Amplifier circuit having impedance matching circuit

Details Amplifier circuit having impedance matching circuit Amplifier circuit having impedance matching circuit

1994-09-20

1995-12-05

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330302, 333 33, H03F 360

Patent

active

054732816

ABSTRACT:
An amplifier circuit having an impedance matching circuit coupled between a transistor having an element impedance of Z.sub.Tr and a first transmission line having a characteristic impedance of Z.sub.0, the impedance matching circuit including a second transmission line having a characteristic impedance Z.sub.T0 .apprxeq.(Z.sub.Tr .times.Z.sub.0).sup.1/2 and a length of a quarter wavelength, and a high-harmonic processing circuit disposed at the connection of the second transmission line to the first transmission line. The high-harmonic component processing circuit has two parallel stubs each having a certain characteristic impedance and a released tip end, the two parallel stubs having length of one-eighth wavelength and one-twelfth wavelength, respectively.

REFERENCES:
patent: 5352990 (1994-10-01), Goto
patent: 5363060 (1994-11-01), Kohno

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