Balun With Intermediate Grounding For Wideband Signal Conversion
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Solution Overview
Problem
Existing baluns cannot effectively cover a wide operating frequency band, leading to increased area usage when configuring baluns for smaller frequency bands to improve signal-to-interference ratio (SIR).
Innovation Solution
A balun design incorporating a first coil, a second coil, a third coil, a fourth coil, and a capacitor, with specific inductive couplings and intermediate grounding architecture, enabling signal conversion from unbalanced to balanced across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple baluns are configured for respective small frequency bands, then the signal-to-interference ratio (SIR) is improved, but the area occupied in the wafer increases significantly
Solution Approach 1:
The patent combines multiple balun functions into a single integrated balun structure that can handle wide operating frequency bands. The merged structure uses shared components (coils, capacitors, grounding points) to achieve the functionality of multiple frequency-specific baluns without requiring separate physical spaces for each balun, thereby reducing total wafer area while maintaining SIR performance.
Solution Approach 2:
The invention creates a universal balun design that can operate across wide frequency bands by using adjustable coupling coefficients and intermediate grounding architecture. This multi-functional balun can adapt to different frequency requirements within its operating band, eliminating the need for multiple specialized baluns and reducing the overall area occupied on the wafer.
2Area of stationary object
If a single balun is used for wide operating frequency band, then the wafer area is reduced, but the signal-to-interference ratio (SIR) performance deteriorates
Solution Approach 1:
The patent introduces an intermediate grounding point as a mediator in the balun structure. This intermediate ground connection, combined with specifically designed coil couplings, acts as a signal reference point that improves the common mode rejection ratio and signal-to-interference ratio. The intermediary grounding structure enables the single balun to maintain high SIR performance across wide frequency bands by providing stable reference potentials and improving signal symmetry.
3Device complexity
If traditional balun structure is used, then the design is simple, but the common mode rejection ratio (CMRR) performance is insufficient
Solution Approach 1:
The patent segments the traditional balun structure by introducing an intermediate grounding point that divides the signal path into distinct sections. This segmentation creates separate current return paths and allows independent optimization of different signal components, thereby improving common mode rejection. The segmented architecture maintains reasonable design complexity while significantly enhancing CMRR performance through improved signal symmetry and reduced common mode currents.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed balun solution allows for efficient signal conversion across a wide operating frequency band, achieving better common mode rejection ratio (CMRR) performance compared to baluns without intermediate grounding architecture.
Implementation Method 1
the third coil is coupled between a first balanced terminal and a connection point, and the third coil is inductively coupled to the first coil. The fourth coil is coupled between the connection point and a second balanced terminal, and the fourth coil is inductively coupled to the second coil
Implementation Method 2
The capacitor is coupled between the connection point and a third ground terminal
Data Source
AI summary
A balun includes a first coil, a second coil, a third coil, a fourth coil, and a capacitor. The first coil is coupled between an unbalanced pin and a first ground terminal. The second coil is coupled between the first ground terminal and a second ground terminal. The third coil is coupled between a first balanced pin and a connection point and is inductively coupled to the first coil. The fourth coil is coupled between the connection point and a second balanced pin and is inductively coupled to the second coil. The capacitor is coupled between the connection point and a third ground terminal.