公开(公告)号：WO2005117402A1

公开(公告)日：2005-12-08

申请号：PCT/IT2005/000281

申请日：2005-05-19

Applicant: STMICROELECTRONICS S.R.L. ,  NICOLLINI, Germano ,  CONFALONIERI, Pierangelo ,  MARTIGNONE, Riccardo

Inventor： NICOLLINI, Germano ,  CONFALONIERI, Pierangelo ,  MARTIGNONE, Riccardo

IPC: H04M1/74

CPC classification number: H04B1/707

Abstract: There is described a circuit for reconstructing an analog signal from a digital signal and wide-band transmission system, particularly for employment in cellular telephony systems, or more in general in mobile communication systems, that adopt the WCDMA standard. The circuit comprises: a digital to analog converter (DAC) suitable for receiving said digital signal and converting it into signal in analog.format; - a low pass-filter (LOW-PASS) connected at the output of said converter for receiving said signal in analog format and providing as output said reconstructed analog signal. Advantageously, the low pass filter (LOW-PASS) is an active filter continuous in time and current­ coupled to the output of the digital-analog converter (DAC) and the digital-analog converter (DAC) is a converter of the current-steering type functioning at sampling frequency greater than the Nyquist frequency of said analog signal to be reconstructed.

Abstract translation: 描述了一种用于从数字信号和宽带传输系统重建模拟信号的电路，特别是用于蜂窝电话系统中的用途，或更一般地在采用WCDMA标准的移动通信系统中。 该电路包括：适于接收所述数字信号并将其转换为模拟信号的数模转换器（DAC）; - 低通滤波器（LOW-PASS），连接在所述转换器的输出端，用于以模拟格式接收所述信号，并提供所述重构模拟信号的输出。 有利地，低通滤波器（LOW-PASS）是连续的数字模拟转换器（DAC）的输出端的时间和电流连续的有源滤波器，并且数模转换器（DAC）是电流转向器 在大于待重构的所述模拟信号的奈奎斯特频率的采样频率下工作。

公开(公告)号：WO2003012983A1

公开(公告)日：2003-02-13

申请号：PCT/EP2002/007524

申请日：2002-07-05

Applicant: STMICROELECTRONICS S.R.L. ,  CONFALONIERI, Pierangelo ,  NICOLLINI, Germano ,  MARTIGNONE, Riccardo

Inventor： CONFALONIERI, Pierangelo ,  NICOLLINI, Germano ,  MARTIGNONE, Riccardo

IPC: H03F3/45

CPC classification number: H03F3/45937 ,  H03F1/303

Abstract: The circuit comprises a differential amplifier (10) with two inputs and two outputs and a common mode regulation circuit. Between a regulation terminal (INCM) of the amplifier and the outputs there are connected a first (C1p) and a second (1m) capacitor and first (C3) and second (C4) capacitive means that by means of controlled switches (SW9-SW12) can be alternatively and simultaneousy connected in parallel with, respectively, the first ((C1p) and the second (C1m) capacitor or between a first (VB) and a second (Vref1) reference voltage terminal. The capacitances C3 and C4 may be different in value such as to satisfy the following equality: Vcmn = Vref1 + '(Vrefp-Vrefm)/2!* (C4-C3)/(C3+C4), where Vcmn is the desired common mode output voltage, Vrefp and Vrefm are the differential output voltages and Vref1 is the voltage of the second reference terminal.are chosen in such a way as to satisfy the following equality : Vcmn = Vref1 + [(Vrefp-Vrefm)/2] * (C4-C3)/(C3+C4), where Vcmn is the desired common mode output voltage, Vrefp and Vrefm are the differential output voltages and Vref1 is the voltage of the second reference terminal.

Abstract translation: 该电路包括具有两个输入和两个输出的差分放大器（10）和一个共模调节电路。 在放大器的调节端子（INCM）和输出端之间连接有第一（C1p）和第二（1m）电容器以及通过受控开关（SW9-SW12）的第一（C3）和第二（C4）电容装置 ）可以分别与第一（（C1p）和第二（C1m）电容器或第一（VB）和第二（Vref1）参考电压端子并联连接，电容C3和C4可以是 不同的值，以满足以下等式：Vcmn = Vref1 +'（Vrefp-Vrefm）/ 2！*（C4-C3）/（C3 + C4），其中Vcmn是期望的共模输出电压，Vrefp和Vrefm 是差分输出电压，Vref1是第二参考端子的电压，以满足以下等式的方式选择：Vcmn = Vref1 + [（Vrefp-Vrefm）/ 2] *（C4-C3）/（ C3 + C4），其中Vcmn是所需的共模输出电压，Vrefp和Vrefm是差分输出电压，Vref1是秒的电压 参考端子。

公开(公告)号：EP1751963B1

公开(公告)日：2009-05-13

申请号：EP05750127.2

申请日：2005-05-19

Applicant: STMicroelectronics S.r.l.

Inventor： NICOLLINI, Germano ,  CONFALONIERI, Pierangelo ,  MARTIGNONE, Riccardo

IPC: H04M1/74 ,  H04B1/707

CPC classification number: H04B1/707

Abstract: There is described a circuit for reconstructing an analog signal from a digital signal and wide-band transmission system, particularly for employment in cellular telephony systems, or more in general in mobile communication systems, that adopt the WCDMA standard. The circuit comprises: a digital to analog converter (DAC) suitable for receiving said digital signal and converting it into signal in analog.format; - a low pass-filter (LOW-PASS) connected at the output of said converter for receiving said signal in analog format and providing as output said reconstructed analog signal. Advantageously, the low pass filter (LOW-PASS) is an active filter continuous in time and current­ coupled to the output of the digital-analog converter (DAC) and the digital-analog converter (DAC) is a converter of the current-steering type functioning at sampling frequency greater than the Nyquist frequency of said analog signal to be reconstructed.

公开(公告)号：EP1751963A1

公开(公告)日：2007-02-14

申请号：EP05750127.2

申请日：2005-05-19

Applicant: STMicroelectronics S.r.l.

Inventor： NICOLLINI, Germano ,  CONFALONIERI, Pierangelo ,  MARTIGNONE, Riccardo

IPC: H04M1/74 ,  H04B1/707

CPC classification number: H04B1/707

Abstract: There is described a circuit for reconstructing an analog signal from a digital signal and wide-band transmission system, particularly for employment in cellular telephony systems, or more in general in mobile communication systems, that adopt the WCDMA standard. The circuit comprises: a digital to analog converter (DAC) suitable for receiving said digital signal and converting it into signal in analog.format; - a low pass-filter (LOW-PASS) connected at the output of said converter for receiving said signal in analog format and providing as output said reconstructed analog signal. Advantageously, the low pass filter (LOW-PASS) is an active filter continuous in time and current­ coupled to the output of the digital-analog converter (DAC) and the digital-analog converter (DAC) is a converter of the current-steering type functioning at sampling frequency greater than the Nyquist frequency of said analog signal to be reconstructed.