Dual-Amplifier Switching Circuit for Fast Charging With Lower Thermal Noise

The patent applies dynamics by making the amplifier's gain bandwidth product adjustable rather than fixed. The system dynamically switches between high-speed mode (first gain bandwidth product) and low-speed mode (second gain bandwidth product) based on the charging requirements. This allows the amplifier to operate at high speed when needed while reducing noise when high speed is not required, resolving the contradiction between speed and noise amplification.

The patent changes the operational parameters of the amplifier by providing two different gain bandwidth products. The first gain bandwidth product enables high-speed operation for quick charging, while the second gain bandwidth product reduces thermal noise amplification. The control circuit switches between these parameter settings based on the charging phase, allowing the system to optimize both speed and noise performance at different times.

The patent extracts the noise reduction function from a separate post-processing circuit and integrates it into the amplifier's core operation. Instead of adding an external noise reduction circuit at the output (which would increase circuit size), the system uses the switching circuit to select between different amplifier configurations, one of which inherently provides noise reduction. This approach reduces noise without requiring additional external components.

The switching circuit acts as an intermediary that selects between different amplifier operating modes. Rather than directly processing the amplified signal through complex noise reduction circuits, the switching circuit mediates by routing the signal through appropriate amplifier configurations that inherently provide noise reduction, thereby avoiding the need for additional complex noise reduction hardware.