High Frequency Switch Using Anti-Parallel Diodes for Self-Control
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Solution Overview
Problem
Conventional high frequency switches require external control signals and complex control circuits, especially when operating at fast speeds or high voltages, leading to large peripheral circuit sizes.
Innovation Solution
A high frequency switch utilizing anti-parallel diodes that switch states based on input high frequency power, eliminating the need for external control signals and simplifying the control circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional high frequency switches use external control signals and control circuits for switching, then the switching operation can be performed, but the circuit scale of the control circuit becomes large
Solution Approach 1:
The high frequency switch utilizes the input high frequency signal itself to control the switching operation through the anti-parallel diode configuration. The diodes automatically switch states based on the power level of the input signal, eliminating the need for external control circuits and achieving self-service operation.
Solution Approach 2:
The invention extracts and eliminates the external control circuit from the system by using the input high frequency signal directly for switching control. The control function is integrated into the signal path itself through the anti-parallel diode arrangement, removing the separate control circuit component.
2Productivity
If high frequency switch operates at fast speed or high voltage, then switching performance is improved, but complex control circuit is necessary
Solution Approach 1:
The anti-parallel diode configuration enables the switch to automatically respond to high frequency signals at fast speeds and high voltages without requiring complex external control circuits. The diodes inherently switch based on the signal characteristics, providing self-service operation that maintains high performance while minimizing circuit complexity.
3Device complexity
If anti-parallel diodes are used as switching element, then circuit complexity is reduced, but need to ensure proper switching based on input power
Solution Approach 1:
The anti-parallel diode configuration exploits changes in the electrical parameters (conductance) of the diodes based on the power level of the input high frequency signal. At high power levels, the diodes conduct and provide a low-impedance path, while at low power levels, they block the signal, achieving reliable switching based on power parameter detection.
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 enables a compact high frequency switch with reduced circuit complexity, capable of operating without external control signals and minimizing noise leakage, while allowing high power transmission with low loss.
Implementation Method 1
a first anti-parallel diode which has one end coupled with a first high-frequency-signal input/output terminal, has another end coupled with a second high-frequency-signal input/output terminal, and becomes a conduction state when input power of equal to or greater than predetermined high frequency power is input
Data Source
AI summary
A compact high frequency switch needing no external control signal is obtained. The high frequency switch includes an anti-parallel diode (first anti-parallel diode) having one end and another end coupled with an antenna terminal (first high-frequency-signal input/output terminal) and a transmitting terminal (second high-frequency-signal input/output terminal), respectively, and becoming a conduction state in the input power not less than predetermined high frequency power. When the high frequency switch is an SPDT type, such a switch may include a ¼-wavelength line in the use frequency of the high frequency switch having one end and another end coupled with the antenna terminal and a receiving terminal (third high-frequency-signal input/output terminal), respectively, and an anti-parallel diode (second anti-parallel diode) coupled between the receiving terminal and a ground and becoming a conduction state in the input power not less than predetermined high frequency power.