公开(公告)号：US20240178817A1

公开(公告)日：2024-05-30

申请号：US18520167

申请日：2023-11-27

Applicant: STMicroelectronics France

Inventor： Eric Andre ,  Lionel Vogt

IPC: H03H11/04 ,  H03K3/037 ,  H03K17/687 ,  H04B1/04

CPC classification number: H03H11/04 ,  H03K3/037 ,  H03K17/6871 ,  H04B1/04

Abstract: In embodiments, a radio frequency transmitter comprising at least one filtering circuit is provided. The filtering circuit includes a series/parallel shift register comprising a binary input and N binary outputs, with N being an integer greater than or equal to OSR, OSR being an integer greater than or equal to 2. The binary outputs ranging from 0 to N−1, the register receiving a binary data signal at a data frequency on its input and implementing shifts on the N binary outputs at a frequency equal to a multiplier of the data frequency and OSR. The filtering circuit further comprising a first circuit defined by N coefficients Ci. For each non-zero coefficient Ci, a signal determined by the coefficient Ci and by the corresponding one of the binary outputs. The filtering circuit further comprising and an adder circuit delivering an output equal to the sum of analog signals.