Amplifier circuit

An amplifier circuit comprising:

• an input terminal to which a high frequency signal is input;
• an output terminal configured to output an amplified high frequency signal;
• a first transistor having a first source terminal, a first drain terminal, and a first gate terminal, the high frequency signal being input to the first gate terminal via the input terminal;
• a second transistor having a second source terminal, a second drain terminal, and a second gate terminal, the high frequency signal being input to the second gate terminal via the input terminal, and the second transistor being coupled in parallel with the first transistor;
• a third transistor having a third source terminal coupled to the first drain terminal or the second drain terminal, a third drain terminal configured to output the amplified high frequency signal, and a third gate terminal that is grounded, the third transistor being cascode connected with the first transistor or the second transistor;
• and
• a feedback circuit configured to feed back the high frequency signal output from the second source terminal or the second drain terminal to the second gate terminal,
• wherein a ratio of a gate width of the second transistor W2 to a gate length of the second transistor L2 (W2/L2) is less than a ratio of a gate width of the first transistor W1 to a gate length of the first transistor L1 (W1/L1).