Transformer-Based IQ Amplifier for Compact Wideband Image Rejection
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Solution Overview
Problem
Conventional mm-Wave communication devices face challenges with large size and power consumption due to the use of multiple inductive structures and high-order RC-CR Poly-Phase Filters, which result in signal attenuation and increased reconfiguration latency, making it difficult to achieve wideband image rejection and high current gain.
Innovation Solution
A transformer-based current-reused IQ amplifier architecture is introduced, which integrates inductive loads and amplifiers to reduce size and power consumption, using a differential balun and cascode amplifier design to enhance current gain and bandwidth while eliminating DC current flow and the need for capacitors, thereby achieving an ultra-compact wideband image-rejection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple inductive structures and high-order RC-CR Poly-Phase Filters are used to achieve wideband image rejection and high current gain, then signal quality and bandwidth are improved, but device area and power consumption increase
Solution Approach 1:
The patent combines the amplifier and IQ generator into a single integrated structure where the transformer serves dual purposes: as the load for the amplifier and as the IQ generation network. This merging eliminates the need for separate inductive structures and RC-CR Poly-Phase Filters, achieving wideband image rejection while reducing device area.
Solution Approach 2:
The transformer in the patent performs multiple functions simultaneously: it acts as the amplifier load, generates IQ signals, and provides the necessary phase shifting. This multi-functionality replaces what would traditionally require multiple separate components, thereby reducing the overall device area while maintaining image rejection performance.
2Reliability
If multiple inductive structures and high-order RC-CR Poly-Phase Filters are used to achieve wideband image rejection and high current gain, then signal quality and bandwidth are improved, but power consumption increases
Solution Approach 1:
The patent combines the amplifier and IQ generator into a single integrated structure where the transformer serves dual purposes: as the amplifier load and as the IQ generation network. This merging eliminates the need for separate inductive structures and RC-CR Poly-Phase Filters, achieving wideband image rejection while reducing device area.
Solution Approach 2:
The patent eliminates the need for separate RC-CR Poly-Phase Filters and their associated power consumption by recovering the IQ generation function within the transformer-based amplifier structure. The same inductive elements that provide amplification also generate the quadrature signals, discarding the need for additional filter circuits and their power requirements.
3Adaptability or versatility
If RC-CR Poly-Phase Filters are used to generate wideband IQ signals, then IQ signal generation is achieved, but signal attenuation increases and LO power requirements increase
Solution Approach 1:
The patent replaces the RC-CR Poly-Phase Filter (a passive filter-based system) with an active transformer-based IQ generation approach. The transformer uses magnetic coupling and turns ratios to generate quadrature signals, substituting the filter-based mechanism with a transformer-based mechanism that has lower signal attenuation and does not require additional LO power to compensate for losses.
4Speed
If inductive loadings are used to extend active device operation bandwidth with higher current gain, then bandwidth and current gain are improved, but device area and integration difficulty increase
Solution Approach 1:
The patent combines the amplifier and IQ generator into a single integrated structure where the transformer serves dual purposes: as the amplifier load and as the IQ generation network. This merging eliminates the need for separate inductive structures and RC-CR Poly-Phase Filters, achieving wideband image rejection while reducing device area.
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 solution enables a compact and efficient wideband image-rejection system that supports next-generation 5G communication devices with high capacity requirements, reducing size and power consumption while maintaining high current gain and signal quality.
Implementation Method 1
A differential transformer-based IQ generator circuit with an integrated amplifier can be used to generate differential in-phase (I) and quadrature (Q) phase output signals based on a single-ended input signal
Data Source
AI summary
According to one embodiment, a transformer-based in-phase and quadrature (IQ) includes a differential balun having a first inductor and a second inductor. The first inductor has a first input terminal and a first output terminal. The second inductor has a second input terminal and a second output terminal. Additionally, the IQ generator circuit includes a third inductor magnetically coupled with the first inductor. The third inductor has a first isolation terminal and a third output terminal. The IQ generator circuit also includes a fourth inductor magnetically coupled with the second inductor. The fourth inductor has a second isolation terminal and a fourth output terminal. The IQ generator circuit additionally includes a first transistor coupled to the first input terminal of the first inductor. Further, the generator circuit includes a second transistor coupled to the second input terminal of the second inductor. The first transistor, the second transistor, the first inductor, and the second inductor form a part of a differential amplifier.