Microwave amplifier
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKazuhiko Nakahara, Yasushi Itoh
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Abstract
A microwave amplifier (10) of the present invention contains such an arrangement that both an inductor (12) and a resistor (13) are loaded in a parallel manner between a source electrode of a field-effect transistor (11) and the ground. Since the inductor (12) has a stray capacitance component (B), the inductor (12) is resonated at a resonant frequency “f0”. However, since the source electrode of the field-effect transistor (11) is grounded via a resistor (13) connected in parallel to the inductor (12), even when the inductor (12) is opened due to a resonant operation, the field-effect transistor (11) is operated under normal condition. As a result, the operation of the microwave amplifier (10) is stabilized.
Claims2
A microwave amplifier arranged by employing a field-effect transistor, wherein:
- a first inductor and a stabilizing circuit are loaded in a parallel manner between a source electrode of said field-effect transistor and ground;
- and
- said stabilizing circuit is equipped with a second inductor and a resistor series-connected to said second inductor, said second inductor is resonated at a frequency different from another frequency at which said first inductor is resonated by a stray capacitance component.
A microwave amplifier arranged by employing a field-effect transistor, wherein:
- a first inductor and a stabilizing circuit are loaded in a parallel manner between a source electrode of said field-effect transistor and ground;
- said stabilizing circuit is equipped with a resonant unit in which a second inductor is parallel-connected to a capacitor, and a resistor series-connected to said resonant unit;
- and
- said resonant unit is resonated at a frequency different from another frequency at which said first inductor is resonated by a stray capacitance component.
Dependencies are inferred from the claim text.