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专利说明1.关于无线电话机发射功率的调整电路,它的发射部分有一个用来放大可变振幅交流电压信号的晶体管放大器,其特点是:晶体管放大器有一个双栅极场效应晶体管(8),在它的一个栅(7)上加入需放大的交流电压信号,而在另一个栅(35)上加入由控制装置(29)给出的控制直流电压(U_R),该电压的大小由加在控制装置输入端且与被放大的交流电压信号振幅有关的第一直流电压值和第二可调节的直流电压值之差来确定的。
Patent Description 1. A circuit for adjusting the transmission power of a radiotelephone, the transmitting portion of which has a transistor amplifier for amplifying a variable amplitude AC voltage signal, characterized in that the transistor amplifier has a double-gate field-effect transistor (8) , An ac voltage signal to be amplified is added to one of its gates (7), and a control dc voltage (U_R) given by the control means (29) is applied to the other gate (35), the magnitude of which is given by At the control input of the control device and corresponding to the difference between the first DC voltage value and the second adjustable DC voltage value relating to the amplitude of the amplified AC voltage signal.