Automatically adjusting low noise amplifier
    2.
    发明授权
    Automatically adjusting low noise amplifier 有权
    自动调节低噪声放大器

    公开(公告)号:US07081791B2

    公开(公告)日:2006-07-25

    申请号:US10820675

    申请日:2004-04-07

    Abstract: A low noise amplifier circuit (10) includes an attenuator (12) for receiving a calibration signal and generating an attenuated calibration signal. A low noise amplifier (14) amplifies the attenuated calibration signal in calibration mode or amplifies a functional signal in functional mode. In calibration mode, a envelope detector/comparator (16) compares the calibration signal with the output of the low noise amplifier and generates a compensation signal indicating a deviation between the two signals. The gain of the low noise amplifier is adjusted responsive to the compensation signal.

    Abstract translation: 低噪声放大器电路(10)包括用于接收校准信号并产生衰减的校准信号的衰减器(12)。 低噪声放大器(14)在校准模式下放大衰减的校准信号,或者在功能模式下放大功能信号。 在校准模式中,包络检测器/比较器(16)将校准信号与低噪声放大器的输出进行比较,并产生指示两个信号之间的偏差的补偿信号。 响应补偿信号调整低噪声放大器的增益。

    Radio frequency modulator
    4.
    发明授权
    Radio frequency modulator 有权
    射频调制器

    公开(公告)号:US07136626B2

    公开(公告)日:2006-11-14

    申请号:US10071919

    申请日:2002-02-08

    CPC classification number: H03C3/0983 H03C3/0966

    Abstract: A transmitter architecture (200) provides for a stable and low noise modulator where the modulation bandwidth is uncorrelated to the TX loop bandwidth. The output signal (228) of the TX loop is demodulated by a demodulator (208) and the demodulated signal is compared by a comparator (206) with the modulating input signal (202). The output of the comparator is then used to adjust a digital pre-emphasis filter (204) which preconditions the modulating input signal (202) in the digital domain. The preconditioning approach of the present invention provides for low noise because the transmitter designer can chose a narrow band for the TX loop which will also filter out the noise coming from the additional synthesizer (226) used to down convert the input signal.

    Abstract translation: 发射机架构(200)提供稳定和低噪声调制器,其中调制带宽与TX环路带宽不相关。 TX环路的输出信号(228)由解调器(208)解调,并且解调信号由比较器(206)与调制输入信号(202)进行比较。 然后比较器的输出用于调整预编码数字域中的调制输入信号(202)的数字预加重滤波器(204)。 本发明的预处理方法提供低噪声,因为发射机设计者可以为TX环路选择窄带,其也将滤除来自用于下变频输入信号的附加合成器(226)的噪声。

    Differential amplifier having a double differential amplifier pair with
interconnected control electrodes
    7.
    发明授权
    Differential amplifier having a double differential amplifier pair with interconnected control electrodes 失效
    具有互连控制电极的双差分放大器对的差分放大器

    公开(公告)号:US5625318A

    公开(公告)日:1997-04-29

    申请号:US541904

    申请日:1995-10-10

    CPC classification number: H03H11/22

    Abstract: A tunable quadrature phase shifter including two branches each constituted by the cascade connection of a filter, an amplifier and a summing circuit, and two cross-connections constituted by amplifiers interconnecting the filter of one branch to the summing circuit of the opposite branch. An accurate 90 degrees phase shift between the two output signals is obtained by controlling the tail currents of the four amplifiers. The phase shifter used in mobile telecommunication transceivers may be easily and accurately tuned because the signals used in the summing circuits all have a similar amplitude. It is further adapted to operate with only a 3 Volt battery supply as used in wireless phones. The bandwidth of the amplifiers is increased by using double differential pair amplifiers which behave as cascode arrangements.

    Abstract translation: 一个可调谐的正交移相器,包括两个分支,每个分支由滤波器,放大器和求和电路的级联连接构成,以及由一个分支的滤波器将相对分支的求和电路互连的放大器构成的两个交叉连接。 通过控制四个放大器的尾部电流,可以获得两个输出信号之间精确的90度相移。 用于移动电信收发机的移相器可以容易且准确地调谐,因为在求和电路中使用的信号都具有相似的幅度。 它还适用于仅使用无线电话中的3伏电池供电。 通过使用作为共源共栅布置的双差分对放大器来增加放大器的带宽。

    Automatically adjusting low noise amplifier
    10.
    发明申请
    Automatically adjusting low noise amplifier 有权
    自动调节低噪声放大器

    公开(公告)号:US20050073357A1

    公开(公告)日:2005-04-07

    申请号:US10820675

    申请日:2004-04-07

    Abstract: A low noise amplifier circuit (10) includes an attenuator (12) for receiving a calibration signal and generating an attenuated calibration signal. A low noise amplifier (14) amplifies the attenuated calibration signal in calibration mode or amplifies a functional signal in functional mode. In calibration mode, a envelope detector/comparator (16) compares the calibration signal with the output of the low noise amplifier and generates a compensation signal indicating a deviation between the two signals. The gain of the low noise amplifier is adjusted responsive to the compensation signal.

    Abstract translation: 低噪声放大器电路(10)包括用于接收校准信号并产生衰减的校准信号的衰减器(12)。 低噪声放大器(14)在校准模式下放大衰减的校准信号,或者在功能模式下放大功能信号。 在校准模式中,包络检测器/比较器(16)将校准信号与低噪声放大器的输出进行比较,并产生指示两个信号之间的偏差的补偿信号。 响应补偿信号调整低噪声放大器的增益。

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