Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1989-05-09
1990-06-05
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
307529, 455333, H03F 345, H04B 128
Patent
active
049317466
ABSTRACT:
A controllable broadband amplifier whose current consumption and direct voltage output level are independent of the control voltage includes four differential amplifiers, each having two input ports, two output ports, and a shared port. The two input ports of the first differential amplifier are connected to the two signal input ports of the broadband amplifier, the shared port of the first differential amplifier is connected to the power supply port via a constant current source, and the output ports of the first differential amplifier are connected to the shared ports of the second and third differential amplifiers. The input ports of the second and third differential amplifiers are connected together and to control voltage input ports of the broadband amplifier. One output port of the second differential amplifier is connected to one output port of the third differential amplifier, and both are connected to the shared port of the fourth differential amplifier. The remaining output ports of the second and third differential amplifiers are connected, at respective connection points, to the output ports of the fourth differential amplifier. The network which includes resistors is connected between these connection points, and the input ports of the fourth differential amplifier are connected to one another and to the network. One or both of the connection points can be employed as the signal output port of the broadband amplifier. The connection points are connected to another power supply port via resistors or a mixer stage.
Deckenbach Gottfried
Trankle Gunther
Licentia Patent-Verwaltungs-GmbH
Mullins James B.
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