How does a filter capacitor work?

A filter capacitor, CFLT, is connected from each input pin of the ADC to the ground (as shown in Equation 1 and Figure 3). This capacitor helps reduce the sampling charge injection and provides a charge bucket to quickly charge the internal sample-and-hold capacitors during the acquisition process.

Why is a sampling capacitor important for a driver amplifier?

As a result, the selected input sampling capacitor of the ADC dictates the minimum value of the charge bucket capacitor belonging to the input driver filter, which presents stability and distortion challenges for the driver amplifier.

What is a DC link capacitor?

r t M C yk T T S S VS M Figure 1 Half-bridge with high-side and low-side switches driving a brushed DC motor in PWM mode The input capacitor, also known as DCLINK capacitor, stabilizes the supply voltage and provides instantaneous current to the PWM operated half-bridge.

What is a VDD bypass capacitor?

Bypass capacitors are used to filter AC components from the constant power supply and conduct an alternating current around the gate driver. The VDD bypass capacitor should be placed as close as possible to the gate driver to improve the AC noise filtering performance and reduce the lead inductance, as shown in yellow in Figure 6.

What should be considered when selecting a dclink capacitor?

When selecting a DCLINK capacitor, the ESR behavior versus temperature, in particular for cold temperatures, should be considered. In the example shown in Figure 9 the VSpp voltage almost doubles at cold temperatures from 450mVpp to 800mVpp due to the increase of ESR at cold temperature.

Which capacitor should be used if load capacitance is 10 nF?

If a bypass capacitor with 10 nF is used in case of the load capacitance being 10 nF, VDD fluctuates from 6 V to 15.5 V. In order to ensure the reliability of the circuit, for example with a 10 nF load, a block capacitor of at least 200 nF should be used.