Power amplifier for broad band operation at frequencies above on

Details Power amplifier for broad band operation at frequencies above on Power amplifier for broad band operation at frequencies above on

1991-05-01

1992-05-05

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330307, 330295, H03F 360

Patent

active

051111578

ABSTRACT:
An octave band decade watt power amplifier is disclosed using compact and efficient MMIC fabrication techniques. The power amplifier is a two stage amplifier in which the driver transistor has two cells, and the power transistor has four cells, with each power cell double the size of the driver cells. Both transistors are of an optimized topology facilitating efficient broad band operation at matchable impedance levels. They are interconnected by three four section impedance matching networks of which the input network is coupled to a 50 ohm signal input terminal. The input and the interstage network are both formed on the same substrate as the transistors. The output network is formed on a separate substrate having a high dielectric constant (i.e. 37) which facilitates efficient and compact matching of four power transistor cells to a single output terminal for connection to a load at the conventional (50 ohm) impedance.

REFERENCES:
patent: 4543535 (1985-09-01), Ayasli
patent: 4788509 (1988-11-01), Bahl et al.

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