switchedcapacitorkretser

Switched capacitor circuits are electronic circuits that use switches and capacitors to mimic the behavior of resistors. They are often employed in integrated circuits where the creation of precise resistors can be challenging or consume too much space. The fundamental principle involves transferring charge between capacitors using switches, effectively simulating current flow, which is analogous to current flowing through a resistor.

The effective resistance of a switched capacitor circuit is determined by the capacitance value and the switching frequency. By varying the switching frequency, the effective resistance can be dynamically adjusted without changing the physical components. This property makes switched capacitor circuits useful for tunable filters and amplifiers.

These circuits are particularly advantageous in applications requiring low power consumption and high precision, such as in analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). They can achieve high accuracy because capacitor values are generally more predictable and easier to fabricate precisely on-chip compared to resistors, especially at smaller technology nodes.

However, switched capacitor circuits are not without their limitations. They can introduce noise due to the switching action and can be susceptible to charge-sharing errors. The performance is also dependent on the accuracy of the clock signal used to control the switches. Despite these drawbacks, their efficiency and integration capabilities make them a cornerstone of modern analog and mixed-signal integrated circuit design.