High power radio frequency cascode device

A cascode amplifier circuit, comprising:

• a first transistor comprising a first source/drain connected to ground, a gate connected to an input terminal, and a second source/drain;
• a second transistor comprising a first source/drain connected to the second source/drain of the first transistor, a second source/drain connected to an output terminal, and a gate;
• a first capacitor connected between the second source/drain and gate of the second transistor;
• and
• a second capacitor connected between the gate of the second transistor and the gate of the first transistor,
• wherein the gate of the second transistor is coupled to ground through a series resistor-capacitor network.

A cascode amplifier circuit, comprising:

• a first transistor comprising a first source/drain connected to ground, a gate connected to an input terminal, and a second source/drain;
• a second transistor comprising a first source/drain connected to the second source/drain of the first transistor, a second source/drain connected to an output terminal, and a gate;
• a power coupler comprising an input port connected to the input terminal, a first output port connected to the gate of the first transistor, and a second output port connected to the gate of the second transistor, the power coupler being configured to provide a first signal at the first output port and a second signal at the second output port, the first and second signals being respective portions of an input signal present at the input port;
• and
• an auxiliary amplifier having an input connected to the second output port of the power coupler and having an output connected to the gate of the second transistor.