公开(公告)号：EP2180593A1

公开(公告)日：2010-04-28

申请号：EP08167383.2

申请日：2008-10-23

Applicant: STMicroelectronics Belgium N.V. ,  Semiconductor Ideas to The Market (ItoM) BV

Inventor： Terryn, Steven ,  Borremans, Marc ,  Goetschalckx, Paul

IPC: H03D7/16

CPC classification number: H03D7/161 ,  H03D7/166 ,  H03D2200/0047 ,  H03D2200/0082

Abstract: Methods and devices for the compensation for variations in the frequency drift of a free-running VCO/DCO (voltage/digital controlled oscillator), e.g. inside a frequency synthesizer, are described. In one aspect, the frequency drift of the high-frequency synthesizer is compensated by adjusting the frequency of the baseband signal.
A counter unit is used to determine the frequency offset between the frequency of the free-running oscillator and a reference clock. A difference signal is used to correct the upstream or downstream signal.

Abstract translation: 用于补偿自由运行的VCO / DCO（电压/数字控制振荡器）的频率漂移变化的方法和装置，例如， 在频率合成器内部进行描述。 一方面，通过调整基带信号的频率来补偿高频合成器的频率漂移。 计数器单元用于确定自由振荡器的频率与参考时钟之间的频率偏移。 差分信号用于校正上行或下行信号。

公开(公告)号：EP1638210A1

公开(公告)日：2006-03-22

申请号：EP04077551.2

申请日：2004-09-15

Applicant: STMicroelectronics Belgium N.V.

Inventor： Borremans, Marc ,  Goetschalckx, Paul ,  Monterastelli, Andrea

IPC: H04B1/04 ,  H03D7/16 ,  H03C3/40

CPC classification number: H03J1/005 ,  H04B2001/0491

Abstract: An RF transmitter suitable for ISM band transmissions has an IF modulator (120) and an RF modulator (150), the IF modulator being arranged to use a very-low-IF-frequency f IF , smaller than half the channel bandwidth, such that spurious unwanted modulation components fall in other channels having a channel number within one or two of a channel being transmitted. This can reduce the VCO pulling problem and reduce adjacent channel power degradation compared to using higher IF frequencies. The local oscillator PLL's fractionality is used in order to optimize the adjacent power frequency plan by selecting the most appropriate IF frequency. For the "Bluetooth ® Wireless Technology" application, the IF frequency is

Abstract translation: 适用于ISM频带传输的RF发射机具有IF调制器（120）和RF调制器（150），IF调制器被配置为使用小于信道带宽一半的非常低的IF频率f IF，使得 杂散的不需要的调制分量落在其它信道中，其中信道号正在传输的信道的一个或两个之内。 与使用较高的IF频率相比，这可以减少VCO牵引问题并降低相邻信道功率的降低。 使用本地振荡器PLL的分数，以通过选择最合适的IF频率来优化相邻功率频率计划。 对于“蓝牙®无线技术”应用，IF频率<500kHz，主要无滤波杂散分量（1LO.xBB，x：-3，-2，...，+ 3）图像，载波， 对于0和1个FM信号，拉动被定位在相邻信道的频带中。

公开(公告)号：EP1638210B1

公开(公告)日：2009-05-06

申请号：EP04077551.2

申请日：2004-09-15

Applicant: STMicroelectronics Belgium N.V.

Inventor： Borremans, Marc ,  Goetschalckx, Paul ,  Monterastelli, Andrea

IPC: H04B1/04 ,  H03D7/16 ,  H03C3/40

CPC classification number: H03J1/005 ,  H04B2001/0491