Inductive IQ Passive Mixer Topology for Higher Conversion Gain
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Solution Overview
Problem
Existing IQ passive mixers face challenges in achieving high conversion gain, which is essential for efficient radiofrequency signal down-conversion.
Innovation Solution
The proposed IQ mixer incorporates a mixing stage with two inductive blocks and a specific configuration of MOS transistors, along with inductive components and capacitors, to enhance conversion gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional resistive mixers are used, then the device complexity is low, but the conversion gain is insufficient
Solution Approach 1:
The patent changes the load impedance parameter from resistive to inductive by introducing inductive blocks at the baseband outputs. This parameter change transforms the mixer from a resistive configuration with low conversion gain to an inductive configuration with enhanced conversion gain, directly resolving the technical contradiction between conversion gain and device complexity
Solution Approach 2:
The patent introduces inductive blocks as intermediary elements between the mixing stage and the baseband outputs. These inductive blocks act as mediators that couple the mixing stage to the baseband, providing the necessary inductive loading to enhance conversion gain without requiring complete redesign of the entire mixer architecture
2Power
If inductive blocks are added to enhance conversion gain, then the conversion gain improves, but the device complexity increases
Solution Approach 1:
The patent segments the mixer architecture by separating the mixing stage from the baseband output stage, with inductive blocks serving as intermediate coupling elements. This segmentation allows the inductive blocks to be added as distinct functional modules, making the complexity increase manageable and modular rather than requiring complete architectural redesign
Solution Approach 2:
The inductive blocks serve multiple functions: they provide inductive loading to enhance conversion gain, couple the mixing stage to baseband, and can be integrated with existing transistor structures. This multi-functionality reduces the overall complexity increase by having single components perform multiple roles
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 enhanced configuration results in superior conversion gain compared to traditional resistive mixers, effectively down-converting radiofrequency signals with minimal harmonic interference.
Implementation Method 1
a first inductive block coupled to the first mixer and comprising at least a first inductive component and a second inductive block coupled to the second mixer and comprising at least a second inductive component
Implementation Method 2
The first inductive block further comprises a first capacitor connected between the second terminal and the fourth terminal
Data Source
AI summary
An IQ mixer includes a mixing stage with a first mixer and a second mixer. A first inductive block is coupled to the first mixer and includes at least a first inductive component. A second inductive block is coupled to the second mixer and includes at least a second inductive component.