Semiconductor Filter Circuit for Rapid Control Voltage Stabilization

The filter circuit dynamically changes its capacitive configuration based on the conduction state of the first switch element. When the switch is non-conductive, the second capacitive element is coupled between first voltage and second voltage, providing full noise filtering. When the switch is conductive, the second capacitive element couples with the first capacitive element through the output node, reducing total capacitance and accelerating voltage stabilization while maintaining adequate noise filtering.

The filter circuit operates in periodic phases: during normal operation, the switch is non-conductive and full capacitance provides noise filtering; during voltage transitions, the switch becomes conductive to reduce capacitance and speed up stabilization. This periodic switching between high-capacitance (filtering) and low-capacitance (fast response) states resolves the contradiction between noise removal and stabilization speed.

The filter circuit is designed to perform multiple functions: noise filtering, voltage stabilization, and dynamic capacitance adjustment. The first and second capacitive elements work together to provide both filtering and fast transient response, while the switch element enables the circuit to adapt its characteristics based on operating conditions. This multi-functionality reduces the need for separate circuits for each function.

The filter circuit merges the noise filtering function with the voltage stabilization function in a single integrated structure. The capacitive elements serve dual purposes: filtering noise during steady state and enabling fast voltage transitions during mode changes. This consolidation reduces device complexity compared to having separate filtering and stabilization circuits.