Transformer Power Combiner With Overlapped Coil Sections for Low-Loss Output
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Solution Overview
Problem
Conventional power combiners in low power integrated circuits face challenges in efficiently combining multiple amplifier outputs to generate high power signals without increasing area and signal loss, particularly at millimeter wave frequencies using nanometer technology.
Innovation Solution
A power combiner design that utilizes primary coils with coupling and non-coupling parts, where the non-coupling parts are overlapped to cancel current and inductively couple to a secondary coil, minimizing power loss and optimizing semiconductor space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power amplifiers are configured to drive a delay line spaced at wavelength/2, then power combination is achieved, but area and routing loss increase
Solution Approach 1:
The patent transitions from spatial routing (wavelength/2 delay lines requiring large chip area) to electromagnetic coupling (transformer-based inductive coupling) to combine power amplifier outputs. This dimensional change from physical routing to field-based coupling dramatically reduces the required chip area while maintaining power combination functionality.
2Reliability
If secondary winding length is increased by a factor of two to achieve adjacent pair decoupling and impedance transformation, then impedance matching is improved, but power loss doubles
Solution Approach 1:
The patent modifies the transformer structure by introducing a tertiary winding and adjusting the coupling coefficients between windings. This parameter change allows achieving both impedance transformation and adjacent pair decoupling without requiring excessive secondary winding length, thereby reducing power loss while maintaining impedance matching.
3Power
If differential termination of opposite phase driven devices is implemented, then power combination efficiency is improved, but signal loss increases in the presence of output mismatch
Solution Approach 1:
The patent introduces a tertiary winding as an intermediary element that mediates between the primary and secondary windings. This intermediary provides an additional degree of freedom to simultaneously achieve differential termination for efficient power combination while minimizing signal loss through optimized coupling, even in the presence of output mismatch.
4Power
If conventional power combiner techniques are used to generate high power signals, then desired output power is achieved, but area efficiency and loss reduction are not optimized
Solution Approach 1:
The patent employs a composite transformer structure combining primary, secondary, and tertiary windings with optimized coupling coefficients. This composite structure integrates multiple functions (power combination, impedance transformation, adjacent pair decoupling) into a single compact element, achieving high output power with reduced losses compared to conventional separate components.
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 design achieves efficient power combination with reduced loss and area utilization, enabling high power signal generation at low voltages for applications like radar and communication systems.
Implementation Method 1
the coupling part of every primary coil in the plurality of primary coils is inductively coupled to the secondary coil
Data Source
AI summary
According to an aspect, method of combining a plurality of powers in an integrated circuit comprising receiving the plurality of powers on corresponding a plurality of primary coils, wherein each primary coil in the plurality of primary coils comprising a coupling part and a non-coupling part, coupling the plurality of powers to a secondary coil through only the coupling part, wherein the coupling part of every primary coil in the plurality of primary coils is inductively coupled to the secondary coil and nullifying power in the non-coupling part of a primary coils in the plurality of primary coil.