公开(公告)号：WO2010151890A1

公开(公告)日：2010-12-29

申请号：PCT/US2010/040247

申请日：2010-06-28

Applicant: QUALCOMM Incorporated ,  TRIKHA, Pushp K. ,  PAN, Tzu-wang ,  YANG, Eugene ,  ZENG, Yi ,  LIN, I-Hsiang ,  VISHWANATH, Tg

Inventor： TRIKHA, Pushp K. ,  PAN, Tzu-wang ,  YANG, Eugene ,  ZENG, Yi ,  LIN, I-Hsiang ,  VISHWANATH, Tg

IPC: H04H20/57 ,  H04B1/40 ,  H04H40/45

CPC classification number: H04H20/57 ,  H04H40/45

Abstract: 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.

Abstract translation: 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：WO2010115153A1

公开(公告)日：2010-10-07

申请号：PCT/US2010/029853

申请日：2010-04-02

Applicant: QUALCOMM INCORPORATED ,  PAN, Tzu-wang ,  ZENG, Yi ,  LIN, I-hsinang ,  TRIKHA, Pushp, K. ,  DUNWORTH, Jeremy, D. ,  APTE, Rahul, A.

Inventor： PAN, Tzu-wang ,  ZENG, Yi ,  LIN, I-hsinang ,  TRIKHA, Pushp, K. ,  DUNWORTH, Jeremy, D. ,  APTE, Rahul, A.

IPC: H04B1/38 ,  H04B15/06

CPC classification number: H04B1/3805 ,  H04B15/06

Abstract: An FM radio with a wide frequency range operates in a cell phone without interfering with the VCO of the RF transceiver. The FM transceiver generates a VCO signal whose frequency varies by less than ±7% from the midpoint of a narrow first range. A synthesizer signal is generated by dividing the VCO frequency by a first divisor such that the synthesizer frequency varies over a lower frequency second range. The VCO frequency is also divided by a second divisor such that the synthesizer frequency varies over a third range. The upper limit of the second range falls at the lower limit of the third range. The lower limit of the second range is 85.5 MHz and the upper limit of the third range is 108.0 MHz. By also using a third divisor, a synthesizer signal with a range of 76-108 MHz is generated from the narrow first frequency range.

Abstract translation: 具有宽频率范围的FM收音机在手机中工作，而不会干扰RF收发器的VCO。 FM收发器产生一个VCO信号，其频率从窄的第一范围的中点变化小于±7％。 通过将VCO频率除以第一因子来产生合成器信号，使得合成器频率在较低频率的第二范围内变化。 VCO频率也被第二除数除以使得合成器频率在第三范围内变化。 第二范围的上限落在第三范围的下限。 第二范围的下限为85.5MHz，第三范围的上限为108.0MHz。 通过使用第三除数，从窄的第一频率范围产生具有76-108MHz范围的合成器信号。

公开(公告)号：WO2011006014A1

公开(公告)日：2011-01-13

申请号：PCT/US2010/041435

申请日：2010-07-08

Applicant: QUALCOMM INCORPORATED ,  TRIKHA, Pushp, K. ,  BLESSENT, Luca ,  LI, Xiaoyong ,  APTE, Rahul, A.

Inventor： TRIKHA, Pushp, K. ,  BLESSENT, Luca ,  LI, Xiaoyong ,  APTE, Rahul, A.

IPC: H04B1/10 ,  H04B1/14 ,  H04B1/38 ,  H04B15/04

CPC classification number: H04B1/1036 ,  H04B1/14 ,  H04B1/3805 ,  H04B15/04

Abstract: 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.

Abstract translation: 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。