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11. 发明申请

WO2010071876A1 CLASS AB AMPLIFIER WITH RESISTIVE LEVEL-SHIFTING CIRCUITRY 审中-公开
标题翻译：具有电阻式电平转换电路的AB类放大器
公开(公告)号：WO2010071876A1
公开(公告)日：2010-06-24
申请号：PCT/US2009/068942
申请日：2009-12-21
申请人： QUALCOMM Incorporated , WANG, Cheng-Han , PAN, Tzu-Wang , BROCKENBROUGH, Roger
发明人： WANG, Cheng-Han , PAN, Tzu-Wang , BROCKENBROUGH, Roger
IPC分类号： H03F1/30 , H03F3/45
CPC分类号： H03F3/45183 , H03F1/307
摘要： A class AB amplifier with resistive level-shifting circuitry is described. In one exemplary design, the class AB amplifier includes an input stage, a resistive level-shifting stage, a class AB output stage, and a bias circuit. The input stage receives an input signal and provides a first drive signal. The resistive level-shifting stage receives the first drive signal and provides a second drive signal. The output stage receives the first and second drive signals and provides an output signal. The bias circuit generates a bias voltage for the resistive level-shifting stage to obtain a desired quiescent current for the output stage. In one exemplary design, the resistive level-shifting stage includes a transistor and a resistor. The transistor receives the bias voltage and provides the second drive signal. The resistor is coupled to the transistor and provides a voltage drop between the first and second drive signals.
摘要翻译：描述了具有阻性电平移位电路的AB类放大器。在一个示例性设计中，AB类放大器包括输入级，电阻电平转换级，AB类输出级和偏置电路。输入级接收输入信号并提供第一驱动信号。电阻电平转换级接收第一驱动信号并提供第二驱动信号。输出级接收第一和第二驱动信号并提供输出信号。偏置电路产生用于电阻电平移位级的偏置电压，以获得用于输出级的期望的静态电流。在一个示例性设计中，电阻电平移位级包括晶体管和电阻器。晶体管接收偏置电压并提供第二驱动信号。电阻器耦合到晶体管并且在第一和第二驱动信号之间提供电压降。

12. 发明申请

WO2010048233A1 TUNABLE FILTER WITH GAIN CONTROL CIRCUIT 审中-公开
标题翻译：带增益控制电路的滤波器
公开(公告)号：WO2010048233A1
公开(公告)日：2010-04-29
申请号：PCT/US2009/061386
申请日：2009-10-20
申请人： QUALCOMM INCORPORATED , WANG, Cheng-Han , PAN, Tzu-Wang
发明人： WANG, Cheng-Han , PAN, Tzu-Wang
IPC分类号： H03H11/12 , H03F3/45 , H04B1/10
CPC分类号： H03H11/1291 , H03H11/1256
摘要： An apparatus (200) includes a filter (220) and a gain control circuit (250). The filter (220) receives and filters an input signal and provides an output signal in a first mode and operates as part of an oscillator in a second mode. The gain control circuit (250) varies the amplitude of an oscillator signal from the filter (220) in the second mode, e.g., by adjusting at least one variable gain element within the filter (220) in the oscillator second mode to obtain a target amplitude and/or non rail- to-rail signal swing for the oscillator signal. The apparatus (200) may further include a bandwidth control circuit (280) to adjust the bandwidth of the filter (220) in the second mode. The bandwidth control circuit (280) receives the oscillator signal, determines a target oscillation frequency corresponding to a selected bandwidth for the filter, and adjusts at least one circuit element (312, 314, 316, 318, 322, 324) within the filter to obtain the target oscillation frequency.
摘要翻译：装置（200）包括滤波器（220）和增益控制电路（250）。滤波器（220）接收和滤波输入信号并提供处于第一模式的输出信号，并且在第二模式中作为振荡器的一部分进行操作。增益控制电路（250）在第二模式中改变来自滤波器（220）的振荡器信号的振幅，例如通过在振荡器第二模式中调整滤波器（220）内的至少一个可变增益元件以获得目标用于振荡器信号的振幅和/或非轨至轨信号摆幅。装置（200）还可以包括带宽控制电路（280），以在第二模式中调整滤波器（220）的带宽。带宽控制电路（280）接收振荡器信号，确定与滤波器的选定带宽相对应的目标振荡频率，并且调整滤波器内的至少一个电路元件（312,314,316,318,322,324）至获得目标振荡频率。

13. 发明申请

WO2010115153A1 FM RADIO FREQUENCY PLAN USING PROGRAMMABLE OUTPUT COUNTER 审中-公开
标题翻译：使用可编程输出计数器的FM无线电频率计划
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
申请人： QUALCOMM INCORPORATED , PAN, Tzu-wang , ZENG, Yi , LIN, I-hsinang , TRIKHA, Pushp, K. , DUNWORTH, Jeremy, D. , APTE, Rahul, A.
发明人： PAN, Tzu-wang , ZENG, Yi , LIN, I-hsinang , TRIKHA, Pushp, K. , DUNWORTH, Jeremy, D. , APTE, Rahul, A.
IPC分类号： H04B1/38 , H04B15/06
CPC分类号： H04B1/3805 , H04B15/06
摘要： 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.
摘要翻译：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。

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