Resettable integrator

Description: The low Rds and high peak current capability of the DG419 makes it ideal for discharging an integrator capacitor. A high logic input pulse disconnects the integrator from the analog input and discharges the capacitor. When the logic input lowers, the integrator is triggered. D1 and D2 prevent the capacitor from charging to over 15 V.

The DG419 is a high-performance analog switch known for its low on-resistance (Rds) and ability to handle high peak currents, making it suitable for applications involving the discharge of integrator capacitors. In a typical configuration, a high logic input pulse is applied to the control terminal of the DG419, which effectively disconnects the integrator from the analog input. This action allows the capacitor to discharge rapidly, ensuring that the integrator resets to a known state.

Upon the logic input transitioning to a low state, the integrator circuit is activated, allowing it to begin processing the input signal. To safeguard the circuit from overvoltage conditions, diodes D1 and D2 are employed. These diodes are configured in such a way that they clamp the voltage across the capacitor, preventing it from exceeding 15 V. This protective feature is critical in maintaining the integrity of the circuit components and ensuring reliable operation.

In summary, the combination of the DG419's characteristics and the protective diodes creates a robust integrator circuit that can efficiently manage voltage levels while providing high-speed response times in applications requiring precise signal processing.The low Rds and high peak current capability ofthe DG419 makes it ideal for discharging an·integrator capacitor. A high logic input pulse disconnects the integrator from the analog input and discharges the capacitor.

When the logic input lowers, the integrator is triggered. Dl and D2 prevent the capacitor from charging to over 15 V.