公开(公告)号：US08355752B2

公开(公告)日：2013-01-15

申请号：US12610600

申请日：2009-11-02

申请人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

发明人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H04M1/00 ,  H04B1/16 ,  H04B7/00 ,  H04B1/10

CPC分类号： H04B1/1036 ,  H04B1/14 ,  H04B1/3805 ,  H04B15/04

摘要： A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.

摘要翻译： 蜂窝电话包括蜂窝电话电路和FM接收机。 接收的FM信号由混频器下变频。 处理下变频信号以产生提供给数字IF滤波器的FM信号。 如果使用蜂窝电话线路发射的阻塞器将干扰由于LO谐波与阻塞器的相互作用而导致的FM信号的接收，如果使用常规LO频率，则使用不同的LO频率。 下变频FM信号的后续处理（例如，通过数字复共轭选择器和IF旋转器）导致提供给数字IF滤波器的信号具有与数字IF滤波器相同的中心频率，尽管使用不同的LO频率 。 在一些实施例中，根据蜂窝电话模式和FM信号，LO偏移不同的量。

公开(公告)号：US20110009161A1

公开(公告)日：2011-01-13

申请号：US12610600

申请日：2009-11-02

申请人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

发明人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H04W92/02

CPC分类号： H04B1/1036 ,  H04B1/14 ,  H04B1/3805 ,  H04B15/04

摘要： A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.

摘要翻译： 蜂窝电话包括蜂窝电话电路和FM接收机。 接收的FM信号由混频器下变频。 处理下变频信号以产生提供给数字IF滤波器的FM信号。 如果使用蜂窝电话线路发射的阻塞器将干扰由于LO谐波与阻塞器的相互作用而导致的FM信号的接收，如果使用常规LO频率，则使用不同的LO频率。 下变频FM信号的后续处理（例如，通过数字复共轭选择器和IF旋转器）导致提供给数字IF滤波器的信号具有与数字IF滤波器相同的中心频率，尽管使用不同的LO频率 。 在一些实施例中，根据蜂窝电话模式和FM信号，LO偏移不同的量。

公开(公告)号：US20100330941A1

公开(公告)日：2010-12-30

申请号：US12492407

申请日：2009-06-26

申请人： Pushp Trikha ,  Tzu-wang Pan ,  Eugene Yang ,  Yi Zeng ,  I-Hsiang Lin ,  Tg Vishwanath

发明人： Pushp Trikha ,  Tzu-wang Pan ,  Eugene Yang ,  Yi Zeng ,  I-Hsiang Lin ,  Tg Vishwanath

IPC分类号： H04B1/18

CPC分类号： H04H20/57 ,  H04H40/45

摘要： A frequency modulation (FM) transmitter implemented with a delta-sigma modulator and a phase-locked loop (PLL) is described. The delta-sigma modulator receives a modulating signal (e.g., an FM stereo multiplex (MPX) signal) and provides a modulator output signal. The PLL performs frequency modulation based on the modulator output signal and provides an FM signal. The FM transmitter may further include a gain/phase compensation unit and a scaling unit. The compensation unit may compensate the modulating signal for the closed-loop response of the PLL. The scaling unit may scale the amplitude of the modulating signal based on a gain to obtain a target frequency deviation for the FM signal. The PLL may operate in a transmit mode or a receive mode, may perform frequency modulation in the transmit mode, and may provide a local oscillator (LO) signal at a fixed frequency in the receive mode.

摘要翻译： 描述了用Δ-Σ调制器和锁相环（PLL）实现的频率调制（FM）发射机。 Δ-Σ调制器接收调制信号（例如，FM立体声多路复用（MPX）信号），并提供调制器输出信号。 PLL根据调制器输出信号进行调频，并提供FM信号。 FM发射机还可以包括增益/相位补偿单元和缩放单元。 补偿单元可以补偿PLL的闭环响应的调制信号。 缩放单元可以基于增益来调整调制信号的幅度，以获得FM信号的目标频率偏差。 PLL可以以发送模式或接收模式工作，可以在发送模式下执行频率调制，并且可以在接收模式下以固定频率提供本地振荡器（LO）信号。

公开(公告)号：US08437721B2

公开(公告)日：2013-05-07

申请号：US12430106

申请日：2009-04-26

申请人： Yi Zeng ,  Tzu-wang Pan ,  I-Hsiang Lin ,  Jeremy Dunworth ,  Pushp Trikha ,  Rahul Apte

发明人： Yi Zeng ,  Tzu-wang Pan ,  I-Hsiang Lin ,  Jeremy Dunworth ,  Pushp Trikha ,  Rahul Apte

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H04B1/1027

摘要： A frequency synthesizer within an FM receiver employs a Phase-Locked Loop (PLL) to generate a Local Oscillator (LO) signal. The LO signal is supplied to a mixer. The FM receiver also includes jammer detection functionality. If no jammer is detected, then the loop bandwidth of the PLL is set to have a relatively high value, thereby favoring suppression of in-band residual FM. If a jammer is detected, then the loop bandwidth of the PLL is set to have a relatively low value, thereby favoring suppression of out-of-band SSB phase noise. By adaptively changing loop bandwidth depending on whether a jammer is detected, performance requirements on sub-circuits within the PLL can be relaxed while still satisfying in-band residual FM and out-of-band SSB phase noise requirements. By allowing the VCO of the PLL to generate more phase noise due to the adaptive changing of loop bandwidth, VCO power consumption can be reduced.

摘要翻译： FM接收机内的频率合成器采用锁相环（PLL）来产生本地振荡器（LO）信号。 LO信号提供给混频器。 FM接收机还包括干扰检测功能。 如果没有检测到干扰，则PLL的环路带宽被设置为具有相对较高的值，从而有利于抑制带内剩余FM。 如果检测到干扰，则将PLL的环路带宽设置为具有相对较低的值，从而有利于抑制带外SSB相位噪声。 通过根据是否检测到干扰信号来自适应地改变环路带宽，可以放宽PLL内的子电路的性能要求，同时仍然满足带内剩余FM和带外SSB相位噪声要求。 通过允许PLL的VCO由于环路带宽的自适应变化而产生更多的相位噪声，可以降低VCO的功耗。

公开(公告)号：US08442466B2

公开(公告)日：2013-05-14

申请号：US12492407

申请日：2009-06-26

申请人： Pushp Trikha ,  Tzu-wang Pan ,  Eugene Yang ,  Yi Zeng ,  I-Hsiang Lin ,  Tg Vishwanath

发明人： Pushp Trikha ,  Tzu-wang Pan ,  Eugene Yang ,  Yi Zeng ,  I-Hsiang Lin ,  Tg Vishwanath

IPC分类号： H04B1/06 ,  H04B7/00

CPC分类号： H04H20/57 ,  H04H40/45

摘要： A frequency modulation (FM) transmitter implemented with a delta-sigma modulator and a phase-locked loop (PLL) is described. The delta-sigma modulator receives a modulating signal (e.g., an FM stereo multiplex (MPX) signal) and provides a modulator output signal. The PLL performs frequency modulation based on the modulator output signal and provides an FM signal. The FM transmitter may further include a gain/phase compensation unit and a scaling unit. The compensation unit may compensate the modulating signal for the closed-loop response of the PLL. The scaling unit may scale the amplitude of the modulating signal based on a gain to obtain a target frequency deviation for the FM signal. The PLL may operate in a transmit mode or a receive mode, may perform frequency modulation in the transmit mode, and may provide a local oscillator (LO) signal at a fixed frequency in the receive mode.

摘要翻译： 描述了用Δ-Σ调制器和锁相环（PLL）实现的频率调制（FM）发射机。 Δ-Σ调制器接收调制信号（例如，FM立体声多路复用（MPX）信号），并提供调制器输出信号。 PLL根据调制器输出信号进行调频，并提供FM信号。 FM发射机还可以包括增益/相位补偿单元和缩放单元。 补偿单元可以补偿PLL的闭环响应的调制信号。 缩放单元可以基于增益来调整调制信号的幅度，以获得FM信号的目标频率偏差。 PLL可以以发送模式或接收模式工作，可以在发送模式下执行频率调制，并且可以在接收模式下以固定频率提供本地振荡器（LO）信号。

公开(公告)号：US20100273442A1

公开(公告)日：2010-10-28

申请号：US12430106

申请日：2009-04-26

申请人： Yi Zeng ,  Tzu-wang Pan ,  I-Hsiang Lin ,  Jeremy Dunworth ,  Pushp Trikha ,  Rahul Apte

发明人： Yi Zeng ,  Tzu-wang Pan ,  I-Hsiang Lin ,  Jeremy Dunworth ,  Pushp Trikha ,  Rahul Apte

IPC分类号： H04B1/16

CPC分类号： H04B1/1027

摘要： A frequency synthesizer within an FM receiver employs a Phase-Locked Loop (PLL) to generate a Local Oscillator (LO) signal. The LO signal is supplied to a mixer. The FM receiver also includes jammer detection functionality. If no jammer is detected, then the loop bandwidth of the PLL is set to have a relatively high value, thereby favoring suppression of in-band residual FM. If a jammer is detected, then the loop bandwidth of the PLL is set to have a relatively low value, thereby favoring suppression of out-of-band SSB phase noise. By adaptively changing loop bandwidth depending on whether a jammer is detected, performance requirements on sub-circuits within the PLL can be relaxed while still satisfying in-band residual FM and out-of-band SSB phase noise requirements. By allowing the VCO of the PLL to generate more phase noise due to the adaptive changing of loop bandwidth, VCO power consumption can be reduced.

摘要翻译： FM接收机内的频率合成器采用锁相环（PLL）来产生本地振荡器（LO）信号。 LO信号提供给混频器。 FM接收机还包括干扰检测功能。 如果没有检测到干扰，则PLL的环路带宽被设置为具有相对较高的值，从而有利于抑制带内剩余FM。 如果检测到干扰，则将PLL的环路带宽设置为具有相对较低的值，从而有利于抑制带外SSB相位噪声。 通过根据是否检测到干扰信号来自适应地改变环路带宽，可以放宽PLL内的子电路的性能要求，同时仍然满足带内剩余FM和带外SSB相位噪声要求。 通过允许PLL的VCO由于环路带宽的自适应变化而产生更多的相位噪声，可以降低VCO的功耗。