Transformer-Based PALNA Switches for Low-Loss Millimeter-Wave Linearity
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Solution Overview
Problem
Current millimeter-wave switches suffer from poor linearity and increased losses in power amplifier low-noise amplifier (PALNA) systems, especially at millimeter-wave frequencies, where series switch devices add loss and suffer from capacitive feedthrough, limiting the linearity of MIMIC PALNA systems.
Innovation Solution
The implementation of a transformer-based Single-Pole Single-Throw (SPST) or Single-Pole Multi-Throw (SPMT) switch, which replaces the quarter-wave power distribution network, providing improved linearity and inherent ESD protection, with a transformer having a primary and secondary winding connected to ground, and switches connected to the secondary winding for reduced insertion loss and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If series switch devices are used to increase power handling capability, then power handling capability is improved, but insertion loss increases and isolation decreases
Solution Approach 1:
The switch is divided into multiple devices connected in series, where each device handles a portion of the total voltage. This segmentation allows the switch to handle higher power levels while maintaining lower insertion loss per device, as each transistor operates at a lower voltage stress level.
Solution Approach 2:
The patent transitions from planar device layout to a three-dimensional stacked configuration. By stacking switch devices vertically in series, the design achieves higher power handling capability without proportionally increasing the footprint area, while managing insertion loss through optimized interconnect structures.
2Power
If series switch devices are used to increase power handling capability, then power handling capability is improved, but isolation decreases
Solution Approach 1:
Grounded intermediate nodes are introduced between the series-connected switch devices. These intermediary ground connections provide isolation barriers that prevent signal leakage and capacitive coupling between non-adjacent switch stages, thereby maintaining high isolation performance even as power handling capability increases through additional series devices.
Solution Approach 2:
Different portions of the switch network are assigned different functions: certain regions are optimized for signal transmission while others are dedicated to isolation and grounding. This local optimization allows series devices to be configured with varying degrees of isolation structures tailored to their specific positions in the stack.
3Ease of operation
If quarter-wave power distribution network is used, then power distribution is achieved, but footprint area increases
Solution Approach 1:
The patent replaces the traditional planar quarter-wave transmission line structures with a three-dimensional stacked switch configuration. This vertical integration achieves the same power distribution function in a reduced footprint area by utilizing the third dimension (height) rather than expanding horizontally.
Solution Approach 2:
Multiple functions previously performed by separate components (power distribution, switching, and isolation) are merged into a single integrated stacked switch structure. This consolidation eliminates the need for separate quarter-wave networks while maintaining power distribution capability, thereby reducing overall footprint 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
This solution achieves up to a 6-dB improvement in linearity and lower insertion loss compared to previous power combining techniques, offering a compact and efficient switch design suitable for millimeter-wave frequencies with reduced power consumption and improved differential operation.
Implementation Method 1
a transformer having a primary and secondary winding, wherein one end of the primary winding is connected to the input single pole port and the other end is configured to be connected to a ground potential
Data Source
AI summary
An improved transformer based switch for PALNA applications. The transformer based switch having an input single pole port and a circuit with at least one transformer and at least one switch configured to connect portions of the transformer to ground or to short the transformer. The primary side of the transformer being connected to the input port and the secondary side of the transformer being connected to an output port.