Wireless Receiver Bypass Filtering for High Linearity Mixing
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Solution Overview
Problem
Receiver non-linearity results in signal distortion due to current leakage by transistors and charge injection, necessitating a high linearity wireless receiver design.
Innovation Solution
A wireless receiver architecture incorporating an out-band signal bypass filter, a mixer, and a baseband circuit, where the out-band signal bypass filter provides a path to suppress out-band signals, improving linearity by coupling the mixer with filtered signals and generating in-phase and quadrature phase signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional receiver architecture is used, then device complexity is low, but linearity is poor due to transistor current leakage and charge injection
Solution Approach 1:
The receiver signal path is segmented into multiple functional blocks: out-band signal attenuation filter, out-band signal bypass filter, mixer, and baseband circuit. This segmentation allows each block to be optimized for its specific function, with the bypass filter handling out-band signals separately to improve linearity without affecting the entire receiver architecture.
Solution Approach 2:
An out-band signal bypass filter is introduced as an intermediary component between the attenuator and mixer. This bypass filter provides a dedicated path for out-band signals, preventing them from causing distortion in the main signal path while maintaining low device complexity through targeted intervention rather than complete architectural redesign.
2Object-affected harmful factors
If out-band signals are not suppressed, then device complexity is low, but signal distortion increases due to receiver non-linearity
Solution Approach 1:
Out-band signals are suppressed in advance before they can cause distortion in the mixer and baseband circuit. The out-band signal bypass filter is positioned early in the signal path to preemptively remove harmful out-band signals, preventing rather than correcting distortion.
Solution Approach 2:
Harmful out-band signals are extracted and removed from the main signal path using the bypass filter. This selective extraction eliminates the source of distortion without affecting the processing of desired in-band signals, addressing the harmful factor directly rather than through general system complexity.
Data Source
AI summary
A wireless receiver with high linearity, having an out-band signal bypass filter, a mixer, and a baseband circuit. The out-band signal bypass filter has a first terminal and a second terminal respectively receiving a positive differential signal and a negative differential signal from a former-stage circuit, and the out-band signal bypass filter provides an out-band signal bypass path from the first terminal to the second terminal. The mixer receives a filtered signal from the out-band signal bypass filter. The baseband circuit is coupled to the mixer for generation of an in-phase signal and a quadrature phase signal.