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STWBC2-HP Fiches technique(PDF) 33 Page - STMicroelectronics

No de pièce STWBC2-HP
Description  Digital controller for wireless battery charger transmitters
PDF  96 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STWBC2-HP Fiches technique(HTML) 33 Page - STMicroelectronics

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Hz =a0+a1.z−1+a2.z−2+a3.z−3
1+b1.z−1+b2.z−2+b3.z−3
To perform the required operation, the filtering machine has the following structure:
Figure 36. Phase modulator filter machine structures overview
The machine is based on a MAC (multiply-and-accumulate) and a set of registers to implement the samples
delay. The sequencer drives the MAC operation, selects the delayed sample to be processed and supplies the
coefficient. Filter coefficients are fixed but 4 sets exist for the HPF and LPF.
The corresponding frequency response is shown below:
Figure 37. LPF (Low Pass Filter) demodulator frequency response
STWBC2-HP
Digital AFE functions
DS13825 - Rev 1.0
page 33/96



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