Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1991-04-05
1992-08-18
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330288, H03F 326
Patent
active
051402823
ABSTRACT:
A current amplifier arrangement in which a current-current converter (30) has an input connected to the input (33) of the current amplifier arrangement and a power supply input (34, 35) to which a current source (51-54) is connected a current mirror circuit (31, 32, 42, 44)has an input connected to the output (36-39) current converter and an output (46-49) connected to the output (50) of the current amplifier arrangement. The current converter includes a first output transistor (T1, T3) whose main current path is arranged between the input (33) and the output (37, 39) of the converter and whose base is connected to the power supply input (34, 36), and a diode-connected driver transistor (T2, T4) connected between the base of the first output transistor (T1, T3) and a node (K) which provides a reference potential during operation. The main current path of a second output transistor (T5, T6) is connected to the output of the arrangement and the base of this transistor is connected to said node. The driver transistor conducts as long as a part of the current supplied by the current source flows through the driver transistor and thereby keeps the second output transistor cut off. When the full current from the current source flows through the base of the first output transistor, the second output transistor can be turned on because the driver transistor is then not conductive. Then the second output transistor can also supply current to the output of the amplifier.
REFERENCES:
patent: 3852678 (1974-12-01), Frye
patent: 4394625 (1983-07-01), Sakai
Bierhoff Martinus P. M.
Van Mil Job F. P.
Franzblau Bernard
Mottola Steven
U.S. Philips Corporation
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