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公开(公告)号：US07352249B2
公开(公告)日：2008-04-01
申请号：US10679023
申请日：2003-10-03
IPC分类号： H03L7/085
CPC分类号： H03L7/1976 , H03C3/0925 , H03C3/0933 , H03C3/0941 , H03C3/095 , H03J3/00 , H03L7/0805 , H03L7/0893 , H03L7/0898 , H03L7/093 , H04L2027/0081
摘要： A phase-locked loop frequency synthesizer has a charge pump, phase-locked loop filter, voltage-controlled oscillator, and a bandwidth calibration circuit. The bandwidth calibration circuit measures the gain of the voltage-controlled oscillator and uses the measured voltage-controlled oscillator gain to adjust the charge pump level. The charge pump level is adjusted so that a product of the voltage-controlled oscillator gain and the measured charge pump level results in a constant phase-locked loop bandwidth.
摘要翻译： 锁相环频率合成器具有电荷泵，锁相环滤波器，压控振荡器和带宽校准电路。 带宽校准电路测量压控振荡器的增益，并使用测量的压控振荡器增益来调节电荷泵电平。 调整电荷泵电平，使得压控振荡器增益和测量的电荷泵电平的乘积导致恒定的锁相环带宽。
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公开(公告)号：US06785518B2
公开(公告)日：2004-08-31
申请号：US10077286
申请日：2002-02-15
IPC分类号： H04M138
摘要： A transceiver circuit is disclosed for use in radio frequency communication systems. The circuit includes a transmitter circuit, a receiver circuit and a local oscillator circuit. The local oscillator circuit includes at least one oscillator input signal having a frequency that is a non-integer multiple of the transmission frequency of the radio frequency communication system. The oscillator input signal is used to produce a transmitter local oscillator signal and a receiver local oscillator signal.
摘要翻译： 公开了一种用于射频通信系统的收发器电路。 电路包括发射机电路，接收机电路和本机振荡器电路。 本地振荡器电路包括至少一个振荡器输入信号，其频率是射频通信系统的传输频率的非整数倍。 振荡器输入信号用于产生发送器本地振荡器信号和接收器本地振荡器信号。
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公开(公告)号：US6107889A
公开(公告)日：2000-08-22
申请号：US966333
申请日：1997-11-07
CPC分类号： H03L7/0895 , G05F3/262
摘要： A charge pump circuit including current source circuits for maintaining the current sourced from an upper current source substantially equal to the current sunk by a lower current source. The current source circuits include a lower reference current source operable for defining a reference current through a first biasing transistor and a duplicate device in which an output current can be established proportional to the reference current therethrough. A complementary output device is provided for producing the upper current source along with a duplicate biasing device. The duplicate complementary biasing devices are such that the current through these devices is identical and equal to the reference current. A replication feedback loop coupled to both the common connected node of the complementary output devices and the common connected node of the complementary biasing devices operates to make the voltage at these two nodes substantially identical. In this way, the current in the output devices is substantially equal in amplitude independent of the output voltage.
摘要翻译： 一种电荷泵电路，包括电流源电路，用于保持源自上部电流源的电流基本上等于通过较低电流源的电流下降。 电流源电路包括可用于通过第一偏置晶体管限定参考电流的下参考电流源和可与其中的参考电流成比例的输出电流建立的复制器件。 提供了一种补充输出装置，用于产生上电流源以及重复的偏压装置。 重复的互补偏置装置使得通过这些装置的电流是相同的并且等于参考电流。 耦合到互补输出设备的公共连接节点和互补偏置器件的公共连接节点的复制反馈环路操作以使这两个节点处的电压基本相同。 以这种方式，输出装置中的电流在输出电压上基本相等。
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公开(公告)号：US06574462B1
公开(公告)日：2003-06-03
申请号：US09382512
申请日：1999-08-25
申请人： Jonathan R. Strange
发明人： Jonathan R. Strange
IPC分类号： H04Q732
CPC分类号： H03B21/02
摘要： A local oscillator apparatus is disclosed for use in radio frequency communication systems. The local oscillator apparatus comprises at least one mixer coupled to an oscillator input signal and to a feedback signal such that a local oscillator signal may be produced by fractional multiplication of the oscillator input signal. In an embodiment of the invention, the local oscillator apparatus includes a regenerative modulator comprising a pair of frequency dividers and a single side band mixer.
摘要翻译： 公开了用于射频通信系统的本地振荡器装置。 本地振荡器装置包括耦合到振荡器输入信号和反馈信号的至少一个混频器，使得可以通过振荡器输入信号的分数乘法产生本地振荡器信号。 在本发明的实施例中，本地振荡器装置包括一个再生调制器，该再生调制器包括一对分频器和一个单频带混频器。
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