High frequency power amplifier circuit, high frequency power amplifier electronic component and method thereof
View Patent ↗A high frequency power amplifier electronic component (RF power module) is so constituted as to apply bias to an amplifier FET in current mirror configuration. In this RF power module, deviation of a bias point due to the short channel effect of the FET is corrected, and variation in high frequency power amplifier characteristics is reduced. The high frequency power amplifier circuit (RF power module) is so constituted that the bias voltage for the amplifier transistor in a high frequency power amplifier circuit is supplied from a bias transistor connected with the amplifier transistor in current mirror configuration. In addition to a pad (external terminal) connected with the control terminal of the amplifier transistor, a second pad is provided which is connected with the control terminal of the bias transistor connected with the amplifier transistor in current mirror configuration.
1. A high frequency power amplifier amplifying high frequency signals, comprising:
an amplifying transistor for amplifying high frequency signals and whose output terminal is coupled to a first pad (P 1 ), whose control terminal is coupled to a second pad (P 2 ) and whose voltage source terminal receives a first source voltage and is coupled to a third pad (P 3 ); and
a bias circuit for generating a bias signal for the amplifying transistor and which includes a bias transistor whose bias output terminal is coupled to a fourth pad (P 2 ′), whose voltage supply terminal receives a higher voltage than the first source voltage and is coupled to a fifth pad (P 4 ), whose current adjusting terminal is coupled to a sixth pad (P 5 ) and whose voltage source terminal is coupled to the third pad (P 3 ).
2. The high frequency power amplifier circuit according to claim 1 ,
wherein the amplifying transistor and the bias transistor form a current mirror circuit via the second pad (P 2 ), the third pad (P 2 ′) and conductive elements which connect the first pad (P 2 ) and the second pad (P 2 ′).