Balanced I/Q Transformer Receiver for Compact Low-Power RF Front Ends
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Solution Overview
Problem
Existing wireless communication receivers face challenges in minimizing size, cost, and power consumption while meeting stringent linearity and noise requirements, which are often addressed by complex circuits that increase these parameters.
Innovation Solution
A receiver design incorporating a balanced I/Q transformer with a single-ended low noise amplifier and differential mixers, which provides a balanced interface between the amplifier and mixers, reducing power consumption and size while maintaining performance by using a passive transformer and varactors for signal conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex circuits are used to meet linearity and noise requirements, then performance is improved, but size and cost increase
Solution Approach 1:
The patent combines the I/Q transformation function with the impedance matching network into a single integrated structure. The transformer serves dual purposes: it performs the balanced-to-unbalanced signal conversion required for I/Q demodulation while simultaneously providing impedance matching between the LNA and subsequent stages. This merging eliminates the need for separate I/Q transformers and matching networks, reducing the overall receiver size while maintaining performance requirements.
2Reliability
If complex circuits are used to meet linearity and noise requirements, then performance is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple functions into the transformer structure, eliminating the need for separate active circuits that would consume power. The passive transformer handles both I/Q transformation and impedance matching without requiring additional amplification or active components, thereby reducing overall power consumption while meeting linearity and noise performance requirements.
3Reliability
If complex circuits are used to meet linearity and noise requirements, then performance is improved, but device complexity increases
Solution Approach 1:
The patent integrates the I/Q transformation function with the impedance matching network into a single transformer structure. This merging reduces the total number of discrete components and interconnections required, simplifying the overall circuit architecture while maintaining the necessary performance characteristics for linearity and noise figure.
Solution Approach 2:
The transformer structure is designed to perform multiple functions simultaneously: it provides balanced-to-unbalanced signal conversion for I/Q demodulation, performs impedance matching between different circuit stages, and maintains signal integrity. This multi-functionality reduces the need for separate dedicated circuits, thereby reducing device complexity.
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 balanced I/Q transformer design achieves better amplitude and phase matching, improved isolation between signal branches, and reduced power consumption, resulting in a more efficient and compact receiver that meets stringent performance metrics.
Implementation Method 1
a first secondary coil magnetically coupled to the at least one primary coil and providing a first differential signal to a second circuit; a second secondary coil magnetically coupled to the at least one primary coil and providing a second differential signal to a third circuit
Data Source
AI summary
A receiver with a balanced I/Q transformer is described. In an exemplary design, the receiver includes an LNA that amplifies a received RF signal and provides a single-ended RF signal to the balanced I/Q transformer. The balanced I/Q transformer includes at least one primary coil and first and second secondary coils. The first secondary coil is magnetically coupled to the at least one primary coil and provides a first differential RF signal to a first mixer. The second secondary coil is magnetically coupled to the at least one primary coil and provides a second differential RF signal to a second mixer. The first and second mixers downconvert the first and second differential RF signals with I and Q LO signals, respectively, and provide differential I and Q downconverted signals. The primary and secondary coils may be fabricated on two conductive layers of an integrated circuit.