Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1997-03-12
1998-11-10
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330295, 330307, H03G 330, H03F 368
Patent
active
058349758
ABSTRACT:
An integrated, variable gain microwave frequency power amplifier comprises a number of individual amplifier stages which contain microwave frequency active devices. Each stage is fed with a common input signal, and the individual stage outputs are connected to respective micro-electromechanical (MEM) switches which, when closed, connect the individual outputs together to form the power amplifier's output. The power amplifier's gain is determined by the number of outputs connected together. The preferred switch provides low insertion loss and excellent electrical isolation, enabling a number of amplifier stages to be efficiently interconnected to provide a wide dynamic range power amplifier. The switches are preferably integrated on a common substrate with the active devices, eliminating the need for wire bonds and reducing parasitic capacitances. A variable impedance network comprising a number of impedance matching networks selected using MEM switches can be connected to and integrated with a variable gain power amplifier to provide impedance matching that is appropriate for each of the power amplifier's possible output power levels.
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Bartlett James L.
Chang Mau Chung F.
Higgins J. Aiden
Marcy, 5th Henry O.
Mehrotra Deepak
Mottola Steven
Rockwell Science Center LLC
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