Microwave signal amplifier
AssigneeFujitsu Limited
InventorsNagahisa Furutani, Kazuo Takahara, Yoshikazu Doi, Haruo Yokouchi
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Abstract
A microwave signal amplifier comprising transistor having input and output terminals further includes input and output matching circuits connected to the input and output terminals, respectively, and corresponding bias supply circuits connected in parallel between said transistor and said input and output matching circuits, respectively. The input and output matching circuits are each implemented by high pass filters, and the bias supply circuits are each implemented by low pass filters. Furthermore, said high pass and low pass filters respectively have capacitors and inductors connected to the transistor, and said low pass filters have termination resistors.
Claims7
A microwave signal amplifier for amplifying a received line signal having predetermined band frequencies to produce an amplified signal output, comprising:
- a transistor having an input terminal and an output terminal;
- input matching means connected to said input terminal for applying said received line signal to said transistor, said transistor producing an amplified version thereof, said input matching means including a first high pass filter for filtering out low frequency components lower than the predetermined band frequencies and for making an open circuit to said low frequency components from the input terminal;
- output matching means connected to said output terminal for converting said amplified version into said amplified signal output, said output matching means including a second high pass filter for filtering out said low frequency components and for making an open circuit thereto from the output terminal;
- and
- bias supply means connected to said input and output terminals for supplying DC bias to said transistor, said bias supply means including a pair of low pass filters, each of said low pass filters being terminated by a termination resistor for blocking high frequency components higher than the predetermined band frequencies.
Dependencies are inferred from the claim text.