Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-04-15
1993-02-02
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, H03F 345
Patent
active
051840898
ABSTRACT:
A differential amplifier having output current limiting includes; first and second transistors (T.sub.1, T.sub.2) and first and second output terminals (1, 10) coupled to a first main electrode of the respective first and second transistors first current terminal (5) is coupled to a second current terminal (15) first and second diodes (D.sub.1, D.sub.2) have their anodes coupled to respective second main electrodes of the first and second transistors and their cathodes coupled to the first and second current terminals first and second current sources are coupled to the second main electrodes of the respective first and second transistors for applying first and second currents (I.sub.1, I.sub.2), to the first and second transistors. Third and fourth current sources are coupled to the first and second current terminals for applying third and fourth currents (I.sub.3, I.sub.4) to the first and second current terminals. Reference voltages are applied to the control electrodes of the first and second transistors. Fifth and sixth current sources apply to the first and second current terminals fifth and sixth currents (I.sub.5, I.sub.6 ) which are smaller than and opposite to the third and fourth currents. A third diode (D.sub.3) and a reverse fourth diode (D.sub.4) are arranged between the first and second current terminals. First and second signal current sources are coupled to the first and second current terminals for applying a first signal current (+I.sub.i) and a reverse second signal current (-I.sub.i) thereto. As a result of the signal current control on the current terminals the signal transmission from the current terminals (5, 15) to the output terminals is independent of the non-linear characteristic of the first and second transistors and the first and second diodes.
REFERENCES:
patent: 4479094 (1984-10-01), Harris
Franzblau Bernard
Mullins James B.
U.S. Philips Corporation
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