公开(公告)号：WO2013090849A1

公开(公告)日：2013-06-20

申请号：PCT/US2012/069946

申请日：2012-12-14

Applicant: QUALCOMM INCORPORATED

Inventor： SHAH, Peter J. ,  MEHRABI, Arash

IPC: H03F1/52 ,  H03F3/30

CPC classification number: H03F1/523 ,  H03F3/187 ,  H03F3/3022 ,  H03F2200/426 ,  H03F2200/453 ,  H03F2200/456 ,  H03F2200/474 ,  H04R3/007 ,  H04R29/001

Abstract: Techniques for determining the impedance of a load coupled to an amplifier. In an exemplary embodiment, a mirroring transistor is provided to mirror the current through a transistor of the amplifier output stage to a predetermined ratio. The impedance of the load may be calculated based on the mirrored current and the amplifier output voltage provided to the load. In an exemplary embodiment, the mirrored current may be digitized and provided to a digital load impedance calculation block, which estimates the load impedance based on the digitized current and an indication of the amplifier output voltage. Further techniques are described for calibrating the load impedance calculation scheme, and for differentiating between stereo and mono audio plugs using said techniques.

Abstract translation: 用于确定耦合到放大器的负载的阻抗的技术。 在示例性实施例中，提供镜像晶体管以将通过放大器输出级的晶体管的电流镜像到预定比率。 可以根据提供给负载的镜像电流和放大器输出电压来计算负载的阻抗。 在示例性实施例中，镜像电流可以被数字化并提供给数字负载阻抗计算块，其基于数字化电流和放大器输出电压的指示来估计负载阻抗。 描述了用于校准负载阻抗计算方案以及使用所述技术区分立体声和单声道音频插头的其它技术。

公开(公告)号：WO2012170582A3

公开(公告)日：2012-12-13

申请号：PCT/US2012/041170

申请日：2012-06-06

Applicant: QUALCOMM Incorporated ,  SHAH, Peter J. ,  TALEIE, Shahin Mehdizad ,  GROENEWOLD, Gerrit ,  MIAO, Guoqing ,  SUNG, Eunyung

Inventor： SHAH, Peter J. ,  TALEIE, Shahin Mehdizad ,  GROENEWOLD, Gerrit ,  MIAO, Guoqing ,  SUNG, Eunyung

IPC: H03F3/00 ,  H03F3/45

Abstract: A switched-capacitor DC blocking amplifier is disclosed. In an embodiment, an integrated circuit is provided that includes an amplifier having an amplifier input and an amplifier output, a capacitor connected to the amplifier input and configured to receive an input signal, and a switched capacitor circuit coupled to provide a resistance between the amplifier input and the amplifier output. In one implementation, the switched capacitor circuit is configured with a feed forward circuit to reduce aliasing. In another implementation, the switched capacitor circuit includes a switched impedance circuit to reduce noise.

公开(公告)号：WO2014100520A1

公开(公告)日：2014-06-26

申请号：PCT/US2013/076759

申请日：2013-12-19

Applicant: QUALCOMM INCORPORATED

Inventor： QUAN, Xiaohong ,  SHAH, Peter J. ,  SRIVASTAVA, Ankit ,  MIAO, Guoqing

IPC: H04R29/00

CPC classification number: H04R3/007 ,  H04R29/001

Abstract: Techniques for sensing the resistance of a load. In an aspect, a sense resistor is provided in series with the load. Each terminal of the sense resistor is alternately coupled via switches to a sense amplifier. A second input of the sense resistor is coupled to a terminal of the load. The voltage drop across the load and the voltage drop across the load plus sense resistor are alternatively measured. These voltage drops may be digitized and used to compute a resistance of the load using, e.g., a digital processor.

Abstract translation: 用于感测负载电阻的技术。 在一方面，与负载串联提供感测电阻器。 检测电阻器的每个端子通过开关交替耦合到读出放大器。 检测电阻的第二输入耦合到负载的端子。 交替地测量负载上的电压降和负载+检测电阻两端的电压降。 这些电压降可以被数字化并且用于使用例如数字处理器来计算负载的电阻。

公开(公告)号：WO2013130899A1

公开(公告)日：2013-09-06

申请号：PCT/US2013/028446

申请日：2013-02-28

Applicant: QUALCOMM INCORPORATED

Inventor： SRIVASTAVA, Ankit ,  SIENKO, Matthew D. ,  AZIN, Meysam ,  QUAN, Xiaohong ,  SHAH, Peter J.

IPC: H03F3/217 ,  H03F1/52 ,  H03F3/45

CPC classification number: H03F3/2173 ,  H03F1/523 ,  H03F3/45179 ,  H03F3/45183 ,  H03F3/45475 ,  H03F2200/426 ,  H03F2200/462 ,  H03F2200/471 ,  H03F2200/481 ,  H03F2203/45522 ,  H03F2203/45526

Abstract: Techniques for sensing current delivered to a load by a differential output stage, e.g., in a Class D amplifier. In one aspect, voltages across sense resistors (120, 122) coupled in series with first and second branches of the differential output stage are low-passed filtered (130) and digitized (140). The sense resistors (120,122) may be coupled in series with the sources of transistors (103, 108) of the first and second branches, wherein the transistors (103, 108) are selectively switchable on and off by input driving voltages (Vin, Vip). The input driving voltages (Vin, Vip) may correspond to a ternary voltage waveform such that during a given phase, the two transistors (103, 108) coupled in series with the sense resistors (120, 122) may be turned off. Further aspects provide for having cascoded transistors, and the sense resistors being provided between a pair of cascoded transistors.

Abstract translation: 用于感测由差分输出级（例如D类放大器）传送到负载的电流的技术。 在一个方面，与差分输出级的第一和第二分支串联耦合的感测电阻器（120,122）之间的电压被低通滤波（130）并数字化（140）。 检测电阻器（120,122）可以与第一和第二分支的晶体管（103,108）的源极串联耦合，其中晶体管（103,108）可以通过输入驱动电压（Vin，Vip）被选择性地切换 ）。 输入驱动电压（Vin，Vip）可以对应于三态电压波形，使得在给定相位期间，与感测电阻器（120,122）串联耦合的两个晶体管（103,108）可能被关断。 另外的方面提供了具有级联的晶体管，并且感测电阻器被提供在一对级联晶体管之间。

公开(公告)号：WO2013090934A1

公开(公告)日：2013-06-20

申请号：PCT/US2012/070193

申请日：2012-12-17

Applicant: QUALCOMM INCORPORATED

Inventor： SHAH, Peter J. ,  MEHRABI, Arash

IPC: G01R31/04 ,  H04M1/725 ,  H04R5/04

CPC classification number: H04R5/04 ,  G01R31/041 ,  G01R31/043 ,  H04R1/1033 ,  H04R2420/09

Abstract: Techniques for detecting the type of a media plug inserted into a corresponding jack. In an exemplary embodiment, the output of a first power amplifier for driving a media plug terminal, e.g., the right headphone or left headphone, is selectively coupled to a reference voltage. Measurements of the voltage at a microphone terminal of the media plug may be alternately made for the reference voltage being at a first value and a second value. In an embodiment, the first power amplifier output voltage may be varied by opening or closing a switch. Alternatively, the first power amplifier output voltage may be directly set by an input voltage to the first power amplifier. By detecting changes in the voltages measured at the microphone terminal, it may be determined whether the media plug is of a North American type or European type.

Abstract translation: 用于检测插入相应插孔中的介质插头类型的技术。 在示例性实施例中，用于驱动媒体插头终端（例如右耳机或左耳机）的第一功率放大器的输出被选择性地耦合到参考电压。 介质插头的麦克风端子处的电压的测量可以交替地使参考电压处于第一值和第二值。 在一个实施例中，可以通过打开或关闭开关来改变第一功率放大器输出电压。 或者，第一功率放大器输出电压可以通过对第一功率放大器的输入电压直接设置。 通过检测在麦克风端子测量的电压的变化，可以确定介质插头是北美型还是欧式。

公开(公告)号：WO2013152332A1

公开(公告)日：2013-10-10

申请号：PCT/US2013/035522

申请日：2013-04-05

Applicant: QUALCOMM INCORPORATED

Inventor： MIAO, Guoqing ,  SHAH, Peter J.

IPC: H04R1/10 ,  H04R5/04

CPC classification number: H04R1/1041 ,  H04R5/04 ,  H04R2420/05 ,  H04R2420/09

Abstract: Techniques for utilizing a plurality of switches to reduce crosstalk in a headset jack for accommodating both European and North American type headset plugs. In an aspect, a six-switch solution is provided to selectively couple first and second terminals of the jack to a ground and a microphone terminal, and further to selectively couple a ground sensing input to the first or second terminal of the jack. The ground sensing input is provided to left and right audio channel amplifiers for driving the corresponding left and right terminals of the headset, to provide a common-mode reference level to the left and right audio channel amplifiers. In another aspect, at least four physical pins are provided to couple the switches to the ground and microphone terminals of the jack, and the connections between the ground sensing inputs and the jack may be provided adjacent to the jack for better isolation.

Abstract translation: 用于利用多个开关以降低用于容纳欧洲和北美型耳机插头的耳机插孔中的串扰的技术。 在一方面，提供六开关解决方案以选择性地将插座的第一和第二端子耦合到地和麦克风端子，并且进一步选择性地将接地感测输入端耦合到插座的第一或第二端子。 地面感测输入被提供给用于驱动耳机的相应左和右端子的左和右音频通道放大器，以向左和右声道放大器提供共模参考电平。 在另一方面，提供至少四个物理引脚以将开关耦合到插座的接地和麦克风端子，并且接地感测输入端和插座之间的连接可以邻近插座设置以更好地隔离。