| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly efficient class AB amplifier having high linearity over a wide band. <P>SOLUTION: In the class AB amplifier where the power supply voltage is Vdc, and the angle of current flow θo of an amplifier element having a maximum current of Imax is between π (rad) and 2π (rad), the load impedance Z1 of basic wave when viewed from a slave current source in the equivalent circuit of the amplifier element is represented by Z1=R1+jX1, and the load impedance Z2 of the second harmonic is represented by Z2=R2+jX2. The X1 and R1 satisfy a relation -R1≤X1≤R1, and the R1 and X2/X1 are set to satisfy the relations R1=Vdc/Imax×πä1-cos(θo/2)}/äθo/2-sin(θo)/2} and X2/X1=-äθo/2-sin(θo)/2}/äsin(θo/2)-sin(1.5θo)/3}, respectively, or in the vicinity thereof. <P>COPYRIGHT: (C)2012,JPO&INPIT |
