Switch Control Circuit Reference Voltage Cut-Off
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Solution Overview
Problem
Existing switch circuit ICs experience temporary variations in power supply potential during signal switching, leading to degradation in insertion loss and high-frequency characteristics.
Innovation Solution
A switch control circuit is designed with multiple first voltage generation circuits and cut-off circuits, where the control circuit disconnects at least one first voltage generation circuit from the reference voltage when a change in signal logic occurs, maintaining a stable power supply and reducing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch circuit IC integrates multiple high-frequency switches into one package, then device integration and compactness are improved, but power supply potential variation occurs during signal switching leading to degradation in insertion loss and high-frequency characteristics
Solution Approach 1:
The control circuit disconnects the reference voltage from voltage generation circuits that will not be used in advance before signal switching occurs. This preliminary action prevents power supply potential variation during switching by ensuring that only the voltage generation circuit corresponding to the selected signal frequency bandwidth remains connected to the reference voltage, thereby maintaining stable power supply and preventing degradation of insertion loss and high-frequency characteristics
Solution Approach 2:
The invention extracts and isolates the active voltage generation circuit from inactive ones by disconnecting the reference voltage from unused circuits. This separation ensures that only the necessary voltage generation circuit remains powered, eliminating the source of power supply potential variation that would otherwise affect the overall switch circuit performance during signal switching
2Adaptability or versatility
If signal path switching is performed during communication, then frequency bandwidth selection is improved, but power supply potential temporarily varies causing performance degradation
Solution Approach 1:
The control circuit monitors the selected signal frequency bandwidth and provides feedback control by selectively connecting or disconnecting the reference voltage to or from specific voltage generation circuits. This feedback mechanism ensures that the power supply potential remains stable during frequency bandwidth switching by dynamically adjusting which voltage generation circuits remain connected to the reference voltage based on the active signal path
Data Source
AI summary
A switch control circuit includes a plurality of first voltage generation circuits that generate a plurality of second control signals by level-shifting a plurality of first control signals using a reference voltage. A plurality of cut-off circuits controlling whether or not to supply the reference voltage to a corresponding one of the plurality of first voltage generation circuits. A control circuit is configured to control the cut-off circuits in such a manner that the reference voltage supplied to at least one first voltage generation circuit is cut off to the other first voltage generation circuits after a state of the first control signal supplied to the at least one first generation circuit is changed. In some embodiments, the reference voltage to the other first generation circuits is cut-off for a predetermined time period.