What is the frequency response of a LC filter?
The frequency response of the second-order class-D LC output filter is critical when selecting the component values for the inductor and capacitor. The LC filter response also varies with speaker load impedance.
What is the phase response of a low pass filter?
Phase response of a single-pole, low-pass filter about the center frequency (in-phase response, left axis; inverted response, right axis). Similarly, the phase response of a single-pole, high-pass filter is given by:
Is the phase shift of the transfer function the same for all filters?
The phase shift of the transfer function will be the same for all filter options of the same order. For the single-pole, low-pass case, the transfer function has a phase shift, Φ, given by Frequency in radians per second is equal to 2π times frequency in Hz ( f ), since there are 2π radians in a 360° cycle.
How are the poles of a filter calculated?
filters are a family of filters with poles distributed Plane (LHP) unit circle, such that the poles are given jknπ(2 +−1)
Do you need a filter in a Class D amplifier?
In higher-power class-D amplifiers, generally above 10 W of output power, a filter on the output of the amplifier is required. The filter is passive in nature and uses both an inductor and a capacitor on each output terminal.
Why is LC filter important in amplifier design?
Proper component selection of the LC filter is critical to meet the desired audio performance, efficiency, EMC/EMI requirements, and cost for the end application. This application report serves as a guide to aid in the section of LC filter components for class-D amplifiers to meet target-design goals of the end system.
Why is only one output used in a se filter?
In a single-ended (SE) configuration, only one output is used to drive the load rather than a pair of outputs operating out of phase, as found in BTL and PBTL configurations. For this reason, only half of the Signal swing is available compared to BTL or a quarter of the total output power.