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 need for multiple inductive structures and high-order RC-CR Poly-Phase Filters, which result in signal attenuation and increased reconfiguration latency, especially in achieving 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 achieve ultra-compact wideband image-rejection systems for next-generation 5G communication devices.
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 the image rejection performance and current gain are improved, but the device area and power consumption increase
Solution Approach 1:
The patent combines the IQ generator and amplifier into a single integrated circuit block, merging multiple previously separate inductive structures and filter components into one unified device. This integration achieves wideband image rejection and high current gain while reducing the overall device area by eliminating the need for multiple separate inductive structures and high-order RC-CR Poly-Phase Filters
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 the image rejection performance and current gain are improved, but the power consumption increases
Solution Approach 1:
The patent combines the IQ generator and amplifier into a single integrated circuit block, merging multiple previously separate inductive structures and filter components into one unified device. This integration achieves wideband image rejection and high current gain while reducing the overall power consumption by eliminating redundant components and optimizing the shared inductive structures
3Speed
If high-order RC-CR Poly-Phase Filters are used to create wideband IQ signals, then the bandwidth is extended, but the signal attenuation increases and LO power consumption increases
Solution Approach 1:
The patent replaces the traditional high-order RC-CR Poly-Phase Filter mechanism with an integrated transformer-based IQ generator that uses inductive coupling and magnetic field transformation. This substitution maintains wideband operation while reducing signal attenuation and LO power consumption by using a different physical mechanism (electromagnetic induction) instead of resistive-capacitive filtering
4Reliability
If extensive open-loop calibrations are performed to ensure sufficient signal-to-noise ratio and image rejection ratio, then the signal quality is improved, but the reconfiguration latency and system complexity increase
Solution Approach 1:
The patent implements self-calibration mechanisms within the integrated IQ generator-amplifier circuit that automatically adjust for signal-to-noise ratio and image rejection ratio without requiring extensive external open-loop calibrations. This self-service approach maintains high signal quality while dramatically reducing reconfiguration latency and system complexity by eliminating manual calibration procedures
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
This solution enables compact and efficient wideband image-rejection systems with reduced power consumption and latency, supporting high-capacity 5G communication requirements by co-designing IQ generators and amplifiers, thereby enhancing current gain and bandwidth while minimizing DC power usage.
Implementation Method 1
a first inductor (604) and a second inductor (606). The first inductor has a first input terminal (608) and a first output terminal (610). The second inductor has a second input terminal (612) and a second output terminal (614). The IQ generator circuit includes a third inductor (616) magnetically coupled with the first inductor (604)
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.