Magnetically Tuned Attenuator for Low-Noise Gain Compensation
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Solution Overview
Problem
Existing attenuators in radar transceivers degrade uncorrelated noise when used for gain compensation, leading to a decrease in signal-to-noise ratio, and require additional hardware resources.
Innovation Solution
A tunable attenuator is designed with transformer windings and conductive loops underneath, controlled by a MOS switch and voltage control circuit, which allows for adjustable attenuation without significantly increasing hardware resources and minimizing noise degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional attenuators are used for gain compensation, then temperature compensation is achieved, but uncorrelated noise is degraded and signal-to-noise ratio decreases
Solution Approach 1:
The patent replaces conventional resistive attenuators with a transformer-based magnetic coupling system. The attenuator uses magnetic field coupling between primary and secondary windings instead of resistive elements, fundamentally changing the attenuation mechanism from electrical resistance to magnetic induction. This substitution eliminates the noise degradation inherent in resistive attenuation while maintaining temperature compensation capability.
Solution Approach 2:
The patent changes the operating parameters of the transformer by varying the coupling coefficient between windings through adjustable magnetic core positioning or winding configuration. By modifying the magnetic coupling parameter, the attenuation level is tuned without introducing resistive losses, thus maintaining signal-to-noise ratio while achieving temperature compensation.
2Stability of the object's composition
If conventional attenuators are used for gain compensation, then temperature stability is achieved, but additional hardware resources are required
Solution Approach 1:
The transformer structure serves multiple functions simultaneously: it provides impedance transformation, signal coupling, and temperature compensation through its magnetic coupling mechanism. The same magnetic core and windings that enable signal transmission also provide the attenuation and temperature stability, eliminating the need for separate compensation hardware.
Solution Approach 2:
The patent merges the attenuator function with the existing transformer structure in the radar transceiver. The magnetic coupling elements are integrated into the existing RF signal path, combining the attenuation function with the impedance matching and signal transformation functions already present in the system, thereby reducing overall hardware complexity.
3Object-affected harmful factors
If transformer windings with conductive loops are used, then tunable attenuation is achieved with minimal noise impact, but control circuit complexity increases
Solution Approach 1:
The magnetic coupling system provides self-adjusting attenuation characteristics based on temperature variations. The conductive loops and magnetic core automatically adjust the coupling coefficient in response to temperature changes, reducing the need for complex external control circuits while maintaining low noise performance.
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 solution provides tunable attenuation with reduced impact on uncorrelated noise and maintains reliable operation across temperature variations without adding extra hardware, ensuring stable signal quality and compact design.
Implementation Method 1
one or more transformer windings configured to facilitate attenuating a signal
Implementation Method 2
one or more conductive loops provided underneath the transforming windings; a controller configured to control an amount of current flowing through the conductive loops
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
In accordance with a first aspect of the present disclosure, a tunable attenuator is provided, comprising: one or more transformer windings configured to facilitate attenuating a signal; one or more conductive loops provided underneath the transforming windings; a controller configured to control an amount of current flowing through the conductive loops, thereby providing a tunable attenuation of said signal. In accordance with a second aspect of the present disclosure, a corresponding method of producing a tunable attenuator is conceived.