffering, then signal amplification is achieved, but power consumption increases and current efficiency decreases
Solution Approach 1:
The patent extracts and removes the operational amplifier from the signal buffering circuitry, replacing it with a class-B signal buffer that uses transistors configured in a push-pull arrangement. This extraction eliminates the high power consumption associated with operational amplifiers while maintaining signal amplification capability through the alternative class-B buffering approach.
Solution Approach 2:
The patent changes the operating parameters of the signal buffer by transitioning from operational amplifier-based buffering to class-B buffering with specific transistor configurations. This parameter change includes setting the transistors to operate in class-B mode with appropriate biasing, which reduces quiescent current consumption while maintaining signal amplification when needed.
2Device complexity
If common-mode components are not removed, then circuit simplicity is maintained, but signal quality deteriorates due to spatial mismatches
Solution Approach 1:
The patent introduces a common-mode rejection mechanism as an intermediary element in the differential signal path. The class-B signal buffer is configured with transistors that inherently provide common-mode rejection, acting as a mediator that eliminates spatial mismatches and common-mode components without requiring additional complex circuitry. This intermediary function is built into the transistor configuration itself.
3Use of energy by moving object
If class-B signal buffer is implemented without operational amplifiers, then power consumption is reduced, but signal processing capability must be maintained
Solution Approach 1:
The class-B signal buffer is designed to be self-serving, where the transistor pair automatically provides signal amplification when differential signals are present without requiring continuous power from an operational amplifier. The buffer draws power only when needed for signal processing, and the transistor configuration self-regulates to maintain signal amplification capability while minimizing quiescent power consumption.
Data Source
AI summary
A buffer circuit includes a first feedback buffer to receive a first component of a current-mode signal and a second feedback buffer to receive a second component of the current-mode signal. The buffer circuit also including a first inverter having a first input coupled to an output of the second feedback buffer and to an input of a first current circuit through a first filter, a first output coupled to an input of the first feedback buffer. The buffer circuit also includes a second inverter having a second input coupled to an output of the first feedback buffer and to an input of a second current circuit through a second filter, and a second output coupled to an input of the second feedback buffer.