Pulse electric power amplification apparatus

A pulse electric power amplification apparatus comprising:

• a first amplification device receiving a high frequency signal in an upstream stage in an initial stage unit and having a predetermined thermal time constant concerning an amplification gain, the first amplification device being a distributed amplification device;
• a second amplification device in a downstream stage cascade-connected to the first amplification device and having a thermal time constant different from that of the first amplification device, the second amplification device being a distributed amplification device;
• a final stage amplification device cascade-connected in a final stage downstream of the second amplification device;
• a drive amplification device cascade-connected in an upstream stage with respect to the final stage amplification device and driving the final stage amplification device;
• a power supply switching circuit receiving a pulse signal with which the high frequency signal is modulated and switching an output voltage given by a positive bias power supply, wherein the power supply switching circuit supplies the switched output voltage to positive bias power supply terminals at input sides of the first amplification device, the second amplification device, the drive amplification device, and the final stage amplification device;
• a first differentiating circuit receiving the pulse signal and having a time constant corresponding to the thermal time constant of the first amplification device;
• a second differentiating circuit receiving the pulse signal and having a time constant corresponding to thermal time constant of the second amplification device;
• a negative bias power supply outputting a negative bias voltage supplied to negative bias terminals at input sides of the drive circuit and the final stage amplification device;
• a first adding circuit adding the negative bias voltage given by the negative bias power supply and the output given by the first differentiating circuit and supplying a result to a negative bias terminal at an input side of the first amplification device;
• and
• a second adding circuit adding the negative bias voltage given by the negative bias power supply and the output given by the second differentiating circuit and supplying a result to a negative bias terminal at an input side of the second amplification device.