RF Amplifier Protection Circuit with Dynamic Voltage Control
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Solution Overview
Problem
Existing radio frequency amplifying apparatuses have a fixed protection voltage that cannot be adjusted, limiting their versatility across different systems and environments, as they do not account for variations in ambient temperature or signal peak voltages.
Innovation Solution
A radio frequency amplifying apparatus with a protection circuit unit that includes series-connected transistors, where the protection voltage is dynamically controlled using a control signal based on the number of transistors in a turned-off state, determined by parasitic inductor voltage and input signal peak voltage, allowing for adaptive voltage protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed protection voltage is set during manufacturing, then the amplifying transistor is protected from breakdown, but the apparatus cannot adapt to different systems or environmental conditions
Solution Approach 1:
The protection circuit uses a series connection of multiple transistors (first transistor, second transistor, third transistor) where each transistor can be independently controlled to be in on or off state. This dynamic configuration allows the protection voltage to be adjusted in steps, enabling the apparatus to adapt to different system requirements while maintaining reliable protection functionality.
2Adaptability or versatility
If multiple transistors are added in series to enable protection voltage adjustment, then adaptability is improved, but device complexity increases
Solution Approach 1:
The protection circuit is segmented into multiple independent transistor units (first transistor, second transistor, third transistor) connected in series. Each transistor can be controlled independently to provide discrete protection voltage levels. This segmentation allows for flexible voltage adjustment without requiring a completely different circuit design for each voltage level, thereby managing complexity through modular architecture.
Data Source
AI summary
There is provided a radio frequency amplifying apparatus having a protection voltage varying function, including a radio frequency amplifying unit amplifying a radio frequency signal, and a protection circuit unit connected between an output node of the radio frequency amplifying unit and a ground and limiting a voltage in the output node to a level of a preset protection voltage or less when the voltage in the output node is higher than the preset protection voltage, wherein the protection voltage is varied with a control signal.