What is a switching capacitor?
The switching capacitor is an electronic component or, more precisely, an electronic circuit or module that usually consists of a capacitor and two switches used to simulate other components in the integrated circuit (IC). The resistor is one of the most common components simulated; Resistors tend to be too large and inaccurate to integrate into the micro size of the IC. The switching capacitor module is commonly used in processing a discrete time signal signal and voice frequency filtering. These functions are made possible by the unique characteristics of the circuits, where electric charges are alternately moved to and out of capacitors. Conventional resistors are particularly problematic in the IC Arena due to their physical size and the difference of resistance values that they encounter in different production runs. The capacitor switch and metal oxide oxide (MOS) used in the module with the switch with the capacitor are, on the other hand, extremely compact and very stable in terms of their values and tolerance.
These properties create extremely compact and accurate internal circuits for microprocessors and integrated circuits. Another advantage of switched capacitors is that the use of these modules, unlike conventional resistors, allows designers of circuits to integrate a certain degree of frequency tuning in active filter applications. This tuning is achieved by changing the clock frequency or switching the pace of the circuit.
The actual value characteristics of saving the module of the switch -switched capacitor can be seen when it believes that a 1 MΩ resistance can be simulated by a small 10 PF capacitor switched 100 kHz. If a normal resistor should be used in this application, the complete circuit would have a size size using a capacitor module many times. For example, a low -pass capacitor filter with a 100 Hz rating will require a resistance of 16 MΩ, which would be obviously impossible to achieve with normal REzistor.
Advances in programmable analog technology IC, which has been seen in the last decade, would not be possible without the benefits of the use of switched capacitor modules. Much enhancements in the field of multi -pole filter and analog technology to digital converter would not be possible even with regard to the physical, non -linear and inconsistent nature of conventional resistors. Thanks to these hips, the switching capacitor is one of the most important progress of electronic components from the introduction of the transistor.