公开(公告)号：US6122326A

公开(公告)日：2000-09-19

申请号：US895445

申请日：1997-07-15

申请人： Thomas Jackson ,  David Bourner ,  Hai Tang

发明人： Thomas Jackson ,  David Bourner ,  Hai Tang

IPC分类号： H03B27/00 ,  H03B28/00 ,  H03C3/09 ,  H03C5/00 ,  H03D7/00 ,  H03L7/18 ,  H03L7/23 ,  H04L27/20

CPC分类号： H03L7/23 ,  H03C3/0908 ,  H03C3/0983 ,  H03D7/00 ,  H03B27/00 ,  H03B28/00 ,  H03C5/00 ,  H03L7/1806

摘要： An apparatus for generating a modulated signal which includes a modulator operative for receiving a first signal and input data signals, and modulating the first signal in accordance with the input data signals so as to produce a modulated reference signal; a first frequency divider coupled to the modulator output, operative to reduce the frequency of the modulated reference signal by a predetermined factor; a signal generator operative to produce a second signal; a first mixer having a first input coupled to an output of the first frequency divider and a second input coupled to the output of the signal generator. The first mixer operates to frequency translate the modulated reference signal by an amount equal to the frequency of the second signal. In addition, the signal generator of the present invention contains a direct digital synthesizer coupled to a second phase lock loop which operates to up-convert the output signal of the DDS to the microwave region. The feedback network of the second phase lock loop utilizes frequency translation to down-convert the output signal in order to close the loop.

公开(公告)号：US06356597B1

公开(公告)日：2002-03-12

申请号：US09625290

申请日：2000-07-25

申请人： Thomas Jackson ,  David Bourner ,  Hai Tang

发明人： Thomas Jackson ,  David Bourner ,  Hai Tang

IPC分类号： H04L2720

CPC分类号： H03L7/23 ,  H03B27/00 ,  H03B28/00 ,  H03C3/0908 ,  H03C3/0983 ,  H03C5/00 ,  H03D7/00 ,  H03L7/1806

摘要： An apparatus for generating a modulated signal which includes a modulator operative for receiving a first signal and input data signals, and modulating the first signal in accordance with the input data signals so as to produce a modulated reference signal; a first frequency divider coupled to the modulator output, operative to reduce the frequency of the modulated reference signal by a predetermined factor; a signal generator operative to produce a second signal; a first mixer having a first input coupled to an output of the first frequency divider and a second input coupled to the output of the signal generator. The first mixer operates to frequency translate the modulated reference signal by an amount equal to the frequency of the second signal. In addition, the signal generator of the present invention contains a direct digital synthesizer coupled to a second phase lock loop which operates to up-convert the output signal of the DDS to the microwave region. The feedback network of the second phase lock loop utilizes frequency translation to down-convert the output signal in order to close the loop.

摘要翻译： 一种用于产生调制信号的装置，包括调制器，用于接收第一信号和输入数据信号，并根据输入数据信号对第一信号进行调制以产生调制参考信号; 耦合到所述调制器输出的第一分频器，用于将调制的参考信号的频率降低预定因子; 操作以产生第二信号的信号发生器; 第一混频器具有耦合到第一分频器的输出端的第一输入端和耦合到信号发生器的输出端的第二输入端。 第一混频器用于对调制参考信号进行频率转换等于第二信号频率的量。 此外，本发明的信号发生器包含耦合到第二锁相环的直接数字合成器，其操作以将DDS的输出信号上变频到微波区域。 第二锁相环的反馈网络利用频率转换来对输出信号进行下变频以便闭环。

公开(公告)号：US06683918B2

公开(公告)日：2004-01-27

申请号：US10079615

申请日：2002-02-19

申请人： Thomas Jackson ,  David Bourner ,  Hai Tang

发明人： Thomas Jackson ,  David Bourner ,  Hai Tang

IPC分类号： H04L2720

CPC分类号： H03L7/23 ,  H03B27/00 ,  H03B28/00 ,  H03C3/0908 ,  H03C3/0983 ,  H03C5/00 ,  H03D7/00 ,  H03L7/1806

摘要： An apparatus for generating a modulated signal which includes a modulator operative for receiving a first signal and input data signals, and modulating the first signal in accordance with the input data signals so as to produce a modulated reference signal; a first frequency divider coupled to the modulator output, operative to reduce the frequency of the modulated reference signal by a predetermined factor; a signal generator operative to produce a second signal; a first mixer having a first input coupled to an output of the first frequency divider and a second input coupled to the output of the signal generator. The first mixer operates to frequency translate the modulated reference signal by an amount equal to the frequency of the second signal. In addition, the signal generator of the present invention contains a direct digital synthesizer coupled to a second phase lock loop which operates to up-convert the output signal of the DDS to the microwave region. The feedback network of the second phase lock loop utilizes frequency translation to down-convert the output signal in order to close the loop.

摘要翻译： 一种用于产生调制信号的装置，包括调制器，用于接收第一信号和输入数据信号，并根据输入数据信号对第一信号进行调制以产生调制参考信号; 耦合到所述调制器输出的第一分频器，用于将调制的参考信号的频率降低预定因子; 操作以产生第二信号的信号发生器; 第一混频器具有耦合到第一分频器的输出端的第一输入端和耦合到信号发生器的输出端的第二输入端。 第一混频器用于对调制参考信号进行频率转换等于第二信号频率的量。 此外，本发明的信号发生器包含耦合到第二锁相环的直接数字合成器，其操作以将DDS的输出信号上变频到微波区域。 第二锁相环的反馈网络利用频率转换来对输出信号进行下变频以便闭环。

公开(公告)号：US06366620B1

公开(公告)日：2002-04-02

申请号：US09657705

申请日：2000-09-08

申请人： Thomas Jackson ,  David Bourner ,  Hai Tang ,  Mohammad N. Bukhari ,  Robert Hannah

发明人： Thomas Jackson ,  David Bourner ,  Hai Tang ,  Mohammad N. Bukhari ,  Robert Hannah

IPC分类号： H04L2720

CPC分类号： H03C3/0983 ,  H03B27/00 ,  H03B28/00 ,  H03C5/00 ,  H03D7/00 ,  H03L7/1806 ,  H03L7/23

摘要： A VSAT system for generating and transmitting a modulated data signal to a satellite. The VSAT system includes an indoor unit for generating a modulated data signal having an envelope of constant amplitude, and an outdoor unit including a transmitter module operative to receive the modulated data signal and to frequency multiply and amplify the modulated data signal so as to produce a modulated carrier signal having an envelope of constant amplitude. The transmitter module includes a multiplier operative to frequency multiply the modulated data signal to the frequency of the modulated carrier signal, and a power amplifier operated in the saturation mode, which amplifies the modulated carrier signal to the desired power level. The components constituting the transmitter module are formed on a single integrated circuit.

摘要翻译： 一种VSAT系统，用于产生和发送调制数据信号到卫星。 VSAT系统包括用于产生具有恒定幅度的包络的调制数据信号的室内单元，以及包括发射机模块的室外单元，其操作以接收调制的数据信号，并对所调制的数据信号进行频率乘法和放大，以产生 具有恒定幅度的包络的调制载波信号。 发射机模块包括可操作以将调制数据信号频率乘以调制载波信号的频率的乘法器和在饱和模式下操作的功率放大器，其将经调制的载波信号放大到所需功率电平。 构成发射机模块的部件形成在单个集成电路上。