Low-Voltage High-Frequency Switch With Parallel Diode Paths
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Solution Overview
Problem
High frequency switches face issues with increased ON-resistance and voltage fluctuations when the control voltage is reduced, leading to deteriorated insertion loss and harmonic distortion, limiting the reduction of control voltage.
Innovation Solution
A low-voltage control high-frequency switch design featuring parallel connection circuits with shared inductors and diodes, allowing for reduced control voltage operation without compromising insertion loss or harmonic distortion, and eliminating the need for additional capacitors, thereby reducing module size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the control voltage of the high frequency switch is reduced to reduce power consumption, then power consumption decreases, but the ON-resistance of the diodes increases and voltage fluctuations occur, leading to deteriorated insertion loss and harmonic distortion
Solution Approach 1:
The patent divides the control voltage application by introducing separate control voltage input terminals for each diode (first control voltage input terminal for first diode, second control voltage input terminal for second diode). This segmentation allows independent control of each diode's switching state, enabling low-voltage control without compromising the conducting state quality, thus resolving the contradiction between power consumption reduction and performance maintenance.
Solution Approach 2:
The patent changes the control parameter from a single shared control voltage to individual control voltages applied separately to each diode. By applying control voltages independently to the first and second diodes, the system achieves effective switching at lower voltages while maintaining stable ON-resistance and preventing voltage fluctuations, thereby improving both power efficiency and signal characteristics.
2Device complexity
If diodes are connected in series with shared control voltage to reduce component count, then device complexity decreases, but control voltage must be high enough to forward-bias both diodes, limiting voltage reduction
Solution Approach 1:
Instead of using a single shared control voltage terminal, the patent segments the control voltage input into separate terminals for each diode. This segmentation enables each diode to be controlled independently at lower voltages, eliminating the need to sum the forward voltage requirements of multiple diodes in series, thus reducing the overall control voltage level while maintaining manageable device complexity.
3Reliability
If additional capacitors are added to stabilize diode operation at low control voltages, then insertion loss and harmonic distortion improve, but device complexity and cost increase
Solution Approach 1:
The patent achieves voltage stability by changing the control approach from shared to individual control voltages for each diode. This parameter change eliminates the need for additional stabilizing capacitors, as each diode's conducting state is directly controlled by its own dedicated control voltage terminal, maintaining stable operation without increasing device complexity or requiring extra passive components.
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
Enables on-off control with lower control voltage, improves insertion loss and harmonic distortion characteristics, and reduces the number of components, resulting in a more efficient and cost-effective high-frequency switching solution.
Implementation Method 1
a first diode and a second diode that are different from each other, a first current path that includes the first diode, a second current path that includes the second diode, a shared inductor through which direct currents passing through the first and second current paths pass in common
Data Source
AI summary
In a first high frequency switch, a current path and a current path are connected in parallel. When a positive voltage is applied to a control terminal, a current flows through a path passing through (Vc2)→(DL)→(DSL1)→(DDI)→(GSL2)→(DL) and a path passing through (Vc2)→(DR)→(DD2)→(DL). In a second high frequency switch, a current path and a current path are connected in parallel. When a positive voltage is applied to a control terminal, a current flows through a first path and a second path. Thus, the transmission signal is switched with a low control voltage and deterioration of insertion loss characteristics or harmonic distortion characteristics is prevented.