3D Double-Spiral Dual-Balanced Mixer for Compact IC Layouts
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Solution Overview
Problem
Conventional star-type dual-balanced mixer circuits are too large for miniaturized IC implementation due to their dual-balun architecture, making them unsuitable for compact IC chip fabrication.
Innovation Solution
A miniaturized dual-balanced mixer circuit utilizing a multilayer double spiral layout architecture with two balun circuit units arranged in a dual Marchand balun circuit architecture, featuring broadside inductive coupling and a 3-dimensional double-spiral circuit layout, reducing the required layout space to about 15% of conventional designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional star-type dual-balanced mixer circuit is used, then frequency mixing function is achieved, but the layout area is too large for miniaturized IC implementation
Solution Approach 1:
The patent transitions from a planar 2D layout to a 3D multilayer architecture. The dual Marchand balun circuit is implemented across multiple layers with vertical interconnections, allowing the circuit to utilize the third dimension (height/depth) to reduce the footprint area while maintaining all necessary electrical connections and signal paths for frequency mixing functionality.
Solution Approach 2:
The patent employs a compact nested arrangement where transmission lines and circuit elements are tightly integrated and positioned in close proximity. The spiral-shaped transmission lines are arranged in a nested configuration that maximizes space utilization, with inner and outer spirals coupled through vertical connections, effectively packing the circuit into a minimal area.
2Ease of operation
If the dual-balun circuit architecture is used, then balanced mixing is achieved, but the circuit size becomes considerably large
Solution Approach 1:
The dual Marchand balun circuit is implemented using a multilayer architecture where the two balun circuits are positioned on different layers and coupled through vertical interconnections. This 3D arrangement allows the balanced mixing functionality to be achieved while significantly reducing the planar footprint compared to a conventional single-layer implementation.
Solution Approach 2:
The patent merges the two separate balun circuits into a tightly integrated dual Marchand balun structure. By combining the RF and LO balun circuits in close proximity with shared grounding and coupling structures, the overall circuit size is reduced while maintaining the balanced mixing capability through the coordinated operation of both balun circuits.
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 miniaturized dual-balanced mixer circuit achieves efficient frequency mixing with reduced layout space, providing insertion loss, phase error, and conversion gain within desired frequency ranges, while maintaining effective LO-to-RF isolation, making it suitable for IC fabrication.
Implementation Method 1
the transmission lines between the first circuit layout plane and the second circuit layout plane as well as the transmission lines between the second circuit layout plane and the third circuit layout plane are arranged with broadside inductive coupling into a dual Marchand balun circuit architecture
Data Source
AI summary
A miniaturized dual-balanced mixer circuit based on a multilayer 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 3-dimensional double-spiral circuit 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.