Patent ID: 9306512
Filing Date: 2016-04-05
CPC Classification: H03F

Claim Text:
1. An amplitude shift keying (ASK) modulation amplifier circuit, comprising: a first amplifier to which a high frequency signal and a modulating signal are supplied, and that is configured to perform an amplification of the high frequency signal and an ASK modulation; a second amplifier to which an output of the first amplifier and the modulating signal are supplied, and that is configured to perform an amplification of the output signal from the first amplifier and an ASK modulation; a first control block that supplies the modulating signal together with a first bias current to the first amplifier; and a second control block that supplies the modulating signal together with a second bias current to the second amplifier, wherein the first amplifier comprises: wherein an amplification gain of the second amplifier is set higher than an amplification gain of the first amplifier.