Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1997-10-09
2000-08-29
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
333 26, H03F 326
Patent
active
061114650
ABSTRACT:
An input transformer, used as a transmission-line transformer (11), is provided for connection between an unbalanced transmission line (10) and a balanced broadband amplifier (12), in which the input transformer has a fixed middle potential. The transmission-line transformer (11) converts an input signal into two output signals having opposite phase with respect to each other and which are supplied to the broadband amplifier (12). It is therefore possible to cancel secondary distortion in an amplifying unit. As the transmission-line transformer (11) a forced-balun type transmission-line transformer is used which has two input ports (P1, P2) and three output ports (P3, P4, P5), one (P4) of which is grounded. First and second two-wire parallel lines are arranged between the input ports and the output ports via a single glasses-shaped core. The input port and the two output ports have a respective impedance ratio of 1:(1/2):(1/2).
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Fukasawa Yoshiaki
Kakuta Yuji
Shirakawa Yasuhiro
Wakabayashi Yoshiaki
NEC Corporation
Nguyen Khanh Van
Pascal Robert
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