CLASS-E AMPLIFIER AND EER MODULATION AMPLIFIER DEVICE

摘要

PPROBLEM TO BE SOLVED: To provide a class-E amplifier for preventing deterioration in efficiency due to the fluctuation in the power source voltage, by controlling the rise time/fall time at switching of a transistor for amplification, in response to fluctuation of a power source voltage. PSOLUTION: A high-frequency input signal, inputted from an input signal generator 5, is amplified by a transistor 4 forming the class E amplifier and supplied to a load R6. In this case, a power source voltage detecting unit 1 detects the voltage level of a power source voltage Vdd and supplies it to a control unit 2. A control unit 2 generates a control signal, corresponding to the voltage level of the power source voltage Vdd and causes the control signal to vary the capacity value of a variable capacitance Cp3. Thus, since the capacitance value of the variable capacitance Cp3 changes, according to the variation of the power source voltage Vdd, the rise time/fall time by switching of the transistor 4 can be controlled according to the power source voltage. PCOPYRIGHT: (C)2006,JPO&NCIPI