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    • 3. 发明公开
    • 전계 효과 트랜지스터의 바이어스 회로
    • FET偏置电路
    • KR1020010085355A
    • 2001-09-07
    • KR1020010006185
    • 2001-02-08
    • 일본무선주식회사
    • 사카모토,히로노리혼다,타마키타카하시,타케토
    • H03F1/30
    • H03F1/306H03F2200/447H03F2200/75
    • PURPOSE: To prevent a bias point from fluctuating on gate current fluctuation caused by an input signal level or temperature change and further to operate an FET in all A, AB and B classes. CONSTITUTION: A gate bias voltage Vgsdc of the FET is compared with a reference voltage by an operational amplifier A and closed loop control is applied to the gate bias voltage Vgsdc of the FET by the output of the operational amplifier A. The temperature characteristics of the mutual conductance of the FET are compensated by setting the temperature characteristics of one of or both resistors R1 and R2. The fluctuation of a drain bias current Idsdc caused by the input signal level and temperature change can be suppressed. Since a gate circuit and a drain circuit are separated, the circuit can be operated in all the A, AB and B classes. Since a voltage drop caused by resistor Rg can be neglected, the design or the like of the resistor Rg regarding the stability of high frequency characteristics preferential is enabled.
    • 目的:防止偏置点在输入信号电平或温度变化引起的栅极电流波动上波动,并进一步在所有A,AB和B类中操作FET。 构成:通过运算放大器A将FET的栅极偏置电压Vgsdc与参考电压进行比较,并通过运算放大器A的输出对FET的栅极偏置电压Vgsdc施加闭环控制。温度特性 通过设置电阻R1和R2中的一个或两个的温度特性来补偿FET的互导。 可以抑制由输入信号电平和温度变化引起的漏极偏置电流Idsdc的波动。 由于门电路和漏极电路分离,电路可以在所有A,AB和B类中工作。 由于可以忽略由电阻器Rg引起的电压降,所以能够实现关于高频特性优先的稳定性的电阻器Rg的设计等。
    • 4. 发明公开
    • 피드 포워드 증폭기 및 그 제어기
    • 前置放大器及其控制电路
    • KR1020010062168A
    • 2001-07-07
    • KR1020000073756
    • 2000-12-06
    • 일본무선주식회사
    • 야마시타,카즈오이토,아키라사카모토,히로노리이토,케이지로야마다,아키라카와수미,노리히사
    • H03F1/32
    • H03F1/3235
    • PURPOSE: To improve a distortion component removing and suppressing effect in simple circuit configuration and to shorten time required for establishing an optimal control state. CONSTITUTION: By inputting a basic pilot signal outputted from an oscillation circuit 20 and a local oscillation signal outputted from an oscillation circuit 21 to an injection side mixer 22, two kinds of second pilot signals of a sum frequency and a difference frequency are generated and injected. One part of a signal, which appears at an output terminal 2, is branched, the frequency thereof is converted by a detection side mixer 23 while using the same local oscillation signal, the signal is filtered by a narrow band filter 24, the filtered output is inputted to a synchronous detection circuit 25 as error signals ErrI and ErrQ, and is synchronously detected while referring to the basic pilot signal so that a control signal corresponding to a distortion removal loop can be generated. The spectrum of the second pilot signal can be spread as well. On the detection side, processing for canceling the input signal component can be performed as well.
    • 目的:提高简单电路配置中的失真成分去除和抑制效果,缩短建立最佳控制状态所需的时间。 构成:通过将从振荡电路20输出的基本导频信号和从振荡电路21输出的本地振荡信号输入到注入侧混频器22,生成和注入和频和频差的两种第二导频信号 。 出现在输出端子2处的信号的一部分被分支,其频率由检测侧混频器23转换,同时使用相同的本地振荡信号,该信号被窄带滤波器24滤波,滤波后的输出 被输入到同步检测电路25作为误差信号ErrI和ErrQ,并且参考基本导频信号同步检测,从而可以产生对应于失真消除环路的控制信号。 第二导频信号的频谱也可以扩展。 在检测侧,也可以执行用于抵消输入信号分量的处理。