Differential-to-Single-Ended Balun Without Switch Losses
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Solution Overview
Problem
Existing balun transformers and PA/LNA systems suffer from significant losses and inefficiencies due to the use of switches and quarter wavelength transmission lines, leading to degraded gain and power efficiency, as well as noise introduction.
Innovation Solution
A low loss balun system is introduced, utilizing electromagnetically coupled windings without series or shunt switches, which converts differential signals to single-ended signals and vice versa, improving performance by approximately 1.5 dB in loss reduction and 25-30% in power supply current reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switches are used in existing balun transformers and PA/LNA systems, then signal routing and switching functionality are achieved, but significant losses and inefficiencies occur due to switch-induced losses
Solution Approach 1:
The patent removes switches entirely from the balun circuit by extracting the switching functionality and replacing it with a continuous electromagnetic coupling mechanism using transformer windings. This eliminates switch-induced losses while maintaining the ability to route signals between differential and single-ended configurations through the transformer's inherent coupling properties rather than active switching components.
Solution Approach 2:
The patent replaces the mechanical/electronic switching system with an electromagnetic field-based system. Instead of using switches that mechanically or electronically open/close circuits, the invention uses electromagnetic coupling through transformer windings to achieve signal routing and balancing, substituting a lossy mechanical switching mechanism with a more efficient electromagnetic field interaction.
2Power
If quarter wavelength transmission lines are used in existing balun systems, then impedance matching and signal conversion are achieved, but gain is degraded and power efficiency is reduced
Solution Approach 1:
The patent merges the functions of impedance matching, signal conversion, and balancing into a single transformer structure. Instead of using separate quarter wavelength transmission lines for each function, the invention combines these capabilities into the electromagnetic coupling mechanism of the transformer windings, reducing the number of discrete components while improving power efficiency by eliminating multiple interfaces and transitions.
Solution Approach 2:
The transformer structure in the patent serves multiple functions simultaneously: it provides impedance matching between different stages, converts between differential and single-ended signals, and maintains balancing throughout the circuit. This multi-functional approach eliminates the need for dedicated quarter wavelength transmission lines for each specific function, reducing overall device complexity and improving power efficiency.
3Reliability
If switches are interposed between windings and antenna, then signal routing control is achieved, but noise is introduced and gain is degraded
Solution Approach 1:
The patent extracts and removes the switching network from the signal path between the transformer windings and the antenna. By eliminating switches entirely, the invention prevents noise introduction and gain degradation that would otherwise occur at switching points, while maintaining signal routing control through the continuous electromagnetic coupling of the transformer structure.
Solution Approach 2:
The invention maintains continuous electromagnetic coupling between all circuit elements without interruption from switching actions. The transformer windings provide continuous signal transmission paths that avoid the discontinuities and noise bursts associated with switch operation, ensuring uninterrupted and clean signal flow from the antenna through the balun to the amplifier stages.
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 low loss balun system provides improved gain and power efficiency by eliminating switch-induced losses, resulting in enhanced signal transmission and reception capabilities.
Implementation Method 1
a second winding electromagnetically coupled to the first winding and coupled between the reference node and the amplifier
Data Source
AI summary
A system including a low loss balun is presented, the system including an amplifier; an antenna; a reference node; a first winding coupled between the antenna and the amplifier; and a second winding electromagnetically coupled to the first winding and coupled between the reference node and the amplifier.