Low-Voltage High-Frequency Switch with Parallel Diode Current Routes
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Solution Overview
Problem
Existing high-frequency switches face limitations in reducing control voltage while maintaining low insertion loss and harmonic distortion, particularly when diodes approach their PN junction potential, leading to increased ON resistance and voltage variation.
Innovation Solution
A low-voltage control high-frequency switch design featuring parallel-connected current routes with diodes, an inductor between the parallel connection and ground, and a control-voltage input node, allowing for reduced control voltage application while minimizing signal leakage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If control voltage is reduced to save power, then power consumption decreases, but insertion loss increases and harmonic distortion worsens
Solution Approach 1:
The patent divides the control voltage application into two separate paths: one path applies control voltage to turn ON the diodes (through the inductor to ground), and another path applies control voltage to turn OFF the diodes (through the capacitor to ground). This segmentation allows independent optimization of each switching action, enabling lower overall control voltage while maintaining effective switching performance and reducing power consumption without increasing insertion loss.
Solution Approach 2:
The patent introduces an inductor as an intermediary element connected to ground that works with the capacitor to create a resonant circuit. This intermediary structure enables the control voltage to be applied more efficiently to the diodes, allowing lower control voltage to achieve the same switching effect, thereby reducing power consumption while maintaining low insertion loss.
2Use of energy by moving object
If control voltage is reduced to save power, then power consumption decreases, but harmonic distortion increases
Solution Approach 1:
By segmenting the control voltage application into separate ON and OFF paths with dedicated circuit elements (inductor for ON, capacitor for OFF), the patent enables precise control of each switching transition. This prevents incomplete switching that would generate harmonic distortion, allowing power reduction without compromising signal purity.
Solution Approach 2:
The patent changes the electrical parameters of the control circuit by introducing reactive elements (inductor and capacitor) that modify the voltage and current waveforms applied to the diodes. This enables the control voltage to be reduced while maintaining adequate voltage across the diodes during switching, preventing harmonic distortion generation.
3Ease of operation
If diodes are operated near PN junction potential to reduce control voltage, then control voltage decreases, but ON resistance increases
Solution Approach 1:
The inductor serves as an intermediary that stores energy and releases it to provide sufficient voltage to overcome the diode's PN junction potential during switching. This allows the external control voltage to be lower than the diode's forward voltage requirement, while the inductor supplements the voltage momentarily during switching transitions, maintaining low ON resistance without requiring high control voltage.
Solution Approach 2:
The patent utilizes the phase transition特性 of the inductor and capacitor in the resonant circuit to generate voltage amplification during switching transitions. The energy stored in the inductor's magnetic field and capacitor's electric field is released during switching, providing the necessary voltage to fully turn ON the diodes even when the external control voltage is low, thus maintaining low ON resistance.
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 efficient switching with reduced control voltage, minimizing insertion loss and harmonic distortion, and providing a low-current composite high-frequency component suitable for multiple communication systems.
Implementation Method 1
an inductor arranged between a first node of the parallel connection and a ground
Implementation Method 2
a first current route in which a direct current flows, the first current route including a first diode, and a second current route in which a direct current flows, the second current route including a second diode
Data Source
AI summary
In a transmission/reception selection switch, a first diode is arranged in series with a transmission signal line and a second diode is arranged in shunt with a reception signal line. A first current route where a direct current passes through the first diode is connected in parallel to a second current route where a direct current passes through the second diode. When a predetermined positive voltage is applied to a control terminal, the diodes are turned ON and a direct current flows through, in order, the control terminal, a resistor, an inductor, the diode, a strip line, and an inductor), and a direct current flows through, in order, the control terminal, the resistor, the second diode, and the inductor.