Double-Spiral Dual-Balanced Mixer Layout for Compact MMW ICs
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Solution Overview
Problem
Conventional star-type dual-balanced mixer circuits are too large for miniaturized IC chip fabrication due to their dual-balun circuit architecture, making them unsuitable for compact IC implementations in millimeter wave communications systems.
Innovation Solution
A miniaturized dual-balanced mixer circuit is designed using a double spiral layout architecture for the balun circuit units on a multilayer substrate, reducing the layout space required for IC implementation to about 15% of the conventional star-type DBM, employing a dual Marchand balun circuit architecture with distributed transmission lines and a frequency-mixing circuit unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional star-type dual-balanced mixer circuit is used, then frequency mixing performance is maintained, but the layout area is excessively large for miniaturized IC implementation
Solution Approach 1:
The patent transitions from a planar star-type layout to a three-dimensional double spiral architecture utilizing multilayer substrates. The balun circuit units are arranged in a spiral pattern across multiple layers, with interlayer connections via vias, effectively using vertical dimension to reduce the horizontal layout area while preserving circuit functionality and frequency mixing performance
Solution Approach 2:
The patent employs a compact nested arrangement where the double spiral balun circuit units are tightly integrated within a confined footprint. The spiral structure allows transmission lines to be nested within themselves, and multiple circuit elements are nested within the spiral turns, maximizing space utilization and achieving miniaturization
2Adaptability or versatility
If the dual-balun circuit architecture is used, then balanced mixing functionality is achieved, but the circuit size becomes unsuitable for miniaturized IC chips
Solution Approach 1:
The patent uses multilayer substrate technology to arrange balun circuit units in three dimensions. The spiral layout wraps transmission lines around central points on each layer, with interlayer vias providing vertical connections, thereby reducing the horizontal footprint while maintaining the dual-balun architecture's balanced mixing functionality
Solution Approach 2:
The patent divides the dual-balun circuit into two separate balun circuit units, each implemented as an independent spiral structure. This segmentation allows each unit to be optimized for compactness while working together to achieve the required balanced mixing function, reducing overall circuit size compared to a monolithic implementation
Data Source
AI summary
A miniaturized dual-balanced mixer circuit based on a double spiral layout architecture is proposed, which is designed for use to provide a frequency mixing function for millimeter wave (MMW) signals, and which features a downsized circuit layout architecture that allows IC implementation to be more miniaturized than the conventional star-type dual-balanced mixer (DBM). The proposed miniaturized dual-balanced mixer circuit is distinguished from the conventional star-type DBM particularly in the use of a double spiral layout architecture for the layout of two balun circuit units. This feature allows the required layout area to be only about 15% of that of the conventional star-type DBM.