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    • 2. 发明申请
    • SPEAKER IMPEDANCE MEASUREMENT
    • 扬声器阻抗测量
    • WO2012004348A1
    • 2012-01-12
    • PCT/EP2011/061519
    • 2011-07-07
    • ST-ERICSSON SAGUANZIROLI, FedericoNILSSON, RobertPERNICI, SergioTHIMANSSON, Jan
    • GUANZIROLI, FedericoNILSSON, RobertPERNICI, SergioTHIMANSSON, Jan
    • H04R3/00H04R29/00
    • H04R29/001H03F3/04H03F21/00H04R3/00H04R2420/05H04R2499/11
    • An integrated circuit (112) for processing audio and voice signals in a telephone is disclosed. The integrated circuit comprises an audio output port having a first and a second output terminal (16a, 16b) for connection to a first and a second input terminal, respectively, of a speaker (5). The integrated circuit (112) further comprises an audio input port having a first and a second input terminal (18a, 18b) for connection to a first and a second output terminal of an audio input source. The integrated circuit (112) also comprises at least one audio output path (22,40) having a digital input port and an analog output port with at least one analog output terminal (24,42a). Furthermore, the integrated circuit comprises an audio input path (60) having an analog input port, comprising a first and a second input terminal (62a,62b), and a digital output port. Moreover, the integrated circuit (112) comprises a test impedance, such as a resistor, (R T ). In a measurement mode of the integrated circuit (112), one of the audio output paths is used, together with the audio input path (60) and the test impedance (R T ), for measuring an electrical impedance of the speaker (5). A related method of measuring said electrical impedance of the speaker (5) is also disclosed.
    • 公开了一种用于处理电话中的音频和语音信号的集成电路(112)。 集成电路包括具有分别连接到扬声器(5)的第一和第二输入端子的第一和第二输出端子(16a,16b)的音频输出端口。 集成电路(112)还包括具有用于连接到音频输入源的第一和第二输出端的第一和第二输入端(18a,18b)的音频输入端口。 集成电路(112)还包括具有数字输入端口的至少一个音频输出路径(22,40)和具有至少一个模拟输出端子(24,42a)的模拟输出端口。 此外,集成电路包括具有模拟输入端口的音频输入路径(60),包括第一和第二输入端子(62a,62b)和数字输出端口。 此外,集成电路(112)包括诸如电阻器(RT)的测试阻抗。 在集成电路(112)的测量模式中,音频输出路径之一与音频输入路径(60)和测试阻抗(RT)一起用于测量扬声器(5)的电阻抗。 还公开了一种测量扬声器(5)的电阻抗的相关方法。
    • 3. 发明申请
    • BIAS CURRENT MONITOR AND CONTROL MECHANISM FOR AMPLIFIERS
    • 放大器的偏置电流监测和控制机制
    • WO2011014849A3
    • 2011-06-23
    • PCT/US2010044033
    • 2010-07-30
    • QUALCOMM INCMARRA THOMAS DHADJICHRISTOS ARISTOTELEPLETCHER NATHAN M
    • MARRA THOMAS DHADJICHRISTOS ARISTOTELEPLETCHER NATHAN M
    • H03F1/30H03F3/189
    • H03F1/301H03F1/30H03F3/04H03F3/189
    • Techniques for monitoring and controlling bias current of amplifiers are described. In an exemplary design, an apparatus may include an amplifier and a bias circuit. The amplifier may include at least one transistor coupled to an inductor. The bias circuit may generate at least one bias voltage for the at least one transistor in the amplifier to obtain a target bias current for the amplifier. The bias circuit may generate the at least one bias voltage based on a voltage across the inductor in the amplifier, or a current through a current mirror formed with one of the at least one transistor in the amplifier, or a gate-to-source voltage of one of the at least one transistor in the amplifier, or a voltage in a replica circuit replicating the amplifier, or a current applied to the amplifier with a switched mode power supply disabled.
    • 描述了用于监视和控制放大器的偏置电流的技术。 在示例性设计中,装置可以包括放大器和偏置电路。 放大器可以包括耦合到电感器的至少一个晶体管。 偏置电路可以产生用于放大器中的至少一个晶体管的至少一个偏置电压以获得放大器的目标偏置电流。 偏置电路可基于放大器中的电感器两端的电压或通过与放大器中的至少一个晶体管中的一个晶体管形成的电流镜的电流或者栅极至源极电压来生成至少一个偏置电压 放大器中的至少一个晶体管中的一个晶体管的电压,或复制放大器的复制电路中的电压,或者禁用开关模式电源而施加于放大器的电流。