Limiter Circuit With Coupled Inductors for Out-of-Band Suppression
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Solution Overview
Problem
Conventional limiter circuits inadequately suppress signals outside the set frequency band, necessitating additional filter circuits, which complicates miniaturization due to increased component count.
Innovation Solution
A limiter circuit design incorporating a capacitive element, inductors, and anti-parallel diodes with electromagnetic field coupling, forming coupling capacitance and parasitic resistance to effectively suppress out-of-band signals while minimizing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional limiter circuit with anti-parallel diode pair is used, then the power of high frequency signal is suppressed when it exceeds a predetermined value, but signals outside the set frequency band are not sufficiently suppressed
Solution Approach 1:
The patent merges the limiter function and band-pass filter function into a single integrated circuit. The anti-parallel diode pair is combined with series inductors and shunt capacitors to create a unified structure that simultaneously limits power and filters frequency bands, eliminating the need for separate filter circuits.
Solution Approach 2:
The circuit components serve multiple functions: the anti-parallel diode pair provides both power limiting and frequency selection, while the inductors and capacitors contribute to both impedance matching and band-pass filtering. This multi-functionality allows the circuit to achieve both power suppression and frequency band suppression within a single configuration.
2Reliability
If a separate filter circuit is added to suppress signals outside the frequency band, then frequency band suppression is improved, but the number of parts increases
Solution Approach 1:
The patent merges the limiter function and band-pass filter function into a single integrated circuit. The anti-parallel diode pair is combined with series inductors and shunt capacitors to create a unified structure that simultaneously limits power and filters frequency bands, eliminating the need for separate filter circuits.
Solution Approach 2:
The circuit components serve multiple functions: the anti-parallel diode pair provides both power limiting and frequency selection, while the inductors and capacitors contribute to both impedance matching and band-pass filtering. This multi-functionality allows the circuit to achieve both power suppression and frequency band suppression within a single configuration.
3Device complexity
If the number of parts is reduced for miniaturization, then device complexity is reduced, but sufficient frequency band suppression becomes difficult to achieve
Solution Approach 1:
The patent merges the limiter function and band-pass filter function into a single integrated circuit. The anti-parallel diode pair is combined with series inductors and shunt capacitors to create a unified structure that simultaneously limits power and filters frequency bands, eliminating the need for separate filter circuits.
Solution Approach 2:
The circuit components serve multiple functions: the anti-parallel diode pair provides both power limiting and frequency selection, while the inductors and capacitors contribute to both impedance matching and band-pass filtering. This multi-functionality allows the circuit to achieve both power suppression and frequency band suppression within a single configuration.
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 design achieves robust suppression of signals outside the set frequency band and reduces the number of components, enabling miniaturization of the limiter circuit.
Implementation Method 1
the first inductor and at least one of the first diode and the second diode have an electromagnetic field coupling relationship
Implementation Method 2
the anti-parallel diode pair is in an off state and can be considered to be a parasitic capacitance
Implementation Method 3
the anti-parallel diode pair goes into an on state and has a low impedance, and thus shows high reflectance properties
Data Source
AI summary
A first inductor is connected to an input terminal through a capacitive element. To the first inductor, an anti-parallel diode pair including a first diode and a second diode, and a second inductor are connected. The first inductor and the anti-parallel diode pair are coupled to each other by an electromagnetic field, thereby forming a coupling capacitance.