Power Amplifier Bias Interruption Under Over-Voltage Conditions

The patent introduces a power amplifier over-voltage circuit as an intermediary component between the power source and the power amplifier. This circuit includes a bias circuit that provides a bias signal to the power amplifier, and an over-voltage detection mechanism that interrupts the bias signal when excessive voltage is detected, thereby protecting the power amplifier from over-voltage damage while allowing continuous operation under normal conditions

The patent implements preliminary protection by continuously monitoring the voltage level through the bias circuit before over-voltage damage can occur. The over-voltage circuit is configured to detect voltage exceedance of a predetermined value and interrupt the bias signal in advance, preventing damage before it happens rather than responding after damage occurs

The patent merges the over-voltage protection function with the existing bias circuit that is already necessary for power amplifier operation. The over-voltage detection and interruption functionality is integrated into the bias circuit architecture, allowing the protection mechanism to share components and circuitry with the normal biasing function, thereby minimizing additional complexity

The bias circuit is designed to serve multiple functions: providing normal bias operation during standard conditions and performing over-voltage detection and interruption when voltage exceeds predetermined levels. This multi-functionality reduces the need for separate dedicated protection circuits, thereby limiting the increase in device complexity