| 摘要 |
In this Doherty amplifier circuit, the actuation mode switches between the first amplification mode and the second amplification mode according to the strength of the input signal. This Doherty amplifier circuit is provided with an input unit, a first amplifier, a second amplifier, a first matching circuit, an output unit, and a second matching circuit. The input unit divides the input signal into two. The first amplifier amplifies one of the input signals in the first amplification mode, and is in a saturated output state in the second amplification mode. The second amplifier is in an off state in the first amplification mode, and amplifies the other input signal in the second amplification mode. The first matching circuit is connected to the stage subsequent to the first amplifier. The output unit is connected to the stage subsequent to the first matching circuit. The second matching circuit is connected to the stage subsequent to the second amplifier. The output unit is connected to the stage subsequent to the second matching circuit, and provided with a wire that is shorter than a quarter of the wavelength of the input signal. The first matching circuit is provided with at least four independent parameters adjusted in terms of design so as to satisfy the output impedance matching, both in the first amplification mode and in the second amplification mode. |
