Patent ID: 8253494

Claim:
A combination amplifier comprising: a combination amplifier input terminal; a combination amplifier output terminal; a carrier amplifier having a carrier amplifier input terminal and a carrier amplifier output terminal; a first peak amplifier having a first peak amplifier input terminal and a first peak amplifier output terminal; a second peak amplifier having a second peak amplifier input terminal and a second peak amplifier output terminal; an input impedance inverter; and an output impedance inverter; wherein one end of the input impedance inverter is connected to the carrier amplifier input terminal and is also connected to the combination amplifier input terminal, and another end of the input impedance inverter is connected to an input mid point to which the first peak amplifier input terminal and the second peak amplifier input terminal are connected; wherein one end of the output impedance inverter is connected to the carrier amplifier output terminal, and another end of the output impedance inverter is connected to an output mid point to which the first peak amplifier output terminal and the second peak amplifier output terminal are connected and is also connected to the combination amplifier output terminal, wherein an input signal applied at the combination amplifier input terminal is supplied to the carrier amplifier input terminal without phase shift, whereas the input signal supplied to the combination amplifier input terminal is provided to both the first peak amplifier input terminal and the second peak amplifier input terminal having a phase shift of 90°, and wherein a first bias voltage is applied to the first peak amplifier input terminal and a second bias voltage is applied to the second peak amplifier input terminal, and the second bias input voltage is greater than the first bias input voltage; wherein the carrier amplifier, the first peak amplifier, and the second peak amplifier are integrated on a common semiconductor substrate; and wherein a lateral dimension of the substrate is smaller than a wavelength of a signal applied to the combination amplifier input terminal.