公开(公告)号：US5731772A

公开(公告)日：1998-03-24

申请号：US790399

申请日：1997-01-29

申请人： Pekka Mikkola ,  Markku Lintinen ,  Jukka Ranta

发明人： Pekka Mikkola ,  Markku Lintinen ,  Jukka Ranta

IPC分类号： H03M1/06 ,  H03C3/40 ,  H03M1/10 ,  H03M1/66

CPC分类号： H03M1/1019 ,  H03C3/40 ,  H03M1/0682 ,  H03M1/66

摘要： Disclosed is a method and a device for compensating the DC offset (dU) of a D/A converter (2), particularly in the base frequency modulator of a mobile phone. The method and the device use an error correction register (5), whose value is changed on the basis of the DC offset, and which is added to each signal sample to be converted for compensating the DC offset. The value of the error correction register (5) is changed in a testing mode so that a preset control value is fed into the D/A converter (2), corresponding to the zero voltage of the output of an ideal D/A converter; the voltage values of outputs of a differential output pair (2a, 2b) arranged in connection with the D/A converter (2) are compared to verify the polarity of the voltage difference (dU) of the outputs and the polarity, i.e. the sign, of a relative DC offset; and, on the basis of the polarity of the voltage difference (dU), the value of the error correction register (5) is either decreased or increased by one from the preset initial value which is preferably zero.

摘要翻译： 公开了一种用于补偿D / A转换器（2）的DC偏移（dU）的方法和装置，特别是在移动电话的基频调制器中。 该方法和装置使用纠错寄存器（5），其值根据DC偏移改变，并且被添加到要转换的每个信号样本以补偿DC偏移。 误差校正寄存器（5）的值在测试模式下改变，使得预设的控制值被馈送到D / A转换器（2）中，对应于理想D / A转换器的输出的零电压; 将与D / A转换器（2）连接配置的差分输出对（2a，2b）的输出的电压值进行比较，以验证输出的电压差（dU）和极性的极性，即符号 ，相对DC偏移; 并且基于电压差（dU）的极性，误差校正寄存器（5）的值从预设的初始值（其优选为零）减小或增加1。

公开(公告)号：US5291474A

公开(公告)日：1994-03-01

申请号：US875545

申请日：1992-04-27

申请人： Raimo Ikonen ,  Pekka Lonka ,  Pekka Mikkola

发明人： Raimo Ikonen ,  Pekka Lonka ,  Pekka Mikkola

IPC分类号： H03D7/16 ,  H04B1/40 ,  H04B1/50

CPC分类号： H03D7/16 ,  H04B1/405

摘要： A procedure is utilized for forming the transmission and reception frequencies required for the operation of a digital radio telephone based on time division multiplex access, in particular, in a radio telephone for the GSM system. According to the procedure, the mixer frequencies used in the transmitter and the receiver of the radio telephone are formed by a synthesizer and a basic oscillator commmon to both the receiver and transmitter. The clock frequency for the logic of the radio telephone and the RF reference frequency to the synthesizer are produced by dividing the output frequency of the common basic oscillator.

摘要翻译： 用于形成基于时分复用接入的数字无线电话操作所需的发送和接收频率的过程，特别是用于GSM系统的无线电话中。 根据该过程，在无线电话机的发射机和接收机中使用的混频器频率由合成器和与接收机和发射机两者共享的基本振荡器形成。 无线电话的逻辑的时钟频率和合成器的RF参考频率是通过划分公共基本振荡器的输出频率来产生的。

公开(公告)号：US5208494A

公开(公告)日：1993-05-04

申请号：US863137

申请日：1992-04-02

申请人： Raimo Ikonen ,  Pekka Lonka ,  Pekka Mikkola

发明人： Raimo Ikonen ,  Pekka Lonka ,  Pekka Mikkola

IPC分类号： H02H3/20 ,  H02M1/12 ,  H04B15/00

CPC分类号： H02H3/202 ,  H02M1/12 ,  H04B15/005 ,  H04B2215/063 ,  H04B2215/069

摘要： This invention relates to a method by which transients can be eliminated in an apparatus comprising a current source and several functional blocks at least one of which produces transients in the operating voltage. According to the invention, a switch separates the current source and the transient-producing block from the other blocks during the time that transients are being produced and connects the current source to the other blocks and to an energy-storing buffer during the time that transients are not being produced.

摘要翻译： 本发明涉及一种在包括电流源和几个功能块的装置中消除瞬变的方法，其中至少一个在工作电压中产生瞬变。 根据本发明，在瞬态产生期间，开关将电流源和瞬态产生块与其他块分离，并且在瞬变时间期间将电流源连接到其他块和能量存储缓冲器 没有生产。

公开(公告)号：US5109538A

公开(公告)日：1992-04-28

申请号：US519118

申请日：1990-05-02

申请人： Raimo Ikonen ,  Pekka Lonka ,  Pekka Mikkola

发明人： Raimo Ikonen ,  Pekka Lonka ,  Pekka Mikkola

IPC分类号： H03G3/20

CPC分类号： H03G3/3042

摘要： The present invention concerns a circuitry for widening the power control range of radio telephone. A radio frequency signal is amplified in a controllable power amplifier (1). According to the invention, after the amplifier a controllable switch (4) is connected, which, while in a first state, does not substantially attenuate the RF power emitted transmitted from the power amplifier (1). The first power control range of the transmitter is thus produced. When the switch (4) is in a second state, it directs part of the RF power transmitted from the power amplifier (1) to a resistive element (R1) and permits part of the RF power to be transmitted to the output (RFout) of the transmitter. A second power control range is produced in this manner.