Patent ID: 8237498
Filing Date: 2012-08-07
Classification: H03F

Abstract:
1. A Doherty amplifier system comprising: a substrate having a front surface and a back surface; a first Doherty amplifier to operate in a SISO communication mode and in a MIMO communication mode, the first Doherty amplifier comprising a first carrier amplifier and a first peak amplifier, each arranged on one of the surfaces of the substrate; and a second Doherty amplifier to operate in the MIMO communication mode but not to operate in the SISO communication mode, the second Doherty amplifier comprising a second carrier amplifier and a second peak amplifier, each arranged on one of the surfaces of the substrate, and wherein a distance between the first carrier amplifier and the second carrier amplifier is less than any of a distance between the first carrier amplifier and the first peak amplifier, a distance between the first carrier amplifier and the second peak amplifier, a distance between the second carrier amplifier and the first peak amplifier, and a distance between the second carrier amplifier and the second peak amplifier, a distance between the first peak amplifier and the second peak amplifier is less than any of the distance between the first carrier amplifier and the first peak amplifier, the distance between the first carrier amplifier and the second peak amplifier, the distance between the second carrier amplifier and the first peak amplifier, and the distance between the second carrier amplifier and the second peak amplifier, and in the SISO communication mode, heat generated by the first Doherty amplifier is conducted to the second Doherty amplifier to warm up the second Doherty amplifier which operates in the MIMO communication mode following the SISO communication mode.