High frequency power amplifier and wireless communication module
View Patent ↗The present invention provides a high frequency power amplifier of an open-loop type, which outputs a signal having a level corresponding to an output level required under control of a power supply voltage for each output power FET, based on a control signal for the output level. The high frequency power amplifier is provided with a bias voltage generating circuit which generates a gate bias voltage of each output power FET according to an output voltage of a power control circuit for controlling the power supply voltage for the output power FET, based on the control signal for the output level.
1. A high frequency power amplifier module, comprising:
a plurality of amplifying transistors which are coupled in cascade and amplify an input signal to provide an output signal;
a control circuit which receives a control signal that controls an output power of the output signal output from the plurality of amplifying transistors and which supplies a operation voltage to the plurality of amplifying transistors based on the control signal; and
a bias circuit which receives the operation voltage and supplies a bias signal to the plurality of amplifying transistors based on the operation voltage,
wherein the plurality of amplifying transistors, the control circuit and the bias circuit are mounted on an insulated board that includes a plurality of conductor layers and a plurality of dielectric layers each of which is provided between the conductor layers,
wherein levels of both of the operation voltage and the bias signal are reduced when the control signal instructs that the output power of the output signal output from the plurality of amplifying transistors is to be reduced, and
wherein levels of both of the operation voltage and the bias signal are increased when the control signal instructs that the output power of the output signal output from the plurality of amplifying transistors is to be increased.
2. A high frequency power amplifier module, comprising:
a first power amplifying system which includes a plurality of amplifying transistors which are coupled in cascade and amplify a first signal having a first frequency to provide a first output;
a second power amplifying system which includes a plurality of amplifying transistors which are coupled in a cascade and amplify a second signal having a second frequency different from the first frequency to provide a second output;
a control circuit which receives a control signal that controls a first output power of the first output signal output from the first power amplifying system and a second output power of the second output signal output from the second power amplifying system and which supplies an operation voltage to the first power amplifying system and the second power amplifying system based on the control signal; and
a bias circuit which receives the power supply voltage and supplies the bias signal to the first power amplifier system and the second power amplifying system based on the operation voltage,
wherein the first power amplifying system, the second power amplifying system, the control circuit and the bias circuit are mounted on an insulated board that includes a plurality of conductor layers and a plurality of dielectric layers each of which is provided between the conductor layers,
wherein levels of both of the operation voltage and the bias signal are reduced when the control signal instructs that the first output power and the second output power are to be reduced, and
wherein levels of both the operation voltage and the bias signal are increased when the control signal instructs that the first output power and the second output power are to be increased.
3. A high frequency power amplifier module according to claim 2 , comprising:
a select terminal which receives a select signal that indicates frequency bands for amplifying; and
a power amplifying system control circuit which includes the control circuit and the bias circuit and which is coupled to the select terminal and the first power amplifying system and the second power amplifying system,
wherein the power amplifying system control circuit activates the first power amplifying system or the second power amplifying system in accordance with the select signal.