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    • 5. 发明申请
    • Rf Transmitter With Compensation of Differential Path Delay
    • Rf差分路径延迟补偿的发射机
    • US20080242246A1
    • 2008-10-02
    • US11996329
    • 2006-07-26
    • Brian MinnisPaul A. Moore
    • Brian MinnisPaul A. Moore
    • H03F1/02
    • H03F1/0227H03F1/0205H03F1/32H03F3/24H03F2200/102H03F2200/336H03F2200/462H03F2200/504H03F2200/99
    • A transmitter has a power amplifier (40) to amplify an input signal having amplitude modulation, a supply voltage controller (10) to control a supply voltage of the power amplifier (40) according to the envelope, a sensor (R1) for sensing a modulation of a current drawn by the power amplifier (40), a delay detector (20) for detecting a delay of the controlled supply voltage relative to the sensed current, and a delay adjuster (30) for compensating the relative delay according to the detected delay. By sensing a current drawn, the delay detected can include any delay contributed by the power amplifier (40) up to that point, and yet avoid the more complex circuitry needed to derive the delay from an output of the power amplifier. Thus the distortion and out of band emissions caused by differential delays can be reduced more effectively.
    • 发射机具有放大具有幅度调制的输入信号的功率放大器(40),用于根据信封控制功率放大器(40)的电源电压的电源电压控制器(10),用于感测的传感器(R 1) 由功率放大器(40)所绘制的电流的调制,用于检测受控电源电压相对于感测电流的延迟的延迟检测器(20),以及用于根据所述延迟检测器 检测到延迟。 通过感测所绘制的电流,检测到的延迟可以包括功率放大器(40)直到那一点所贡献的任何延迟,并且还避免了从功率放大器的输出导出延迟所需的更复杂的电路。 因此,可以更有效地降低由差分延迟引起的失真和带外发射。
    • 8. 发明授权
    • Polyphase receivers
    • 多相接收器
    • US07092461B1
    • 2006-08-15
    • US09710830
    • 2000-11-13
    • Brian J. MinnisPaul A. Moore
    • Brian J. MinnisPaul A. Moore
    • H03D3/22H04L27/22
    • H03D3/008H03D7/165H03G7/001H04B1/30
    • A polyphase receiver comprises an RF front end (10 to 28) for receiving a wanted data signal modulated on a carrier signal and for producing quadrature related low IF signals, an image rejection filter formed by a polyphase filter (30) for filtering the quadrature related low IF signals, soft limiting means (36,38) for compressing the dynamic range of the filtered quadrature related IF signals and a signal demodulator (41) for recovering the data signal. The soft limiting means (36,38) has a characteristic which is substantially linear at signal levels 10 dB below a predetermined minimum wanted signal level, moves into compression for higher signal levels and hard limits at substantially 10 dB above the desired receiver sensitivity which avoids degrading the sensitivity of the receiver.
    • 多相接收机包括用于接收在载波信号上调制的有用数据信号并用于产生正交相关低IF信号的RF前端(10至28),由多相滤波器(30)形成的用于滤波正交相关 低IF信号,用于压缩滤波正交相关IF信号的动态范围的软限幅装置(36,38)和用于恢复数据信号的信号解调器(41)。 软限制装置(36,38)具有在预定的最小有用信号电平以下10dB的信号电平处基本上线性的特性,进入压缩以达到高于期望接收机灵敏度的基本上10dB的较高信号电平和硬限制,这避免了 降低接收机的灵敏度。