High frequency amplifier with a guard circuit and a radio wave t

Details High frequency amplifier with a guard circuit and a radio wave t High frequency amplifier with a guard circuit and a radio wave t

1998-05-06

1999-11-23

Mottola, Steven J.

Amplifiers

Involving structure other than that of transformers per se

With printed circuits

330 68, 330286, 455124, H03F 360

Patent

active

059907363

ABSTRACT:
A high frequency power amplifier including: a multi-layer printed-circuit board, a transistor for amplifying an input signal and outputting the amplified signal, a first print circuit pattern for receiving the input signal and supplying the input signal to the transistor, a second print circuit pattern for supplying a supply voltage to the transistor, a ground terminal, and concentrated constant elements connected to the transistor on the multi-layer printed-circuit board is disclosed, wherein at least two layers of the multi-layer printed-circuit board are connected to the ground terminal, the first and second print circuit patterns are sandwiched on one layer of the multi-layer print circuit between the at least two layers, a first shielding circuit pattern, connected to the ground terminal, arranged around the first print circuit pattern on the one layer is further provided; and a second shielding circuit pattern, connected to the ground terminal, arranged around the second print circuit pattern on the one layer is further provided to provide isolation. Connection between the grounded layers or the first and second shielding circuit patterns and the ground terminal is provided with through holes or via holes. A transmission apparatus including the high frequency power amplifier is also disclosed.

REFERENCES:
patent: 5142239 (1992-08-01), Brayton et al.
patent: 5387888 (1995-02-01), Eda et al.
patent: 5768109 (1998-06-01), Gulick et al.
patent: 5886574 (1999-03-01), Mochizuchi

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