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    • 10. 发明授权
    • Power control circuit for transmission apparatus
    • 传动装置功率控制电路
    • US06038428A
    • 2000-03-14
    • US636411
    • 1996-04-23
    • Nishiki MizusawaTsutomu Sato
    • Nishiki MizusawaTsutomu Sato
    • H03C1/00H03G1/02H03G3/30H03G5/16H04B1/04H01Q11/12
    • H03G3/3042
    • A modulated signal from an orthogonal modulator is supplied to a mixer, and a second local oscillating signal from a second local oscillator is supplied through a variable gain amplifier to the mixer. A transmission signal from the mixer is supplied through a step-attenuator (ATT) to a power amplifier, and further supplied through a directional coupler and an isolator to an antenna. A signal from the directional coupler is supplied through a detector to a comparator, and a reference voltage from a reference voltage setting unit is supplied to the comparator. An output from the comparator is supplied to a control unit of the variable gain amplifier and a gain is thereby controlled such that a DC voltage from the detector and the reference voltage from the reference voltage setting unit become equal to each other. Further, an attenuation amount of the step-attenuator is set by an attenuation amount setting unit in accordance with a transmission output control signal from a base station.
    • 来自正交调制器的调制信号被提供给混频器,并且来自第二本地振荡器的第二本地振荡信号通过可变增益放大器提供给混频器。 来自混频器的发送信号通过步进衰减器(ATT)提供给功率放大器,并且还通过定向耦合器和隔离器提供给天线。 来自定向耦合器的信号通过检测器提供给比较器,并且来自参考电压设置单元的参考电压被提供给比较器。 比较器的输出被提供给可变增益放大器的控制单元,从而控制增益,使得来自检测器的直流电压和参考电压设定单元的参考电压变得彼此相等。 此外,根据来自基站的发送输出控制信号,通过衰减量设定单元来设定步进衰减器的衰减量。